digital audio tape

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digital audio tape

magnetic tape on which sound is recorded digitally, giving high-fidelity reproduction

digital audio tape

[¦dij·əd·əl ′ȯd·ē·ō ‚tāp]
(computer science)
A magnetic tape on which sound is recorded and played back in digital form. Abbreviated DAT.

Digital Audio Tape

(storage, music)
(DAT) A format for storing music on magnetic tape, developed in the mid-1980s by Sony and Philips. As digital music was popularized by compact discs, the need for a digital recording format for the consumer existed. The problem is that digital music contains over 5 megabytes of data per minute before error correction and supplementary information. Before DAT, the only way to record digitally was to use a video or a reel-to-reel recorder.

DAT uses a rotary-head (or "helical scan") format, where the read/write head spins diagonally across the tape like a video cassette recorder. Thus the proper name is "R-DAT", where "R" for rotary distinguishes it from "S-DAT", a stationary design that did not make it out of the laboratories. Studio reel-to-reel decks are able to use stationary heads because they can have wider tape and faster tape speeds, but for the desired small medium of DAT the rotary-head compromise was made despite the potential problems with more moving parts.

Most DAT recorders appear to be a cross between a typical analog cassette deck and a compact disc player. In addition to the music, one can record subcode information such as the number of the track (so one can jump between songs in a certain order) or absolute time (counted from the beginning of the tape). The tape speed is much faster than a regular deck (one can rewind 30 minutes of music in 10-25 seconds), though not quite as fast as a compact disc player. DAT decks have both analog and digital inputs and outputs.

DAT tapes have only one recordable side and can be as long 120 minutes.

DAT defines the following recording modes with the following performance specifications...

2 channel 48KHz Sample rate, 16-bit linear encoding 120 min max. Frequency Response 2-22KHz (+-0.5dB) SN = 93 dB DR = 93 dB

2 channel 44.1Khz Sample rate, 16-bit linear encoding 120 min max Frequency Response 2-22KHz (+-0.5dB) SN = 93 dB DR = 93 dB

2 channel 32KHz Sample Rate, 12-bit non-linear encoding 240 min max Frequency Response 2-14.5KHz (+-0.5dB) SN = 92 dB DR = 92 dB

4 channel 32KHz (not supported by any deck)

DAT is also used for recording computer data. Most computer DAT recorders use DDS format which is the same as audio DAT but they usually have completely different connectors and it is not always possible to read tapes from one system on the other. Computer tapes can be used in audio machines but are usually more expensive. You can record for two minutes on each metre of tape.
References in periodicals archive ?
Vertices takes storage management systems to the next logical step and enables managers of large and growing, single- and multiple-site data centers to keep track of all computer media, including magnetic tape, disk, CD-ROM, Digital Linear Tape (DLT), Digital Versatile Disk (DVD), Digital Audio Tape (DAT), and other media regardless of the source.
BUSINESS WIRE)--May 5, 1998--Hewlett-Packard Company today announced plans to develop a high-capacity digital audio tape (DAT) drive using the new Digital Data Storage-4 (DDS-4) format, which was adopted recently by the DDS Manufacturers Group.
The company was also the first company in the world to manufacture Digital Audio Tape (DAT) products.
The interviews are mastered onto Digital Audio Tape.
IBM now has cost-effective offerings from 4GB to over 1 terabyte (1 TB = 1,050GB) in tape formats including Travan, Digital Audio Tape, 8mm and Digital Linear Tape.
The recorders will accept both analog input (such as records, tapes, or microphone input) and digital input (such as CD players, digital audio tapes, or Sony MiniDiscs).

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