G - Physics – 11 – B
Patent
G - Physics
11
B
352/19
G11B 5/09 (2006.01) G11B 20/00 (2006.01) G11B 20/10 (2006.01) G11B 20/18 (2006.01)
Patent
CA 1214265
ABSTRACT OF THE DISCLOSURE In recording an analog signal using two recording heads equally-spaced on a rotating drum, a magnetic tape is wrapped about a guide drum over an angular extent of 90°, so that there are recording periods when a head is tracing the tape and periods when no head is tracing the tape. The analog signal to be recorded is converted to a pulse-code-modulated (PCM) digital signal in real-time periods which are longer than the recording periods during which a head traces the tape. The PCM signals are time-base compressed to be slightly less than the rotary head contact interval and additional data such as parity data and cyclic redundancy check codes are added to the PCM signals to form a composite signal, which is written back into a memory system. The time-base compressed composite signal is then read out repeatedly from the memory over one contact interval and supplied to the recording heads so that in the tracks formed by the heads on the tape the composite data appears more than once in each track, that is, slightly overlapped, thereby preventing dropouts and permitting the signal to be recorded on the tape by the head without accurately detecting the rotary phase of the recording head.
443841
Gowling Lafleur Henderson Llp
Sony Corporation
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