Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data in specific format
Patent
1987-09-28
1988-10-25
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data in specific format
360 73, G11B 509, G11B 1546
Patent
active
047807717
ABSTRACT:
A high density signal recording and reproducing apparatus comprises a disc drive comprising for recording and reproducing with an existing recording format a digital signal on and from a disc rotating at a rotational speed which is 1/N times a standard rotational speed, a circuit for generating N index pulses in one revolution time period of the disc, a selecting circuit for generating a selecting instruction which selects and designates an arbitrary track part on and from which the digital signal is to be recorded and reproduced out of N track parts of one track, a circuit responsive to the selecting instruction for generating a switching signal and an operation stop signal for stopping a recording or reproducing operation of the disc drive during a scanning period in which the remaining N-1 track parts excluding the arbitrary track part are scanned, and for passing out of the N index pulses in one revolution time period of the disc only one index pulse corresponding to the arbitrary track part, and a circuit responsive to the switching signal for selectively passing and supplying the reproduced digital signal to the selecting circuit only during a time period in which the digital signal is reproduced from the arbitrary track part.
REFERENCES:
patent: 4314287 (1982-02-01), Freeman et al.
patent: 4357635 (1982-11-01), Hasegawa
Kaneko Keiichi
Miyazaki Ken
Canney Vincent P.
Victor Company of Japan Ltd.
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