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Entries found for search: DAT

ADAT : Alesis Digital Audio Tape. A second-generation (1992) MDM. An 8-track, S-VHS-based digital audio recorder. Like the Tascam DA-88, ADAT systems record digital audio on consumer videocasette formats and provide for interlocking up to 16 8-track, rack-mount recorders in sample-accurate (48kHz) sync for up to 128-track recording. ADAT is a 16-bit format, currently supported as well by Panasonic, using T-180 S-VHS tape. ADAT-II is a newly proposed 20-bit S-VHS format used by newer Alesis and Studer 8-track recorders. See also DTRS.

R-DAT : Rotary-head Digital Audio Tape: A standard for digital audio tape recording which employs a rotating head mechanism similar to that of video recorders. Two channels of 16-bit digital audio information, plus subcode and track information, can be recorded onto a tape ap-proximately 3mm wide, traveling at a very low speed of about 50 cpm. The tape is housed in a case similar to a video cassette, though much smaller. R-DAT machines offer three sampling rates: 32kHz, 44.1kHz, and 48kHz. Maximum continuous record time for a cassette is two hours at standard play and four hours at long play, with reduced quality. See also DAT.

metadata : Generically, parameters which apply globally to a particular data transmission, as opposed to the data actually carried in the transmission. These data usually include type of codec, number of channels, channel format, originating node information (in a network context), type of data encryption, etc. In Dolby Digital , metadata specifically refers to the parameters which travel alongside the audio in the Dolby Digital stream as auxiliary data. The metadata here provides scalable decoding information about the audio which can be interpreted in different ways by different receivers, allowing a producer to tailor a program’s mix to the playback environment without requiring the medium to store multiple versions, e.g., a 5.1 mix and a stereo mix.

simulDAT : A DAT recording made during a Telecine transfer in which the production audio is transferred to a DAT whose timecode matches that of the videotape.

S-DAT : Stationary-head Digital Audio Tape. A bi-directional cassette tape designed for domestic digital recording. The head is stationary, as opposed to the rotating head of R-DAT. The tape speed is very low compared to professional stationary-head systems, such as DASH. The required data rate for stereo operation is achieved by distributing the 16-bit data over 20 data tracks in each direction. The sample rates are the same as for R-DAT, but 4-channel recording is possible at 32kHz with 12-bit nonlinear operation. S-DAT is not compatible with DCC as the latter does not conform to the S-DAT standard. See DAT.

update mode : In console automation, the operating mode in which previously written automation data is read back to its respective input faders for alteration by the engineer. The position of each fader at the beginning of an update take is defined by the system as its null-point. If the engineer leaves these faders at their initial levels throughout the take, no data will be changed. Any fader movement above or below a null point is read in dBindB, and that track’s data changed to reflect the same dBsamedB change from the previously written signal level. This updated data is then stored for later use.

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.

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

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.



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