Dynamic magnetic information storage or retrieval – Recording for changing duration – frequency or redundant...
Patent
1984-08-24
1986-10-28
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
Recording for changing duration, frequency or redundant...
360 73, G11B 500, G11B 1546
Patent
active
046202382
ABSTRACT:
For both recording and replay, a digital audio tape (14) is accelerated very rapidly by a motor servo (9), motor (8) and capstan (7) so that the tape speed overshoots nominal speed range before settling back to this range in an oscillatory manner. The digital samples are recorded and replayed via a head (15), a random access memory (16) and input/output electronics (19). During recording, the store (17) is precharged by starting to write in as soon as acceleration is initiated. Read-out to the tape is initiated as soon as the tape first reaches the nominal speed range. Uniformity of samples as recorded on the tape is preserved by clocking a read address generator (21) at a rate proportional to tape speed, signaled by a tachometer (7). The write address generator is clocked at the constant sampling rate. For replay the write address generator is clocked at the tape speed rate while the read address generator (21) is clocked at the constant sample rate. Write in and read out are both initiated when the tape speed first reaches the nominal range. The addresses provided by the generators (20 and 21) are compared by a comparator (22) which provides a reference signal to the servo (9) in an arrangement such as to adjust the tape speed always in the sense to maintain a constant degree of filling of the store (17).
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"Variable Velocity Constant Density Magnetic Tape Recording" by F. Kost et al., IBM TDB, vol. 12, #7, 12/69.
Gaskell Philip S.
Lagadec Roger
McNally Guy W. W.
Canney Vincent P.
O'Connell Robert F.
Willi Studer AG
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