tabla – a pair of small drums attached together with one slightly larger than the other similar to bongos. They are used in Indian music and are played by striking with the hand and using pressure from the heel of the palm to vary the pitch.
tablature – a musical notation indicating the fingering on the frets of a stringed instrument. Called tab for short.
table of contents (TOC) – a track on a compact disc (CD) that contains information such as the number of tracks on the disc, their location, and their playing time. The TOC allows a CD player to quickly find and jump directly to a specific track.
tabletop – a format in which equipment or hardware is designed to sit on the flat surface of a desk or table, as opposed to being rackmounted. For example, many mixers and control surfaces come in tabletop format.
tail – the end of a song or audio file, as opposed to the top or head (beginning) of a song.
tailored frequency response – a significant departure from a flat frequency response, usually designed to enhance the sound for a particular application. Also called a shaped response or tailored response.
tails out – a method of winding recording tape onto a reel backwards so that the end of the tape (the tail) is on the outside and the the beginning is at the center of the reel. Tape stored in this configuration reduces the effects of print through. See also heads out.
take – (1) A single, continuous recording, either of several tracks at one time or of an overdub. Quite often during tracking, several takes of a performance are made, and the best one is kept. Sometimes the best parts of several takes are edited together to create the best composite take. (2) See playlist, definition #3.
take notation – the writing down of details and comments regarding a take on a take sheet.
take number – (1) Before digital recording became common, it was not unusual to record many takes before obtaining an acceptable performance. These takes were usually numbered. (2) During much of the era of the 78-rpm record, before recording tape came into common use, recordings were cut directly to disc. Therefore, a new pressing would require a new take, and take numbers would be included in the matrix area.
take sheet – a form on which an engineer writes information and comments about each take.
talkbox – a guitar effects device that allows the human voice to modulate the guitar signal.
talkover – (1) A switch on radio station control boards and DJmixers that automatically ducks the music allowing the DJ to speak over it. (2) The act of speaking while music or other program material is playing in the background.
tangency – the alignment of the headgap with the wrap of the recording tape on a tape machine. The tape should contact the head the same amount on either side of the gap. Poor tangency leads to uneven head wear.
tangential mode – one of the three room modes in which resonance in a room is caused by sound reflecting off any two pair of opposite surfaces. The other two modes are axial mode and oblique mode.
tape – (1) Short for magnetic recording tape. (2) To record music or other programs even if the storage medium is not magnetic tape. (3) A strip made of rubber, cloth, vinyl, and other materials with adhesive applied to the back, usually coiled into rolls, such as adhesive tape or gaffer's tape.
tape base – the thin ribbon of material that supports the magnetic layer of magnetic recording tapes. Early formulations of recording tape used cellulose acetate, but this material became brittle with age. For a short time, polyvinyl chloride (PVC) was used. Since the 1960s, the prevalent material has been polyester, which also goes by the Dupont trademark, Mylar®. The problem with tape made with a polyester base is that a tape pack wound too tightly can stress the tape, while too loosely can result in nonlinear deformation, causing playback distortion. When the temperature or humidity changes, the tape pack will undergo expansion or contraction that can distort the tape backing. To reduce these problems, magnetic tape should be stored in an environment with a stable temperature and humidity. Also called substrate, backing film, support film, tape backing, or carrier.
tape bias – two processes used to improve the fidelity of analog audio recordings on magnetic tape: dc bias and ac bias. Magnetic tape has a nonlinear response, especially at low signal levels, and bias pushes the signal into a more linear zone of the tape resulting in lower distortion. DC bias, which was used on some early tape recorders and later on some inexpensive cassette recorders, was the addition of a direct current to an audio signal. The main disadvantage of dc bias was that it increased the noise level on playback. AC bias is the primary method of reducing distortion on later model tape machines. It consists of an ultrasonic signal (typically between 40 to 150 kHz) that is added to an audio signal. The bias is designated as “normal” or “high,” depending upon the type of tape being used. Some tape machines provide for adjustable bias. As bias is reduced, there is more high frequency headroom, but dynamic range is reduced, distortion increases, and the saturation level is reduced. See also hysteresis.
tape cartridge – a loop of recording tape contained in a plastic housing once used in broadcast studios for playing short messages and commercials (see Fidelipac) or in consumer playback units to play music (see 4-track and 8-track cartridges). Called a cart for short.
tape delay – a delay created using a tape recorder to produce what is called a slapback echo or slapback delay. Originally, some of the signal from the playback head would be mixed back into the signal going to the record head. Because the record and playback heads on a typical Ampex recorder were 2.58 inches (6.55 cm) apart, a delay of 172 ms was produced when using a tape speed of 15 ips. Later, special units were devised that used a tape loop to feed the signal back into the recording. These devices allowed the operator to vary the tape speed and thereby adjust the time between echoes. Legend has it that Sam Phillips, owner of the legendary Sun Studio, discovered tape echo by mistake. While using a reel-to-reel recorder he accidentally fed the playback signal back into the recorded signal. Whether or not that is true, he made the effect famous. Sometimes called a tape echo.
tape head cleaner – a solvent for cleaning the record and playback heads, rollers, and tape guides on tape machines and video recorders. Solvents include alcohol (usually isopropyl alcohol) and amyl nitrite (available commercially as a video head cleaner). Acetone is not recommended as it can damage plastic parts, and Freon was discontinued in 1995 due to damage to the ozone layer.
tape machine – a device for recording and playing back audio on magnetic recording tape. Also called a tape recorder or tape deck.
tape noise – the noise that is specifically due to the recording tape itself. There are several types of tape noise: (a) bulk-erased noise, the noise caused by bulk-erasing a tape, (b) zero-modulation noise, the noise present when no signal is recorded (typically 3 to 4 dB higher than the bulk-erased noise), (c) bias-induced noise, the difference between bulk-erased and zero-modulation noise, (d) saturation noise, the noise that occurs when reproducing a uniformly saturated tape caused by imperfect particle dispersion (typically 15 dB higher than the bulk-erased noise), (e) dc noise, the noise that occurs when playing a tape that has been non-uniformly magnetized (due to surface irregularities and asperities) with direct current going to the record head (which can be as much as 20 dB higher than bulk-erased noise), and (f) modulation noise, the noise due to variations in the signal output caused by poor particle dispersion and surface asperities. See also system noise and equipment noise.
tape operator – an assistant who loads, unloads, and operates a tape machine.
tape platter – one of two round discs found on a tape machine that holds the tape reels in place, with one being the supply platter and the other the take-up platter. Also called a tape disc or tape turntable. See tape machine for diagram.
taper – (1) Fans who record concerts from the audience. Although the practice was originally illegal and was used to produce “bootleg” recordings, the practice became acceptable when some bands, notably the Grateful Dead, began encouring the practice. (2) The way in which the resistance varies as the armature (wiper) of a potentiometer (pot) is rotated (or moved if a slider). There are many tapers, but only two main ones: A linear taper (called a B-taper in the US and Asia or A-taper in Europe) is one in which the resistance varies linearly as the wiper moves. A logarithmic (log) taper is one in which the resistance varies logarithmically as the wiper is moved. It is also called an audio taper as it is most commonly used for audio volume controls, because the ear responds logarithmically to increases in sound levels. It is designated as an A-taper in the US and Asia, but a B-taper in Europe, and sometimes called a D-taper.
The reverse logarithmic taper is sometimes called an anti-log taper, a reverse audio taper, or an RD-taper (for reversed D-taper), but is usually designated as a C-taper. The MN taper (called a balance pot) is a special taper developed for home stereo balance controls, consisting of two sections (one for each channel) operating in opposite directions, with the first half of travel of each section having zero resistance and the second half being a linear taper. There are several other less common versions such as E-, G-, K-, S-, and W-tapers. Because of the confusion with the letter designations, it is best to refer to these by their name or function. Taper is also called potentiometer law.
tape recording – (1) The process of storing audio signals on a magnetic recording tape for subsequent reproduction or broadcast. (2) A broadcast or performance recorded on magnetic tape. (3) A tape on which sounds have been recorded.
tape reel – the spool onto which magnetic recording tape is wound. Reels come in diameters of 3 inches, 5 inches, 7 inches, and 10½ inches for use with various widths of tape. Reels of 7-inches and smaller fit onto splined ¼-inch shaft known as a cine spindle. NAB reels (10½-inch metal reels) used an NAB hub. See tape machine for diagram.
tape return – an input to a mixer from a multitracktape recorder, which differs from a normal input in that it is switchable between monitor and mixdown functions, depending on whether the recorder is in recording or mixing mode.
tape speed – the speed at which recording tape passes over the heads of a tape machine, measured in inches per second (ips) or, less commonly, centimeters per second (cm/s). Early professional audio tape machines used ¼-inch wide tape on 10½-inch reels, holding a total of 2400 feet (730 meters) of recording tape, which at 15 ips yielded 30 minutes of recording time. Eventually a number of standard tape speed were adopted. For professional audio recording tape speeds were 30 and 15 ips (38.1 and 76.2 cm/s). For consumer tape recorders, 7½ and 3¾ ips (19.05 and 9.53 cm/s) were used with 7½ ips (19.05 cm/s) being used for prerecorded audiophile tapes. Cassette tapes used a tape speed of 1⅞ ips (4.76 cm/s). Even 15⁄16 ips (2.38 cm/s) was used for voice, dictation, and other applications requiring very long recording times, such as logging police and fire dispatch calls. As tape speed increases, the high frequencyresponse increases, bass response decreases, dynamic range increases, noise decreases, wow and flutter improves slightly, and the center frequency of head bump increases. For most tape machines, head bump is most prominent at 15 ips.
tape type – a category for magnetic recording tape formulations as designated by IEC standard 60094: Type I (ferric oxide), Type II (chromium dioxide or cobalt-doped ferric oxide), Type III (ferrichrome or ferrochrome [one layer of ferric oxide and one layer of chromium dioxide], now obsolete), and Type IV (metal). Type I uses normal bias and a 100-μs EQ, while Types II-IV use a high bias and a 70-μs EQ.
tape warble – variations in the pitch caused by fluctuation of the tape speed during recording or playback of a recording tape.
tape weave – the slow side to side movement of recording tape as it passes over the heads, causing drop outs. Tape weave can be due to defects in manufacturing of the tape or to damaged or worn tape guides.
tap tempo – a function found on some DAWs and other devices that allows the user to set a tempo or a rate for a time-based effect (such as delay) by pressing a key, button, or other control several times in a row at the desired tempo, as opposed to entering a value manually.
target loudness level – the intended loudness level for a program using the ITU BS.1770 standard. EBU R128 specifies a target loudness level of -23 LUFS, while ATSC A/85 specifies -24 LKFS. Sometimes called a target level, target loudness, or target for short.
TDIF – Tascam Digital Interface Format. An eight-channeldigitalaudio interface developed by Tascam (a division of Teac) that uses unbalanced signal transmission and a DB-25 type connector. TDIF and ADAT optical are the two major formats for the simultaneous digital transfer of multiple audio tracks using a single cable.
TDK Corporation – a company founded in Tokyo, Japan in 1935 to manufacture magnetic ferrite. Today it manufactures electronics, electronic components, and recording and data-storage media. TDK is the acronym of the original Japanese name of the company, Tokyo Denkikagaku Kogyo, (Tokyo Electronics and Chemicals), which later became TDK Electronics Co., Ltd. In 1952, TDK began manufacturing magnetic recording tape and in 1966 cassette tapes. It began withdrawing the production of cassesttes in 1997. Now its line of magnetic and optical media, including USB flash drives is made under license to Imation.
TDM – Time Division Multiplexing. A time-sharing technique that provides for the simultaneous transmission of multiple signals over a single path. Avid used this technique to leverage the power of computers for its plug-ins with Pro Tools HD systems. It is now being phased out, being replaced by AAX DSP.
TEAC Corporation – an electronics company based in Japan, founded in 1953 as the Tokyo Television Acoustic Company. TEAC has four divisions: (1) TASCAM, which produces primarily audio recording products from consumer to professional quality, (2) ESOTERIC, which make high-end consumer audio products, (3) TEAC Consumer Electronics, which manufactures mass-market audio products, such as CD players, turntables and amplifiers, and (4) Data Storage and Disk Publishing Products, with products such as computer drives, CD and DVD recorders, and other storage products. In 2003, a majority interest in Teac was acquired by Gibson.
tebi – one of the new binary prefixes approved by the IEC and used to distinguish between binary and decimal prefixes, i.e. tebi represents 1,099,511,627,776 = 240 versus tera which represents 1,000,000,000,000 = 1012. For example, you would use 24 gibibits, abbreviated 24 Gib, or 24 gigabits, abbreviated 24 Gb.
TechAmerica – a trade organization for the high-tech industry headquartered in Washington, DC. It was formed in 2009 from the merger of America Electronics Association (AeA), the Cyber Security Industry Alliance (CSIA), the Government Electronics & Information Technology Association (GEIA), and the Information Technology Association of America (ITAA). In 2014, TechAmerica was acquired by the Computing Technology Industry Association (CompTIA), a non-profit trade association, which was created in 1982 as the Association of Better Computer Dealers (ABCD). AeA was founded in 1943 as the West Coast Electronics Manufacturing Association (WCEMA). In 1969, WCEMA became the Western Electronic Manufacturers Association (WEMA), which was renamed in 1977 to the American Electronics Association (AeA). The Information Technology Association of America (ITAA) was organized in 1960 as the Data Actuating Technical Association (DATA). In 1961, it evolved into the Association of Data Processing Service Organizations (ADAPSO). ADAPSO was renamed ITAA in 1991. In 2008 ITAA merged with the Government Electronics and Information Technology Association (GEIA), but retained the ITAA name. The GEIA had been an affiliate of the Electronic Industries Alliance (EIA), which ceased operations in 2011.
Technicolor SA – a company headquartered in Issy-les-Moulineaux, France, that provides provides services and products for the communication, media and entertainment industries. Technicolor is a trademark for a film color process invented in 1916 by Technicolor Motion Picture Corporation, a subsidiary of Technicolor, Inc., now a division of Technicolor SA. Technicolor was later bought by the French company Thomson, who changed its name to Technicolor SA in 2010, with the US subsidiary becoming Technicolor USA, Inc.
TE Connectivity, Ltd – a company headquarted in Schaffhausen, Switzerland, that designs and manufactures connectors and sensors for a variety of industries including automotive, data communications, aerospace, defense, energy, and consumer electronics. It was created in 2007, when Tyco International was split into three parts, one of which was Tyco Electronics, Ltd. In 2011, it became TE Connectivity,
telecine – (1) The process of transferring motion picturefilm into video. (2) The equipment that converts a motion picture, captured originally on film stock, into video. Abbreviated as TK, since TC is used to refer to timecode.
Telecommunications Industry Association (TIA) – an organization created in 1988 when the U. S. Telecommunications Suppliers Association (USTSA) merged with the Information and Telecommunications Technologies Group of EIA (EIA/ITG). The TIA works with the EIA to develope technical standards and to collect market data for the telecommunication industry.
Telefunken – an electronics company, founded in Berlin, Germany, in 1903 as a joint venture of Siemens & Halske and AEG (Allgemeine Elektricitäts-Gesellschaft), creating Gesellschaft für drahtlose Telegraphie System Telefunken (The Company for Wireless Telegraphy, Ltd.). The joint venture was a compromise solution to a dispute over radio transmitter patents. Since then, Telefunken has operated under various versions of the name. Its product line has included radio transmitters, vacuum tubes, home electronics, appliances, and many others. During the 1940s and 1950s, Telefunken sold and distributed several microphones under its name for other companies such as Neumann and AKG, but they never manufactured any microphones during that period. Telefunken USA was formed in 2001 to repair and restore vintage Telefunken microphones, as well aS the buiding of reproductions. In 2009, Telefunken USA was renamed Telefunken Elektroakustik, and was given the exclusive rights to manufacture vacuum tubes and professional audio products under the Telefunken trademark in over 27 countries. Sometimes called by the nickname T-Funk.
telephone filter – an equalization curve designed to simulate the sound of a voice on a telephone by removing frequencies below 300 Hz and above 3,000 Hz.
telescoping shield – a configuration of a balanced cable in which the shield is connected only at one end. Shielding does not necessarily have to be connected a both ends to be effective. Typically the shield is left unconnected at the source, but some engineers prefer to disconnect the other end. The end left unconnected is said to be floating.
Teletronix Engineering Company – a company founded by James F. Lawrence II in Pasadena, California in the early 1960s. In 1965 Teletronix was sold to Babcock Electronics of Costa Mesa, California. In 1967 United Recording Electronics Industries (UREI), purchased the broadcast division from Babcock, which included the Teletronix brand. UREI also had acquired National Intertel, which became the Teletronix division. See Universal Audio for more details.
Teletronix® LA-2A Leveling Amplifier – a leveler designed by James F. Lawrence II, founder of the Teletronix Engineering Company, and introduced in 1965. Lawrence created the first leveling amplifier utilizing optical sensors, by combining a luminescent panel with photo resistors (the impedance of which changes with light intensity) inside a vacuum-tube-sized metal tube. This optical attenuator produces a gentle, program-dependent optical compression, still revered by audio professionals. The LA-2A went out of production in 1969, returning for a couple of short production runs before being reissued by Universal Audio in 2000. The LA-2A was inducted into the TECnology Hall of Fame in 2004.
television – (1) The broadcasting of pictures and sound using radio waves. Also called TV (US) or telly (UK). (2) A television set. (3) The television broadcasting industry and/or television media.
television-band device (TVBD) – an unlicensed radio frequency device that operates in the vacant channels or white spaces between US television channels in the range of 54 to 698 MHz. Also called a TV-band device or white space device.
television interference (TVI) – a type of RFI that interferes with the transmission and reception of television signals. Both natural and man-made phenomena can disrupt the reception of television signals, including lightning and spark-generating equipment.
television station – an installation or organization used for the production and transmission of televisionbroadcasts.
Telex Communications, Inc. – a manufacturer of hearing aids and audio equipment based in Burnsville, Minnesota, originally known as the Telex Corporation. In the 1970s it became Telex Communications, a subsidiary of Telex Corporation. In 1988, Telex was acquired by Memorex, and became Memorex Telex NV. In 1989 it was spun off as an independent company. It merged with Electro-Voice in 1998. In 2006, the company was acquired by the Bosch Group and became Bosch Communications Systems.
template – a DAWsession file or project file that is pre-loaded with setups and configurations for a specific situation, but contains no audio or MIDI data. They are usually customizable and can be saved for a variety of situations to save time when creating new sessions. Also called a session template or project template.
temporal blurring – the smearing of transient information over time caused by digitalfilters. Temporal blurring affects the timing precision of sound. Also called temporal blur.
temporal masking – a condition in which a low level sound will not be perceived by the ear when it is adjacent to a much louder sound. If the loud sound precedes the soft sound, it is called forward masking. If reverse, it is called backward masking. Temporal masking can be used in the data compression of audio files using perceptual coding. Also called time masking or background masking.
temporary threshold shift (TTS) – an upward shift in the threshold of human hearing, which usually occurs as a means for the ear to protect itself when subjected to loud sound.
tenor – (1) One of the highest vocal range of the adult male voice, usually a range from the C one octave below middle C to about A above Middle C (C3 to A4). (2) The musical range between alto and baritone. (3) A singer whose voice is within this range. (4) A musical instrument that plays within this range. (5) A vocal or instrumental part written in this range.
tenor clef – the symbol on a music staff indicating that the fourth line from the bottom of a staff represents the pitch of middle C. It is one of five C clefs and is used for writing music for the bassoon, cello, or tenor trombone.
tension rod – a bolt on a drum that goes through the holes in the rim and screws into a threaded lug attached to the drum shell used to to tighten and tune the drumhead.
tenuto – a notation that indicates a music note should be held for longer than its normal value, shown by a short, heavy line above or below the note.
tera- (T) – the SI prefix for a factor of one quadrillion, 1,000,000,000,000 or (1012).
terminal strip – a series of connectors, often made up of screw connections, arranged in a line used to permanently connect a number of lines between audio devices. Sometimes called a terminal block, terminal board, or barrier strip.
terminate – (1) To make a connection where a signal enters or exits an audio device. (2) A connection where an amplifier feeds a resistance that matches its impedance.
tessitura – (1) The most musically acceptable and comfortable range for a given singer or musical instrument. (2) In musical notation, the range for a given piece of music, which is not determined by the extremes of its range, but by which part of the range is used most.
Texas Instruments, Inc. (TI) – an electronics company founded in 1951, and headquartered in Dallas, Texas, that designs and manufactures semiconductors and other products such as, calculators, microcontrollers, multi-core processors, and digital signal processors (DSPs).
theater – (1) A building, part of a building, or an outdoor area for the presentation of motion pictures (movie theater, dramatic presentations, or stage entertainment. See also home theater. (3) Dramatic arts as performances or a profession.
theremin – an early electronic musical instrument invented in 1928 by Russian inventor Leon Theremin. It consists of two metal antennas that sense the relative position of the performer's hands. The frequency is controlled by one hand and amplitude with the other without physical contact. The electronic signals are amplified and sent to a loudspeaker. Originally called an aetherphone, etherphone, thereminophone, termenvox, or thereminvox.
thermal – pertaining or relating to heat.
thermal equilibrium – the state in which electronic equipment has reached a steady, constant operating temperature for the environment it is in. Most audio equipment reaches thermal equilibrium in about ten minutes. During the startup/warmup period, swings in voltage, current, and temperature may occur and the equipment may not be operating at optimum performance.
thermal noise – the electronic noise caused by the thermal excitation of electrons in an electrical conductor, which occurs even when no voltage is applied. Also called Johnson noise, Nyquist noise, or Johnson-Nyquist noise.
thin – a descriptive term for a sound that is lacking in fundamentals as compared to harmonics, especially in the low end. Opposite of full or rich.
third – in music, the interval that includes three positions on the music staff. (See interval number.) A major third has a theoretical ratio of 5:4. However, in the equal temperament system, in which the notes are spaced equally, the ratio from middle C (262.63 Hz) to E4 (329.63 Hz) is 5:4.016, or about 14 cents wider than the 5:4 ratio. While a major third has an interval of four semitones, a minor third has an interval of three semitones, a diminished third has two semitones, and an augmented third has five.
third-octave – frequencies spaced every three octaves apart. For example, the third-octave above 1 kHz is 8 kHz. It should not be confused with one-third octave.
Thomson, Inc. – a company headquartered in Issy-les-Moulineaux, France, that provided provides services and products for the communication, media, and entertainment industries. In 2010, the company changed its name to Technicolor SA, after its American film technology subsidiary, with the US subsidiary becoming Technicolor USA, Inc. Formerly known as Thomson Consumer Electronics or Thomson Multimedia, the company has existed under several names, including Compagnie Francaise Thomson-Houston (CFTH), Thomson-Houston-Hotchkiss-Brandt, Thomson-Brandt, and Thomson-CSF. In 1988, Thomson bought the rights from GE to make and sell RCA, ProScan, and GE-branded televisions and other consumer electronics products. In 2004, Thomson formed TTE, a joint venture with China's TCL, allowing TCL to manufacture RCA and Thomson television and DVD products, although Thomson continued to control those brands, licensing them to TTE. In 2010, Thomson sold the RCA brand to ON Corporation.
three-channel stereo – an early version of stereophonic sound developed in 1933 that had three separate channels, designed to be reproduced with three speakers (left, center, and right). Also called three-track stereo.
three-point edit – an audio edit in which the the beginning and ending points of the source audio are specified and only the beginning of the insert point (on the same or a different track) is specified. Typically, 3-point edits are used to insert new material into an existing track, with the material at the insert point either being replaced or pushed farther back in the time line. See also four-point edit and replace edit.
threshold of feeling – the sound level at which a person can feel sound vibrations on the skin. This varies with frequency and decreases sharply for frequencies above 1000 Hz. This is the way that deaf people are able to perceive music.
threshold of hearing – the lowest sound level detectable by a person with good hearing, defined as 0 dB-SPL or 20 μPa. Also called the threshold of audibility.
threshold of pain – the sound level at which a person begins to experience pain, typically in the range of 120 to 140 dB-SPL.
Thunderbolt™ – an interface standard developed by Intel and released in 2011 that provides a means of connecting external peripherals to a computer. Using the same connector as a Mini DisplayPort (MDP), it combines a PCI Express (PCIe) and a DisplayPort (DP) into one serial signal along with a dcpower connection. Thunderbolt 2 provides the same 20 Gbps as Thunderbolt 1 but does so over a single channel, rather than 10 Gbps on two channels as with Thunderbolt 1. Thunderbolt 3 uses a USB-C connector with a bandwidth of up to 40 Gbps, uses half the power consumption of Thunderbolt 1 and 2, and provides up to 100 watts of power. hunderbolt 3 can connect not only to Thunderbolt-aware devices but also to older protocols, such as HDMI and FireWire using adapters. Thunderbolt 3 can also connect to USB devices. See also USB PD.
THX, Ltd. – a company founded in 1983 by George Lucas and headquartered in San Francisco, California, that develops the THX reproduction standards for movietheaters, screening rooms, home theaters, computerspeakers, gaming consoles, car audio systems, and video games. Originally a subsidiary of Lucasfilms, Ltd., it was acquired by Creative Technology in 2002. In 2016, THX was acquired by videogame hardware company Razer, Inc.
tie – a musical symbol consisting of a curved line used to join together two notes of the same pitch to combine their durations. It is similar to the slur, which is used to join together notes of different pitches to indicate a smooth transition from one note to the other.
tie line – a cable used to connect to one or more locations, such as between the studio and the control room.
tight – (1) A descriptive term for a sound that is well damped with rapid decay. (2) A recording made using close miking with the instruments well isolated. Also called tight miking. (3) Well synchronized playing of instruments.
tilt equalization (EQ) – an equalization scheme consisting of an upper shelf and lower shelf meeting at an axis point or pivot point. When the upper shelf is boosted, the lower shelf is cut by the same amount and vice versa. So one control will cut the lows and boost the highs or cut the highs and boost the lows equally.
timbre – (1) The quality that defines the sound that an instrument makes—what makes one instrument sound different from another even when playing the same note. Timbre is primarily determined by the harmonic content and the dynamic characteristics of the sound, as demonstrated with an ADSRenvelope. (2) The overall sound quality of a loudspeaker system. For example, some speakers have a warm timbre while others have a bright timbre. In a surround sound system all speakers should have a close timbral match for the best performance and sonic realism. Pronounced “tam-ber.”
timecode address – a specific reference or point in a time code, expressed in hours:minutes:seconds:frames.
timecode generation – the process of creating a new time code.
time-coherent – the character of a loudspeaker in which all audible frequencies reach the ear of the listener at the same time. However, most crossovers create a small amount of delay so that the sound from each driver arrives at slightly different times, causing a phase-shift. There is some debate as to the importance of time-coherence, especially since as the crossover cutoff slope increases, it decreases the amount signal going to the wrong driver, but also increases the delay. Also called time-aligned, phase-coherent, or minimum-phase speaker design.
time constant (τ) – (1) The time representing the speed with which a particular system can respond to change. For example, for an RC circuit, it is equal to the product of the resistance (in ohms) and the capacitance (in farads) of the circuit, or τ = R × C. (2) An RC circuit also acts as a lowpass filter and can be used to filter out high-frequencynoise. The formula for a filter cutoff frequency (fc) is fc = 1/(2 × π × τ). The higher the value of time constant, the lower the corner frequency. Also called an RC time constant. Some common time constants found in audio applications are shown in the table below:
Time Constant (μs)
Cutoff Frequency (Hz)
Dolby-based FM de-emphasis
Type 1 (Normal Bias) Cassette Tape EQ
Standard FM Broadcast de-emphasis
Type 2 (High Bias) Cassette Tape EQ
time delay – (1) The interval of time between two events. (2) The amount of time required for a signal to pass through a circuit, process, device, or medium. (3) The amount of time between the sending and receiving a signal. (4) The amount of time between applying power to a circuit or device and when it begins to operate. Also called timing delay, time lag or lag time.
time-difference stereo – using two microphones spaced at some distance apart so that time of arrival provides the primary stereo information. Also called time-of-arrival stereo or difference-in-time stereo. See intensity stereo and stereo microphone techniques.
time domain – time used as an independent variable in the analysis or measurement of time-dependent systems, functions, or signals. For example, a time-domain graph shows how a signal changes over time. See also frequency domain.
Time-Sensitive Networking (TSN) – a set of technical standards developed by the IEEE Time-Sensitive Networking Task Group (formerly the Audio Video Bridging Task Group) of the IEEE 802.1 standards committee, that provides specifications to allow time-synchronized low-latency audio and video streaming services through IEEE 802 networks. See also Audio Video Bridging.
time signature – a musical notation written as a fraction on the musical staff in which the numerator specifies the number of beats in a measure and the denominator specifies what note equals one beat. For example, 3/4 time indicates there are 3 beats per measure and a quarter note equals one beat. Also called meter signature, metre signature, bar signature, or measure signature.
timing tape – leader tape with markings every 7½ inches used to make precise, timed edits between selections.
timpani – a set of tunable drums consisting of a skin stretched over a large bowl usually made of copper, played by striking the head with a special stick or mallet, and often used in orchestras. Although timpani is plural, the singular timpano is rarely used, but they are often incorrectly called timpanis. They are also called kettledrums. Sometimes spelled tympani
tinnitus – a medical term for the perception of sound occurring when no external stimulus is present. Although it is often called “ringing in the ears,” it is sometimes perceived as hissing, roaring, whistling, chirping, or clicking. While the cause is unknown, several conditions are known contributors including exposure to loud noises, wax build-up in the ears, some medications, infections of the ear or sinus cavities, and head or neck injuries.
tinny – a descriptive term for a sound with weak lows, boosted midrange , and very little upper frequencies upper frequencies, sounding like it came from a tin can or a telephone.
Tiny Telephone™ (TT) – a trademark of Switchcraft for a mid-sized phone plug that is 0.173 in (4.40 mm) in diameter (smaller than the ¼-inch phone plug, but larger than the 3.5 mm miniature plug). It is avalaible in both TS and TRS versions. Although they cannot handle as much power and are less reliable than a ¼-in plugs, they are sometimes used in studio patchbays and live sound applications to save space. Also known as a bantam jack.
TLA – (1) Transformer-Like Amplifier. A Rupert Neve design for a microphonepreamplifier with lower distortion. (2) Three Letter Acronym. The origin of the term TLA is unsure, but some say it was invented by NASA.
tom-tom – a cylindrical drum with no snare that is typically tuned to a certain pitch and may have heads on one or both ends. They come in a wide range of sizes for various pitches as well as mounting options, such as a rack tom and a floor tom. Called a tom for short.
tonal – (1) Pertaining to tone. (2) Music having an established key. The opposite of atonal.
tonal balance – (1) The volume relationships between different regions of the audio spectrum. (2) Having equal levels across the entire audio spectrum. (3) The degree to which one band of the audio spectrum is emphasized more than the others, typically described with terms such as warm, dark, or bright.
tonewheel – a device used to generate musical tones in instruments such as electronic organs. It was invented about 1910 by the German engineer Rudolph Goldschmidt (not by Laurens Hammond as some claim). A tonewheel consists of an electric motor that rotates a series of metal disks, with each disk having a given number of notches or bumps on the rim. As these disks rotate within a magnetic field, they cause fluctuations in the magnetic field and generate a signal whose frequency depends on the rotation speed and the number of bumps. The signal is amplified to drive a loudspeaker. Sometimes called a tonewheel generator. Also spelled tone wheel.
top – (1) The beginning of a song or audio file, as opposed to the tail or ending. Also called the head. (2) The front face of a guitar body. The top of an electric guitar may have a separate layer of wood (called a cap) most commonly made of maple. The cap contributes brightness to the tone of the guitar. The top of an acoustic guitar consists of a thin sheet of solid or laminated wood that resonates with the strings providing the primary tone of the guitar. Spruce, cedar, and other woods are commonly used for the top. Caps are not used on acoustics because they inhibit the resonance, causing a duller tone. Tops can be flat (flat-top guitar) or curved (archtop guitar).
topping and tailing – the process of removing silence or extraneous sounds at the beginning (top or head) and end (tail) of a song in preparation for creating a master. In some cases this process may involve adding a fade in or fade out.
toroidal polar pattern – a microphonepolar pattern shaped like a doughnut. In mathematics, a toroid is a surface of revolution with a hole in the middle, like a doughnut. If the surface that is rotated is a rectangle, it produces a hollow rectanglar ring. A revolved circle produces a doughnut-shaped object called a torus. Such a polar pattern is useful in teleconferences where it more sensitive to participants gathered around a conference table than the noise coming from the center of the ring, such as projectors and other equipment. Also called a toroid polar pattern.
torr – a unit of atmospheric pressure equal to the pressure that will cause a column of mercury (Hg) in a barometer to rise to a height of 1 mm. This was formerly indicated as 1 mm Hg, but has been replaced by the torr, named after Evangelista Torricelli, the Italian physicist who invented the barometer. One atmosphere equals 760 torr or 14.696 psi.
Toshiba Corporation – a multinational engineering and electronics corporation headquartered in Tokyo, Japan, that produces communications equipment, electronic components, power systems, household appliances, medical equipment, office equipment, and other products.
TOSlink – Toshiba link. The digital communication standard developed by Toshiba that sends S/PDIF-formatted data over an optical cable for use with consumer and semi-pro equipment. The original S/PDIF connection used copper cables. Officially known as EIAJ Optical Standard.
total harmonic distortion plus noise (THD+N) – a measurement taken by inputting a sine wave into a device, notch filtering the output, and comparing the ratio between the output signal with and without the sine wave. This measurement is more comparable between devices than THD.
T-pad – a type of electronic attenuator circuit with a schematic in the shape of the letter “T.” A T-pad maintains a constant impedance on both the input and output as the attenuation is changed. An L-pad holds either the input or the output impedance constant. An H-pad performs the same function as a T-pad, except it is designed for balanced lines. All three attenuate signals independent of the frequency. They are called pads because they “pad” down the signal analogous to acoustics. Also spelled T pad.
track – (1) To record the individual channels of a multitrack recording. (2) To be controlled by or follow another signal proportionally. (3) A path or lane on a magnetic recording tape containing a single channel of audio. Also called a channel. (4) An individual recording of one instrumental or vocal performance on a digital audio workstation, analogous to a tape track. (5) A sequence of controls in a sequencer, analogous to a track in a multitrack recording. (6) The finished mixed down stereo or mono recording. An album typically contains 10 to 14 tracks, sometimes called cuts or bands.
tracking – (1) The recording of a musical performance in either an analog or digial format. (2) The editing and assembly of the various tracks containing dialog, narration, sound effects, and music for a movie soundtrack, prior to re-recording. Also called track laying.
tracking error – (1) The difference in movement of a playback stylus in the groove of a vinylphonographrecord as compared to the movement intended when the master was cut with the stylus on the disc recording lathe. Such errors can lead to distortion, timing errors, and groove skips. (2) The difference in position of a playback head on a tape machine as compared to the position of the record head when a magnetic tape was recorded. Such errors can lead to distortion and signal loss.
track limit – the maximum number of tracks that a DAW can support. Track limit may vary by the type of tracks. For example a DAW may have limit of 256 audio tracks, but an infinite number of virtual tracks. See also track count.
track list – the list of songs appearing on an album, CD, LP, or other recorded medium. Also called a tracklist, tracklisting, or track listing.
track protection – a function found in some DAWs that allows you to protect or unprotect tracks from further changes or editing.
track sharing – using different places on a single track to record separately more than one instrument or voice. This was commonly done in the predigital era to save space on multitrack tape recordings, although it is occasionally done with DAWs for convenience.
track sheet – a chart onto which an engineer writes down information about each track of a recording. Also called a track log or track assignment log.
track template – a feature in some DAWs that allows you set up effects and other configurations for a track, similar to a session template, but for just one track.
track width – the width of a recording lane on a magnetic recording tape. The track width depends on both the width of the tape and the number of tracks it contains. For example, for a ¼-inch tape with four tracks, each track would be approximately 1⁄16 inch (¼ inch divided by 4). In actuality, they are slightly less than that to provide space between the tracks to prevent track overlap. See gap width.
trademark (TM) – a symbol, design, logo, emblem, sign, distinctive mark, word, or group of words established by use as representing a company or a product. A registered trademark is a trademark that a person or company has filed with the US Patent and Trademark Office and often carries the ® symbol.
transaural stereo – a binaural recording played through speakers rather than headphones, and processed to eliminate the crosstalk between ears (the signal from the left speaker being heard by the right ear and vice versa). A number of schemes have been devised for reducing the crosstalk, with some success. However, the process depends on the shape of the listener's head and being at the “sweet spot.” When done correctly it can come fairly close to the experience of binaural stereo without the use of headphones. Also called transaural audio or psychoacoustic surround sound.
transcode – to convert from one digital audio format to another, such as from MP3 to WMA. Transcoding is generally not recommended as it can degrade the audio quality of the file.
transcription – (1) In music, the conversion of music notation into tablature or some other form. (2) The adaptation of a musical composition. (3) A recorded radio or television program. (4) A transcription disc. Also called a trank (slang) or electrical transcription (ET). See acetate.
transfer – (1) To copy audio or audio and video from one medium to another. The term transfer implies a change of medium as a transfer to the same medium is called duplication, copying, or dubbing. (2) The copy that results from this process.
transfer function – a mathematical expression of the output of a device, such as a filter, based on the input, which determines the frequency magnitude response and phase response of the filter. When plotted as a graph, it becomes a transfer curve, a mathematical representation that describes those responses. Also called an input/output graph.
transformer core – the solid magnetic material, usually iron or steel, inside a transformer, around which a coil of wire is wound, and which provides a path for the magnetic flux generated by the current flowing through the windings.
transformer saturation – a situation in which a transformer core is producing its maximum magnetic flux, due to being undersized. This condition can adversely affect the tone of an amplifier and cause overheating of the transformer. Also called core saturation.
transient – a sharp spike in amplitude at the beginning of a waveform, such as that produced by a hammer hitting a string or a stick hitting a drum.
transient intermodulation distortion (TIM) – distortion that occurs when an audio device, such as an amplifier, cannot respond fast enough. In other words, the slew rate of the device is less than the actual rate of increase of a transient. Also called slew rate distortion.
transient response – the ability of an audio device to accurately respond to a rapidly changing input, such as that produced by a stick hitting a drum. Because a slow slew rate can result in poor transient response, the terms are sometimes used interchangeably.
transient smear – the sound that results from nonlinear phase shift (group delay) when the harmonics in a signal are delays by different amounts. Also called smearing transients.
transient voltage – a momentary change in voltage or current in the power grid that occurs over a very short period of time, typically 1⁄16 of a voltage cycle (about 3 milliseconds). Also called power surge, voltage spike, current spike, or simply spike.
translation – an indication of how well a studio mix will sound on consumer speakers, music players, and other playback devices on which it is likely to be reproduced. Sometimes called tranferability or translatability.
transmission line (TL) enclosure – a type of loudspeakerenclosure design that uses an acoustic transmission line within the cabinet. With this design sound waves emanating from the back of the bass driver pass into a long, usually folded and damped pathway within the speaker enclosure. This design uses speaker energy more efficiently, results in improved sound, and allows for greater sound control when compared to enclosures using sealed or ported designs. The pathway is usually lined with various types and amount of absorbent material, which both reduces reflection and resonance and reduces the speed of sound within the cabinet to allow for better tuning. The duct may vary in size or may taper and may be open or closed at the end. When properly designed, such enclosures absorb or reduce unwanted resonances and energies that can cause undesirable auditory effects, or cause low frequency sounds to emerge from the open end in phase with the sound radiated from the front of the driver, which enhances the low-frequency output. The result is increased efficiency and a low-frequency response that extends far below that of other speaker enclosure designs. However, their complex design tends to make them much more expensive than other designs.
transmission loss (TL) – (1) The loss in power of a signal as it travels from one point to another. Transmission loss in wires is due to resistance, inductance, and capacitance. Transmission loss with a wireless signal can be due passing through walls and other obstacles (absorption loss) or due to terrain. (2) Sound reduction.
transmitter – (1) An electronic device that converts video, audio, and/or data signals into modulatedradio frequency signals, and transmits them as electromagnetic waves. Transmitters range from small devices that send signals to a receiver within the same room to giant towers that disperse radio waves for many miles. Also called a radio transmitter. (2) An obsolete term for a microphone. Used in the early days of microphone development before the term microphone came into gemeral use.
transondent – allowing sound to pass through with no change. Transondency is to sound as transparency is to light. Pop filters and speaker grilles should be transondent.
transparency – (1) Having little to no tonal coloration in an audio signal. (2) The state in which a data compressedaudio file has a sound that is indistinguishable from the original uncompressed file, with nonexistent or imperceptible compression artifacts.
transponder – a wireless device that receives an incoming signal and automatically responds by transmitting its own signal. Transponders are used for communications, monitoring, and control and can be either passive or active. The term is a combination of the words transmitter and responder.
transverse wave – a wave in which the displacement of the medium is at right angles to the direction of propagation of the wave, as opposed to a longitudinal wave, in which the displacement of the medium is in the same direction as (or the opposite direction to) the direction of propagation. Sound waves are longitudinal.
trash microphone – a slang term for a microphone placed in the center of a drum kit capturing the entire kit. The signal from a “trash” mic is often highly compressed and mixed with other mics for special effects.
treble – (1) The vocal range of children before they reach puberty, usually a range from about A below middle C to the F one and a half octaves above middle C (A3 to F5) or above. Traditionally choirs were made up of all boys and the term boy soprano was used for this vocal range. However, with many girls now singing in such choirs, the term is no longer accurate. (2) The musical range above soprano. (3) A singer whose voice is within this range. (4) The upper end of the audio spectrum. Also called treble frequencies.
treble clef – the symbol on a music staff indicating that the second line from the bottom of a staff represents the pitch of G above middle C. Also called a G clef..
tremolo bar – a narrow bar attached to the bridge of an electric guitar that can be raised or lowered to lower or raise the pitch by changing the tension on the strings. Also called tremolo arm or whammy bar.
triboelectric effect – the creation of an electric charge in a material when it comes into frictional contact with another material. Rubbing glass with fur or running a plastic comb through hair can create triboelectricity. Most static electricity is caused by the triboelectric effect. Some electronic devices, such as some integrated circuits and transistors, can be damaged by accidental static discharge. Precautions must be taken to protect such devices by storing them in a conductive foam and by grounding yourself or standing on special mats before handling these devices. Also known as triboelectric charging.
Trident Audio Developments (TRIAD) – a manufacturer of recording studioconsoles and other pro audio equipment, headquartered in Gardena, California. Their original consoles were designed and built for in-house use at the Trident Studio, a British recording facility that opened in 1967 in London. Trident Audio Developments was formed in 1971 when word spread about the new console design and other studios placed orders.
trigger – (1) To send a signal to a device to initiate an action. (2) The signal sent to to a device to initiate an action. (3) A signal sent by an cableanalog synthesizer when a key on the keyboard is pressed or released, as well as the signal generated by foot pedals, drum controllers, and other devices. Such synthesizers had two types of triggers: (a) voltage trigger (V-trig) and (b) switch trigger or shorting trigger (S-Trig). Today, most synthesizers use an on/off trigger called a gate. Typical gate voltages are +5 volts and usually (but not always) have a positive polarity or a switch to select polarity.
trill – a rapid alternation between a note and the note a half to one tone above it.
trim – (1) To make a small adjustment to a parameter. (2) The initial control on a mixer or console used to adjust the input level of a channel. Sometimes called gain trim, gain, sensitivity, or input level. (3) To remove a portion of an audio clip or region.
triplet – a group of three music notes having the same time value of two like notes, indicated by a bracket over the notes with the number 3 above it. For example, a triplet of quarter notes would be played in the time allowed for two regular quarter notes. Also called tercet. See also tuplet.
TRS – Tip-Ring-Sleeve. A type of phone plug used with balanced audio cables and for stereo signals to a headphone. See also TS.
TRRS – Tip-Ring-Ring-Sleeve. A type of phone plug with dual rings similar to the single ring TRS connector. These connectors are used in audio/video to carry stereo audio plus a composite video signal. These cables are also used with Apple devices such as the iPad, iPhone, and iPod. See also TS and TRS.
True Audio – an audio file format for lossless audio data compression that reduces the file size by about 30%, but does not discard data during encoding, as opposed to lossy compression techniques such as MP3, AAC, and Vorbis. A digital audio file (such as a CD) that has been encoded with True Audio can be decompressed back into an identical copy of the original audio data. It uses the .tta file extension.
true bypass – the process of passing a signal directly from the input to the output of a processor. This is in contrast to regular bypass in which a signal still passes through the processing circuitry but the signal is unaffected by the processor. There is no latency in a true bypass, but not so for the regular bypass.
true diversity – a system used with wireless microphones to improve reception and minimize signal dropouts by automatically switching between two separate receivers and antennas depending upon which is receiving the stronger signal. See also diversity and antenna diversity.
trumpet – a brass musical instrument having a flared bell, tubing looped to form a straight-sided coil, and three valves. A cornet is similar to a trumpet, but it is shorter and wider, and is typically used in bands.
truss rod – a metal bar that runs through the neck of a guitar under the fretboard to counteract the tension exerted by the strings and to allow the curvature of the neck to be adjusted. Classical guitars do not require a truss rod due to the low tensile strength and high elasticity of nylon strings.
tuba – the largest and lowest-pitched of the brass instruments. The tuba has a conical bore, which causes the instrument to produce predominantly even-order harmonics. Tubas come in a variety of versions. A tuba that rests on the lap of the player is sometimes called a concert tuba. A tuba with the bell facing forward rather than upward is often called a recording tuba, because in the early days of the recording industry the sound could be directed at the recording device. A tuba that wraps around the body with the bell facing forward and used for marching is called a sousaphone, after John Philip Sousa, who used it in his marching bands.
tube distortion – a distortion of the audio signal when a recording is made with devices that use vacuum tubes. Vacuum tubes have a tendency to introduce even-ordered harmonics to the signal. The effect is very pleasing and is sometimes called “tube warmth” or “valve warmth” (British). Also called vacuum tube distortion or valve distortion (British).
Tuchel connector – a 3-pin or 5-pin microphoneconnector that was used on some early microphones, especially those manufactured in Europe. They were often called small Tuchel microphone connectors, but in the US they were known as DIN connectors. They were originally manufactured by the Tuchel company, which is now a division of Amphenol. These microphone connectors were essentially replaced by XLR connectors.
tuned cavity – an enclosed space designed so that its physical dimensions will resonate at a particular frequency, reinforcing the energy at that frequency. A tuned acoustic cavity, designed with an opening so that the air within it vibrates, is known as a Helmholtz resonator.
tuning peg – a thumbscrew or adjustable pin to which the strings of a stringed instrument are attached and used to vary the pitch. Sometimes called a tuner.
tuning system – in music the arrangement of notes (or tones) into various intervals to creates a pleasing sound. In western music, the twelve-note octave has become the predominant tuning system. However, it is impossible to arrange twelve notes so that all intervals are pure intervals, meaning they have simple ratios to one another and sound consonant. To ovecome this problem, various schemes have been devised to approximate the pure intervals, and these schemes are called temperaments. Although the terms tuning system and temperament are often used interchangeably, they are not exactly the same. The tuning system is the framework of notes and intervals, while the temperament is the method used to approximate that system. A tuning system should have perfect intervals, but since that is impossible, a temperament must be used.
tuplet – a rhythm with a given beat that is divided into a different number of equal subdivisions, such as duplets and triplets, usually grouped with a bracket with a number or numbers above it. Also known by many other terms, such as irrational rhythm, irrational groupings, artificial division, artificial groupings, abnormal divisions, irregular rhythm, gruppetto, extra-metric groupings, and contrametric rhythm.
turnaround – a passage at end of a section of music that leads to the next section, either harmonically (such as a chord progression) or melodically.
turns ratio (TR) – the ratio of number of turns of wire in the primary winding of a transformer to the number of turns of wire in the secondary winding. The TR determines how much the voltage is stepped up or down by the transformer.
turntable – (1) A device used to playback a phonographrecord, consisting of a disc or platter rotated by a motor, and a tonearm that contains a stylus and cartridge. (2) One of two round disc platters found on a tape machine that holds the tape reels in place, sometimes with a locking mechanism. Also called a tape disc.
turntablist – a person who uses turntables and a DJ mixer as a musical instrument to create music and sounds. The term is used to differentiate between a DJ who simply plays records and one who performs by manipulating the records, stylus, and mixer to produce sounds.
turntablism – the art of creating sounds and music by manipulating turntables and a DJ mixer. The person performing the art is called a turntablist.
tweak – (1) To trim. (2) (Slang) To calibrate, especially when done very precisely.
tweeter – the driver in a loudspeakercabinet designed to produce the higher range of audio frequencies, typically from about 1,000 hertz (Hz) up to around 20 kilohertz (kHz). Three important properties for tweeters, especially for cone and dome tweeters, are low mass, high stiffness, and good damping. There are several types of tweeters. Cone tweeters have the same basic design as a conventional dynamic speaker. Cones are typically made of paper, silk, coated fabric, or ceramic. Cone tweeters were popular in the 1960s and 1970s, but
fell out of favor during the 1970s and 1980s with the introduction of higher quality audio, especially the compact disc, because the frequency response of cone tweeters seldom exceded 15 kHz. Developed in the 1950s, the dome tweeter began to replace the cone tweeter in the 1970s. The dome tweeter consists of a voice coil attached to a dome typically made of woven fabric or thin metal (aluminium, titanium, magnesium, or beryllium), with the magnet attached to a front plate instead of a frame or basket. A ribbon tweeter uses a diaphragm that consists of a very thin corrugated ribbon made of metal or metal-coated plastic film that is suspended in a magnetic field. The development of ribbon tweeters has paralleled the development of ribbon microphones. Planar magnetic tweeters (sometimes called quasi-ribbon tweeters) uses a thin piece of plastic film with a voice coil wire running numerous times vertically across it. They are generally less expensive than true ribbon tweeters. An electrostatic tweeter is similar to a full-range electrostatic speaker. It uses a thin plastic diaphragm with a thin conductive coating, suspended between two screens or perforated metal sheets, called stators. Because very high voltage is applied to the diaphragm, a step-up transformer is required. The air motion transformer (AMT) tweeter works by forcing air perpendicularly through a pleated diaphragm held in a strong magnetic field. They are capable of considerable output levels and are more sturdy than electrostatics or ribbons. A horn tweeter can be any of the above tweeters designs but is attached to a flared-horn structure. Horns help improve dispersion and increase efficiency. A piezoelectric tweeter contains a piezoelectric crystal attached to a diaphragm. Piezo tweeters are never used in high-end audio because of their low fidelity. Also called a high-frequency driver.
twelve-string guitar – a guitar having twelve steel strings in six courses. That layout creates a richer tone with more ringing than the standard six-string guitar. The strings within each course are close together so that each course is fretted and plucked together. Typically, the strings of the lower four courses are tuned an octave apart, while the upper two courses are tuned in unison.
twisted pair – two copper wires each covered with insulation that are twisted together. There may be multiple sets of twisted pairs within a single cable. The twisted pair maybe shielded, indicated as STP (shielded twisted pair), or unshielded, UTP (unshielded twisted pair).
twin-diode tube – a vacuum tube with two linked diodes to pass current, providing for two tube stages in a single vacuum tube. Also called a double-diode tube.
two-way radio – a radio that both can transmit and receive, unlike a broadcast radio that only receives programming. Two-way radios are used by amateur radio enthusiasts, as well companies and individuals that need a means to communicate. These devices often have a push-to-talk button to activate the transmitter. Somestimes called a transceiver. Hand-held portable two-way radios are called walkie-talkies or handie-talkies.
Tyco – a company founded in 1960 as Tyco, Inc., an investment and holding company with two segments: Tyco Semiconductors and The Materials Research Laboratory. Over the years, it expanded through acqusitions, and in the 1980s, reorganized its subsidiaries into four segments: Electrical and Electronic Components, Healthcare and Specialty Products, Fire and Security Services, and Flow Control. It became Tyco International in 1992. In 2007, Tyco slit into three publicly independent companies: Covidien Ltd. (formerly Tyco Healthcare), Tyco Electronics, Ltd. (becoming TE Connectivity), and Tyco International, Ltd. (formerly Tyco Fire & Security and Tyco Engineered Products & Services (TFS/TEPS)).
type A plug – an ordinary household ungroundedelectricalplug used in the US, North and Central America, and Japan having two flat blades (polarized versions having one blade larger than the other), but no ground pin. It was designed by Harvey Hubbell II in 1903. It is designated as American standard NEMA 1-15. Sometimes called a Hubbell plug. See also type B plug.
type B plug – an ordinary grounded household electricalplug used in the US, North and Central America, and Japan having two flat blades (polarized versions having one blade larger than the other) and a semi-round ground pin. It is designated as American standard NEMA 5-15. Also called a PBG (Parallel-Blade-Ground) plug, U-ground plug, or Edison plug. See also type A plug.
type B videotape – a professional 1-inch analogreel-to-reelmagnetic tape format for video developed by Robert Bosch GmbH in Germany and introduced in 1976. This videotape format became the broadcasttelevision standard in continental Europe, but had only limited use in the US and UK, where the type C videotape became the primary format. Type B videotape recorded video using two record/playback heads on a small head drum rotating at 9,000 RPM with a 190° wrap and had three longitudinal tracks, two audio tracks and one linear timecode (LTC) track. Unlike type C, the type B format required additional equipment to add functions, such as still, shuttle, and variable-speed playback. Also called B-format.
Note: We believe this is the largest dictionary (glossary) of terms specific to usage within the recording industry that is currently available on the internet, with more than 8,300 entries, nearly 600 illustrations, and dozens of tables. Some of the terms have different or additional meanings in other situations, especially within the electronic, automotive, scientific, and computer industries. Of necessity there are obvious overlaps into other fields such as music, electronics, and computers, but such excursions are limited to information deemed pertinent to the knowledge required to operate and/or participate effectively in the workings of a recording studio. Also included are terms related to sound reinforcement (live performances) including wireless microphone technology because a working knowledge of that terminology is necessary for recording at live performance venues. Because recording studios also record audio for video and motion pictures (films), some terminology from those fields is included. Some scientific terms are included because they help explain studio terminology. For example, electromagnetism explains how microphones, loudspeakers, and guitar pickups work. Knowledge of radio waves and the radio frequency spectrum is needed to explain wireless devices. Any trademarks or trade names mentioned belong to their respective owners. The information contained in this dictionary is believed to be accurate at the time of publication. This information is subject to change without notice. The information was obtained from and cross-checked with a variety of sources that are believed to be reliable. However, Los Senderos Studio, LLC does not guarantee the accuracy or completeness of the information contained herein. Please contact us to report any errors, omissions, discrepancies, or broken links. Los Senderos Studio shall not be responsible for any consequences or damages arising out of the use of this information. Nothing in this glossary should be interpreted as legal advice. For a glossary providing information on legal and business matters for musicians, we suggest you consult Musicians Business Dictionary.
A note on alphabetical order: The terms in this glossary are alphabetical without regard to spaces and punctuation. For example, AM Radio follows amplitude. While this may seem to be at odds with other conventions, it eliminates confusion with words such as pickup, which is sometimes written as pick up or pick-up. In addition, all symbols such as &, -, or / are ignored. The entries on the number page (0-9) are listed in increasing value within each digit. For example, all of the entries beginning with 1 are listed before those starting with 2. For Greek letters (α-ω), the entries are in Greek alphabetical order.