Dynamic magnetic information storage or retrieval – Monitoring or testing the progress of recording
Patent
1991-02-19
1994-02-01
Pascal, Robert J.
Dynamic magnetic information storage or retrieval
Monitoring or testing the progress of recording
360 51, 360 48, G11B 2736, G11B 509
Patent
active
052837009
ABSTRACT:
A recording apparatus for selectively recording, on a recording medium, a plurality of kinds of digital main information signals having different data rates is arranged to generate a digital additional information signal related to the recorded digital main information signal, to record the additional information signal on the recording medium along with the digital main information signal, and to obtain a clock signal for the operation of an additional information generating circuit by frequency-dividing one of different clock signals used for main information generating circuits. The arrangement requires only one additional information generating circuit to minimize the scale of circuit arrangement for reduction in size and weight of the recording apparatus. A reproducing apparatus for reproducing digital main information signals from a recording medium on which the digital main information signals of different data rates are selectively recorded together with the digital additional information signal related thereto is arranged to generate a clock signal for an additional information processing circuit for reproducing the digital additional information signal by frequency-dividing one of clock signals applied to main information processing circuits for processing digital main information signals reproduced. The size and weight of the apparatus can be reduced as the circuit arrangement requires only one additional information processing circuit.
REFERENCES:
patent: 4791497 (1988-12-01), Nakano et al.
patent: 4807055 (1989-02-01), Tsunoda et al.
patent: 4858035 (1989-08-01), Hikawa
patent: 5130863 (1992-07-01), Yamashita et al.
Nagasawa Kenichi
Takahashi Koji
Canon Kabushiki Kaisha
Neyzari Ali
Pascal Robert J.
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