Brooks Audio Design

1) The frequency response achieved by mixing a direct signal with a delayed signal of equal strength especially at short delays. 2) Loosely used to also describe effects that can be achieved with comb filtering as part of the processing. Action In guitar playing, action refers to how far the strings sit off of the guitar neck. When strings are close to the neck, it is referred to as "Low Action". When the string sit far above the neck, it is called "High Action". Guitars with low action are easier to play, but make sure they are not too close, or it could causing buzzing. Brooks Cinema KP 30 Half Step A pitch difference of the amount that is present between adjacent keys on a piano. Formant An element in the sound of a voice or instrument that does not change frequency as different pitches are sounded. Brooks Cinema XB 33 Active/Inactive Microphones Scientific definitions aside, active microphones generally sound better than inactive ones

Used inside of full range speaker cabinets to separate highs, mids, and lows and send them to their respective speakers within the each cabinet. These are not as efficient as active crossovers because they require all frequencies to draw from the same source of amplification. Input/Output Module A set of controls, on one housing, for an in-line console that has two channels (one for recording and one for monitoring) and has controls for all console sections. Brooks GT 845 High Impedance Mic A microphone designed to be fed into an amplifier with input impedance greater than 20 k ohms. LED A light that allows current to flow in one direction only and emits light whenever a voltage of a certain level or beyond is applied to it. Brooks TA 60 Compact Disc, Interactive CDI A Compact Disc, usually containing audio, video, and text, which the user can interact with in that the display or playback changes after the user performs some action. Driver See transducer

1) Digital sound storage medium. Provides a high quality source of music, sound effects etc. Also used as a playback medium for sound effects etc. by large theatres with long running shows, although CDR (Recordable CD) is becoming more affordable by the day. 2) An abbreviation of the term Compact Disc (a small optical disk with digital audio recorded on it). Grouping 1) Controlling the gain of several individual channels with a Group Fader. 2) The mixing together of several individual audio signals to send a mixed signal out of the console to record a track on a multitrack tape machine. Brooks Cinema RM 909 Line 1) Short for line level. 2) A cable. Electromagnetic Field Magnetic energy put out because of current travelling through a conductor. Brooks BA 71 High-Pass Filter A device that rejects signals that are below a certain frequency (called the cut-off frequency) and passes signals with frequencies that are higher. Group Faders The VCA faders o

An input of the console, which brings back the echo (reverberation) signal from the echo chamber or other echo effects device. Amplitude The extreme range of a signal. Usually measured from the average to the extreme. Brooks Cinema RM 909 Feed To send an audio or control signal to. Level The amount of signal strength; the amplitude, especially the average amplitude. Brooks QS 70 Axis A line around which a device operates. Example: In a microphone, this would be an imaginary line coming out from the front of the microphone in the direction of motion of the diaphragm. Keyboard Controller A device that has the standard music keys of piano but puts out MIDI signals Compact Disc, Read Only Memory CDROM A Compact Disc used to store digital data, such as large programs, that can be read by a computer. Hard Disk (Hard Disc) A storage unit for digital data that has rigid disks coated with magnetic material in a housing that includes the drive mechanis

A balanced cable used for low impedance microphones and sometimes for connections between some parts of the PA. Commonly referred to as a "mic cord". Crossover, Passive Used inside of full range speaker cabinets to separate highs, mids, and lows and send them to their respective speakers within the each cabinet. These are not as efficient as active crossovers because they require all frequencies to draw from the same source of amplification. Brooks Cinema GT 845 Amplitude The height of a waveform above or below the zero line. Line 1) Short for line level. 2) A cable. Brooks TA 60 Isolation A containing of the sound wave in a certain area so that it will not leak into other areas and/or unintended mics. Assistant Engineer A less elevated version of the term Second Engineer. Experienced seconds often place microphones, operate tape machines, break down equipment at the session end and keep the paperwork for the session. Floppy Disk (Floppy

A Compact Disc, usually containing audio, video, and text, which the user can interact with in that the display or playback changes after the user performs some action. Kilo A prefix meaning 1000. Brooks Cinema GT 845 Hz (Hertz) 1) An abbreviation for the term Hertz (the unit of frequency). 2) Unit of frequency equivalent to the number of cycles per second. Crossover, Active A rack mountable unit used to separate frequencies leaving the soundboard into high's, mids, and lows with different outputs for each. Brooks Cinema TZ 505 Full Range Describes a sound which covers all audible frequency ranges. As in "full range speaker cabinets." Bass Roll Off An electrical network built into some microphones to reduce the amount of output at bass frequencies when close-micing. Fletcher Munson Effect A hearing limitation shown by Fletcher Munson Equal Loudness Contours (as music is lowered in volume, it is much more difficult to hear bass frequ

Scientific definitions aside, active microphones generally sound better than inactive ones, but they generally cost more. They also require the use of either a battery or phantom power while inactive mics need only be plugged into the mic cord in order to work. In most playing situations, the subtle improvement in sound quality from an active mic isn't worth the extra cost and hassle. One possible exception it the headset mic. Put simply, inactive headset mics just plain suck. Active headset mics put out a much stronger signal and feed back much less. Automatic Gain Control (Automatic Volume Control) A compressor with a very long release time used to keep the volume of the audio very constant. Brooks XB 22 Insulator A substance such as glass, air, plastic, etc., that will (for all practical purposes) not conduct electricity. CD (Compact Disc) : 1) Digital sound storage medium. Provides a high quality source of music, sound effects etc. Also used as a playback me

1) The depth and thickness of a sound, usually on the bottom end of the EQ (as in "needs more balls"). 2) The strength of the voice on the mic (as in "check it like you have some balls"). Folded Horn A speaker design where the speaker points back into the cabinet and bounces around finally coming out large ports in the front. It is intended to maximize low frequencies in a relatively small cabinet. Brooks GT 44 Ground Lift A switch that breaks the connection between the ground point in one circuit and the ground point in another circuit. Hard Disk Recording The recording of digital audio onto a hard disc. Brooks Cinema Series Action In guitar playing, action refers to how far the strings sit off of the guitar neck. When strings are close to the neck, it is referred to as "Low Action". When the string sit far above the neck, it is called "High Action". Guitars with low action are easier to play, but make sure they are not

The condition of obtaining a change at the output of the device which is proportional to the change occurring at the input. Crossover, Passive Used inside of full range speaker cabinets to separate highs, mids, and lows and send them to their respective speakers within the each cabinet. These are not as efficient as active crossovers because they require all frequencies to draw from the same source of amplification. Brooks KS-55 Line In (Input, return) Where a signal enters the board or component. Humbucker Pickups that are coupled together to get a certain sound. Brooks QS 70 CD (Compact Disc) : 1) Digital sound storage medium. Provides a high quality source of music, sound effects etc. Also used as a playback medium for sound effects etc. by large theatres with long running shows, although CDR (Recordable CD) is becoming more affordable by the day. 2) An abbreviation of the term Compact Disc (a small optical disk with digital audio recorded on it). Bi

A route back into the sound desk for a signal sent to a piece of outboard equipment via an auxiliary send. Group 1) A number of channels or faders that can be controlled by one Master VCA slide. 2) A shortening of the term Recording Group (a buss or the signal present on a buss). Brooks Cinema KP 30 FOH (Front of House) Refers to the speakers that face toward the audience. Also called the "main" speakers. Console A set of controls and their housing, which control all signals necessary for recording and mixing. Brooks VT-50 Electret Condenser A condenser microphone that has a permanently polarized (charged) variable capacitor as its sound pressure level sensor. Beat 1) The steady even pulse in music. 2) The action of two sounds or audio signals mixing together and causing regular rises &.falls in volume. Compression Driver The unit that feeds a sound pressure wave into the throat of a horn (in a horn loudspeaker). Crisp Descr

The action of deforming a waveform during overload. Editing 1) Changing the sequence of a recording by cutting the recording tape and putting the pieces together in the new sequence with splicing tape. 2) Punching in and then punching out on one or more tracks of a multitrack tape recorder to replace previously recorded performances. 3) Changing the sequence of a digital recording's playback by computer program. Brooks Speakers Keynote Number A number assigned to each key of a synthesizer or controller keyboard that is transmitted in the MIDI signal. Floor 1) An alternate tam meaning Range (a limit on the amount the signal is reduced when the input signal is low by an expander or gate). 2) A shortening of the term Noise Floor (the level of the noise). Brooks SS 81 Lead Sheet A written chart showing the melody, lyrics and chords of a tune with full musical notation. Fat Having more than a normal amount of signal strength at low frequencies or ha

Sending too high of a signal level into a device so that the first amplifier of the device overloads. Jack 1) Anywhere you plug something in. 2) Segmented audio connector. Mono Jacks have two connections �" tip and sleeve, and are unbalanced. Stereo jacks have three connections �" tip, ring and sleeve. B-type jacks (also known as Bantam jacks) were originally designed for use in telephone exchanges and provide a high quality (and expensive) connection in jackfields. A-type jacks are cheaper and more common, but more fragile. A type jacks are available in 2 sizes : quarter inch and eighth inch. 3) A connector mounted on the case of a device or on a panel. Brooks GT 845 Assistant Engineer A less elevated version of the term Second Engineer. Experienced seconds often place microphones, operate tape machines, break down equipment at the session end and keep the paperwork for the session. Arc The visible sparks generated by an electrical discharge. Broo

1) The signal fed back to the musicians through headphones. 2) To set the tape or disc so that the intended selection will immediately play when the tape machine or player is started. 3) A location point entered into a computer controlling the playback or recording of a track or tape. 4) In MCI brand tape machines, a term meaning the same thing as Sync Playback (where the record head is used as a playback head for those tracks already recorded). Kick (Kick Drum) Another term for Bass Drum. Brooks Cinema XR 607 Axis A line around which a device operates. Example: In a microphone, this would be an imaginary line coming out from the front of the microphone in the direction of motion of the diaphragm. Dry Describes a sound coming from the PA with no effects on it. Brooks GS 15 Crossover, Active A rack mountable unit used to separate frequencies leaving the soundboard into high's, mids, and lows with different outputs for each. High Impedance Cord (Hi

The way your PA sounds just before it blows up. Fuzzy and scratchy. If you hear this, it either means you have something hooked up wrong, or something in the system is going bad. It could be anything from your super expensive soundboard to a five dollar patch cord. Clip The action of deforming a waveform during overload. Brooks KM 77 Blending 1) A condition where two signals mix together to form one sound or to give the sound of one sound source or one performance. 2) Mixing the left and right signal together slightly which makes the instruments sound closer to the center of the performance stage. 3) A method of panning during mixing where instruments are not panned extremely left or right. Bridge The bridge assembly, or just "bridge" is an area on the face of the guitar where the string meet or are connected to the face. Brooks GT 845 Instrument Amplifier A device that has a power amplifier and speaker in a case (or in separate cases) to reproduce

Impedance of 5000 or more ohms. Jack 1) Anywhere you plug something in. 2) Segmented audio connector. Mono Jacks have two connections �" tip and sleeve, and are unbalanced. Stereo jacks have three connections �" tip, ring and sleeve. B-type jacks (also known as Bantam jacks) were originally designed for use in telephone exchanges and provide a high quality (and expensive) connection in jackfields. A-type jacks are cheaper and more common, but more fragile. A type jacks are available in 2 sizes : quarter inch and eighth inch. 3) A connector mounted on the case of a device or on a panel. Brooks XT 20 Input Overload Sending too high of a signal level into a device so that the first amplifier of the device overloads. I/O Short for "Input/Output' and referring to: 1) An in-line console module that contains controls for the input section, output section and monitor section. 2) A module in electronic gear containing input and output amplifiers fo

1) A hand-held, telescoping pole used to hold the microphone in recording dialogue in film production. 2) A telescoping support arm that is attached to a microphone stand and which holds the microphone. 3) Loosely, a boomstand. Automatic Gain Control (Automatic Volume Control) A compressor with a very long release time used to keep the volume of the audio very constant. Brooks TM-22 Figure Eight Pattern Another name for Bi-directional Pattern (microphone pickup pattern picking up best from the front and back of the diaphragm and not picking up from the side of the diaphragm). Byte A grouping of eight information bits. Brooks Cinema GT 845 Boundary Mic A microphone mounted on a flat plate that acts as a reflective surface directing sound into the mic capsule. Used for general pick-up over a large area. See PCC, PZM. Floor 1) An alternate tam meaning Range (a limit on the amount the signal is reduced when the input signal is low by an expander or gate).

An Abbreviation of kilo-Hertz. Fade 1) A gradual reduction of the level of the audio signal. 2) A gradual change of level from one pre-set level to another. Brooks BA 71 Hearing Limitation An inability of the ear to hear important characteristics of sound under certain conditions. Characteristics that can be affected include pitch, level, clarity, presence and direction. Hard Disk (Hard Disc) A storage unit for digital data that has rigid disks coated with magnetic material in a housing that includes the drive mechanism. Brooks KS-55 Far Field The area from 3 feet away from the sound source up to the critical distance. Chamber 1) An Echo Chamber (a room designed with very hard, non-parallel surfaces equipped with a speaker and microphone so that when dry signals from the console are fed to the speaker, the microphone will have a reverberation of these signals that can be mixed in with the dry signals at the console). 2) A program in a delay/reverb ef

To increase gain, especially to increase gain at specific frequencies with an equalizer. Foot Pedal 1) An effects device where the amount of the effect can be controlled by a musician with his foot. 2) The beater mechanism of a foot drum that is activated by the drummer's foot to play the drum. 3) Any device, like a volume control, that can be operated by the foot. Brooks Cinema Projectors Automatic Gain Control (Automatic Volume Control) A compressor with a very long release time used to keep the volume of the audio very constant. Keying Input (Key Input) An input on a dynamics processing device to control the device by an external audio signal. Brooks Cinema XB 33 Error Message A prompt on a computer screen telling the operator that an error has occurred. Jack 1) Anywhere you plug something in. 2) Segmented audio connector. Mono Jacks have two connections �" tip and sleeve, and are unbalanced. Stereo jacks have three connections �"

A drawing of several curves showing how loud the tones of different frequencies would have to be played for a person to say they were of equal loudness. Headphones Devices that can be worn on the head with small speakers that fit over the ears (or sometimes into the ears). Brooks KS-55 Chord Three or more musical pitches sung or played together. Charge The electrical energy of electrons. The energy is in the form of a force that is considered negative and repels other like forces (other electrons) and attracts opposite (positive) forces. Brooks XB 22 Field 1) In video, one half of a frame. 2) In computer-controlled devices a window display with functions and choices that the operator can make Chorusing 1) A term meaning the same thing as Chorus (Definition 3 or 4). 2) In some delay effects devices, a term used to mean the term Depth (the amount of change in the controlled signal by the control signal). Bass Roll Off An electrical network built

An index signal (digital data that gives the machine information of where selections start, their selection number, etc.) on a DAT or CD. Barrier Micing A method of placing the head of a microphone as close as possible to a reflective surface, preventing phase cancellation. Brooks GT 845 Hz (Hertz) 1) An abbreviation for the term Hertz (the unit of frequency). 2) Unit of frequency equivalent to the number of cycles per second. Guitar Controller An electric guitar or device played like an electric guitar that puts out MIDI signals that can be used to control synthesizers and sound modules. Brooks M 44 Basic Session The First session in recording an audio production to record the Basic Tracks. Electrons Negatively charged particles, which revolve around the centre of atoms. The movement of such electrons down a conductor causes electrical current. Baffles Sound absorbing panels used to prevent sound waves from entering or leaving a certain space

An abbreviation of Beat Per Minute (the number of steady even pulses in music occurring in one minute and therefore defining the tempo). Inductance The property of an electric circuit by which a varying current in it produces a varying magnetic field that introduces voltages in the same circuit or in a nearby circuit. It is measured in henrys. Brooks Cinema XB 33 Channel 1) In multitrack tape machines, this term means the same thing as the term Track (one audio recording made on a portion of the width of a multitrack tape). 2) A single path that an audio signal travels or can travel through a device from an input to an output. A/D An abbreviation of Analog to Digital Conversion (the conversion of a quantity that has continuous changes into numbers that approximate those changes), or Analog to Digital Converter. Brooks GT 845 Amp 1) An abbreviation of the term Amplifier (A device which increases the level of an electrical signal. 2) An abbreviation of Amper

Short for System Exclusive Bulk Dump (a method of transmitting data, such as the internal parameters of a MIDI device to another MIDI device). Controller 1) In MIDI, a device that generates a MIDI signal to control synthesizers, sound modules or sample playback units. 2) A remote control unit for a multitrack tape machine which controls transport functions as well as monitor selection switching functions and record ready/safe status of each track. 3) Any device generating a control voltage or signal fed to another device's control input. Brooks Cinema Series Ground Lift A switch that breaks the connection between the ground point in one circuit and the ground point in another circuit. Compressor A signal processing device that does not allow as much fluctuation in the level of the signal above a certain adjustable or fixed level. Brooks Cinema Projectors Cascade To set and interconnect two mixers so that the stereo mixing buss(es) of the first mixer fe

An abbreviation of the term Intermodulation Distortion (Distortion caused by one signal beating with another signal and producing frequencies that are both the sum and the difference of the original frequencies present). Chip 1) A slang term with the same meaning as the term IC (a miniature circuit of many components that is in small, sealed housing with prongs to connect it into equipment). 2) The thread cut away from the master lacquer to make the groove, while disc recording. Brooks Cinema TZ 505 Barrier Micing A method of placing the head of a microphone as close as possible to a reflective surface, preventing phase cancellation. Audio Most often referring to electrical signals resulting from the sound pressure wave being converted into electrical energy. Brooks GT 44 Effects Electronic boxes (usually rack mounted) added to a PA system to subtly change and enhance the signals going through it. Examples include; Reverb, Delay, Compressor, Chorus. Gain

The front or body of the guitar. Fletcher Munson Effect A hearing limitation shown by Fletcher Munson Equal Loudness Contours (as music is lowered in volume, it is much more difficult to hear bass frequencies and somewhat harder to hear very high frequencies). Brooks XB 33 Ground Lift A switch that breaks the connection between the ground point in one circuit and the ground point in another circuit. Atom The smallest particle which makes up a specific substance. It's composed of a center around which electrons revolve. Brooks RM 80 Keying Input (Key Input) An input on a dynamics processing device to control the device by an external audio signal. Early Reflections The first echoes in a room, caused by the sound from the sound source reflecting off one surface before reaching the listener. Imaging To make a representation or imitation of the original sonic event. Layering The recording (or playing) of a musical part with of several similar

1) A technician in charge of a recording session; Also called Recording Engineer. 2) A person with an engineering degree. 3) A person with sufficient experience in the field to be equivalent to the education one would receive earning an engineering degree. Atom The smallest particle which makes up a specific substance. It's composed of a center around which electrons revolve. Brooks TM-22 Inductance The property of an electric circuit by which a varying current in it produces a varying magnetic field that introduces voltages in the same circuit or in a nearby circuit. It is measured in henrys. Guitar Processor A unit that will add effects to a direct guitar signal, including a simulated instrument amplifier sound and (often) delay and reverb effects. Brooks GT 845 Central Processing Unit 1) The main "brain" chip of a computer that performs the calculations and execution of instructions. 2) The main housing of a computer that contains the &q

A light that allows current to flow in one direction only and emits light whenever a voltage of a certain level or beyond is applied to it. High Hat A double cymbal on a stand which can be played with a foot pedal or by the top cymbal being hit with a stick. Brooks GT 44 Capsule 1) The variable capacitor section of a condenser microphone. 2) In other types of microphones, the part of the microphone that includes the diaphragm and the active element. Format 1) The number of tracks, their width, spacing and order for tape recording. 2) To prepare a digital storage medium so that it will accept and store digital information bits. Brooks Cinema xm 808 Ground Lift A switch that breaks the connection between the ground point in one circuit and the ground point in another circuit. Frets Vertical metal wires which sit vertically on the guitar neck. Input 1) The jack or physical location of where a device receives a signal. 2) The signal being receive

A standard adopted by IEC for sending and receiving digital audio based on The AES Professional Interface. Inductor A device designed primarily to introduce inductance into an electric circuit. Sometimes called a choke or coil. Brooks Cinema XR 607 Centre Frequency The frequency of the audio signal that is boosted or attenuated most by an equalizer with a peak equalization curve. Coax Two-conductor cable consisting of one conductor surrounded by a shield. Brooks QS 70 Echo Chamber 1) A room designed with very hard, non-parallel surfaces and equipped with a speaker and microphone. 2) Any artificial or electronic device that simulates the reverberation created in a room. AES An abbreviation of Audio Engineering Society. Error Concealment Putting replacement information bits into a digital audio signal to replace lost bits when the digital recording or processing system cannot verify whether the lost bits were l's or 0's but can make a good

The bits in the digital signal that make up actual values or commands being communicated as opposed to bits that are used for checking & correcting data or other purposes. Central Processing Unit 1) The main "brain" chip of a computer that performs the calculations and execution of instructions. 2) The main housing of a computer that contains the "brain" chip as opposed to other pieces of the computer system such as keyboards, monitors, etc. Brooks QS-70 ADSR The letters A, D, S &R are the first letters of: Attack, Decay, Sustain and Release. These are the various elements of volume changes in the sounding of a keyboard instrument. Infinite Baffle A baffle so large that the sounds coming from one side do not reach the other side. Brooks Speakers Linear The condition of obtaining a change at the output of the device which is proportional to the change occurring at the input. Gate A dynamic processing device that turns a chann

A visual picture or symbol on a computer screen that represents a file, program or disc that can be used. Ground In electronics, a place (terminal) that has zero volts. Brooks Cinema RM 909 Level The amount of signal strength; the amplitude, especially the average amplitude. Buss (Bus) A wire carrying signals to some place, usually fed from several sources. Brooks Speakers Hard Disk Recording The recording of digital audio onto a hard disc. Engineer 1) A technician in charge of a recording session; Also called Recording Engineer. 2) A person with an engineering degree. 3) A person with sufficient experience in the field to be equivalent to the education one would receive earning an engineering degree. Crossover (Crossover Network) A set of filters that "split" the audio signal into two or more bands (two or more signals, each of which have only some of the frequencies present). Condenser Microphone A microphone which converts so

The First session in recording an audio production to record the Basic Tracks. Board 1) Another, less formal, term for Console. 2) A set of controls and their housing which control all signals necessary for recording and for mixing. 3) A slang shortening of the term Keyboard Instrument. Brooks Cinema TX 509 Bottom The bass frequencies (as in "needs more bottom end"). Centre Frequency The frequency of the audio signal that is boosted or attenuated most by an equalizer with a peak equalization curve. Brooks GT 845 Baffles Sound absorbing panels used to prevent sound waves from entering or leaving a certain space Cable, XLR A balanced cable used for low impedance microphones and sometimes for connections between some parts of the PA. Commonly referred to as a "mic cord". Bandwidth 1) The range of frequencies over which a tape recorder, amplifier or other audio device is useful. 2) The range of frequencies affected by an equaliz

1) To add sounds into a mix or recording that have no synchronization. 2) An application of this where a performance from one part of a tune is recorded and then recorded back into the recording at a different time in the recording. Equal Loudness Contours A drawing of several curves showing how loud the tones of different frequencies would have to be played for a person to say they were of equal loudness. Brooks Cinema Series Line Out (Line Output) Any output that sends out a line level signal, such as the output of a console that feeds a recorder. Key The control of a dynamics processing device by an external audio signal. Brooks GT 845 Cable, TRS A less common balanced cable that has 3 different contacts on its 1/4 inch connectors. Most headphone jacks are a good example of a TRS (Tip-Ring-Sleeve) connector. These are sometimes used instead of the more common XLR connection. Contact Microphone A device that senses vibrations and puts out an audio si

A unit used in the measure of frequency, equivalent to Hertz. Cycles Per Second is an outdated term replaced by Hertz in 1948. Atom The smallest particle which makes up a specific substance. It's composed of a center around which electrons revolve. Brooks TM-22 Current The amount of electron charge passing a point in a conductor per unit of time. Compact Disc CD A small optical disk with digital audio recorded on it. Brooks TA 60 Floor Toms The large toms to the right of the drummer. Librarian Program A computer program allowing the storage of the parameters of sound patches outside of a synthesizer. Layering The recording (or playing) of a musical part with of several similar sound patches playing simultaneous. Electret Condenser A condenser microphone that has a permanently polarized (charged) variable capacitor as its sound pressure level sensor.

1) A punch in of the all of the tracks being recorded in a recording session. 2) On Solid State Logic consoles, placing an outboard piece of gear in the channel by patching and activating a switch. Coax Two-conductor cable consisting of one conductor surrounded by a shield. Brooks Cinema NZ 60 Engineer 1) A technician in charge of a recording session; Also called Recording Engineer. 2) A person with an engineering degree. 3) A person with sufficient experience in the field to be equivalent to the education one would receive earning an engineering degree. Frequency The number of cycles of a waveform occurring in a second. Brooks TA 60 Inductor A device designed primarily to introduce inductance into an electric circuit. Sometimes called a choke or coil. CD (Compact Disc) : 1) Digital sound storage medium. Provides a high quality source of music, sound effects etc. Also used as a playback medium for sound effects etc. by large theatres with long runn