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Now looking at definitions starting with letter "d"

D-connector : See D-sub(miniature) connector.

D-sub(miniature) connector : Also called a D-connector, or a D-type connector. A type of connector commonly found on computers and data transmission devices, including SCSI devices and computer monitors. D-type connectors have a "D-shaped" angled housing, and have 9-pin, 15-pin, and 25-pin configurations, designated DE-9, DA-15, and DB-25, respectively.

D-type (connector) : See D-sub(miniature) connector.

D.C. : Da Capo. Italian for "Head," meaning "Play from the beginning."

D.S. : Dal Signo. "Play from the sign(D)."

D/A : See digital-to-analog converter.

DAC : See digital-to-analog converter.

DAE : (1) Digidesign Audio Engine.™ A Macintosh application that can run behind other applications, such as sequencers or ProTools,™ handling the transfer of audio data to/from the hard disk. DAE is licensed by many sequencer developers to avoid writing their own low-level I/O code. (2) Digital Audio Extraction. The process of capturing CD-Audio tracks digitally from a CD-ROM drive to hard drive, using software such as Astarte’s CD Copy™ or OMI’s Disc-to-Disk.™"

dailies : Uncut footage shot each day during production. If picture editing is on film, with picture and synchronized magnetic film, those elements when edited together become the workprint and worktrack. Used to chart the progress of the film and for preliminary music cuts. Also called rushes.

daisy chain : See serial(2).

damping : (1) Damping is the addition of friction to a resonance in order to remove energy from a mechanical system, reducing the magnitude of vibration at resonant frequencies. For example, the reduction of movement of a speaker cone, due either to the electromechanical characteristics of the speaker driver and suspension, or the effects of pressure inside a speaker enclosure. The electrical analog of friction is resistance, and it is used to damp resonating electrical circuits, such as crossover networks and filters. See also Q. (2) Acoustic fiberglass material used inside speaker enclosures."

damping factor : (1) A factor defined as the rated load divided by the amplifier output impedance. (2) The ability of an amplifier to control the motion of a loudspeaker cone after a signal disappears, i.e., its ability to defeat the natural ringing tendency of the body (cone) in motion. An amplifier with a high damping factor looks more like a kind of short circuit to the speaker, reducing its vibration when the signal stops. The damping factor of an amplifier will vary with frequency, and sometimes a manufacturer will publish a curve of damping factor vs. frequency. The effect of high damping factors is most audible at low frequencies, where the primary resonance of the woofer cone, called hangover, is reduced in level.

DAR : See Digital Audio Recorder. Any type of audio recording system which records upon a digital medium, such as DAT or hard disk. DAT or DCC recorders, digital dubbers, digital multitracks, and hard-disk recording systems are all example of digital audio recorders. These recorders are an alternative to analog recorders, such as traditional cassette or reel-to-reel formats which do not convert the waveform to a digital representation prior to writing it to the recording medium.

darkness : The amount of low-frequency, or corresponding lack of high-frequency, components of a sound. Reverberation from distant objects usually has fewer high frequencies and sounds darker than reverb from close objects. The opposite of brightness.

DASH : Digital Audio Stationary Head. A standard format for ensuring compatibility between Sony PCM-model digital multitrack recorders which that use stationary, rather than rotating heads. Originally, the DASH format was designed to support 2-track, 8-track, 16-track, and 24-track recorders using reel-to-reel tape. The 8-track and 16-track machines were never marketed, and a 2-track model is no longer in production. The DASH specification now includes double-density, thin-film heads that allow 48-track recording on the same tape originally used by the 24-track devices. DASH-format machines are backward compatible: 24-track machines can be used with newer models, and a project can be started on a 24-track machine and completed on a 48-track recorder, if needed, as the data from tracks 25-48 are written into the spacing between the original 24 tracks. DASH tapes run 30ips at up to 48kHz, with 44.1kHz and other sampling rates supported. In addition to 24-track or 48-track recording, DASH format provides two analog cue tracks and one track each for control and timecode signals. The format covers a wide range of versions, such as from 2-48 tracks and tape speeds from 12-76cps, and was agreed on by Sony and Studer, among others. DASH format recorders are currently manufactured by Sony and Studer. See also S-DAT, ProDigital.

DAT : Digital Audio Tape. There are two formats: R-DAT which uses a rotating head assembly similar to a VCR, records diagonally across the tape, and includes a four-channel format which would permit recording of ambisonics; and the S-DAT which uses a stationary head and records several linear, parallel tracks of digital signals. There are no known commercial S-DAT products. The DAT standard format specifies a small cassette that provides up to two hours of 16-bit, linear, sequential monaural, PCM digital recording at a sampling rate of 32kHz, 44.1kHz, or 48kHz. Also called a DCAC, Digital Compact Audio Cassette. See also Digital Compact Cassette.

data compression : See compression(3).

data controller : A controller change message which is used to set some parameter in the receiving device, for example, the data increment and decrement switches on a synthesizer.

data dump : A packet of memory contents being transmitted from a sending device to a receiving device, usually in the form of MIDI System-Exclusive data, or stored in RAM. Also called a bulk dump or block transfer.

data slider : A pot fitted to a device such as a synthesizer which allows parameters within the device to be adjusted for programming, etc."

data thinning : A sequencer software feature which allows programs and/or devices to reduce the amount of MIDI data produced by continuous controllers such as pitch-bend, aftertouch, etc. This is accomplished by only keeping the continuous controller data when the parameter changes, as opposed to sending all bytes of data all of the time.

datafiler : A portable device for the replay of previously recorded MIDI data, used in live performances.

DAW : Digital Audio Workstation. See workstation.

dB : See decibel.

DB-9 connector : An industry-standard connector for serial machine control of professional audio and video transports. Developed by Sony, also called the Sony 9-pin.

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