Dynamic magnetic information storage or retrieval – Converting an analog signal to digital form for recording;...
Patent
1988-12-15
1991-04-23
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
Converting an analog signal to digital form for recording;...
G11B 509
Patent
active
050104217
ABSTRACT:
A sound reproducing apparatus converts a sound signal reproduced in a 5 multiple speed reverse reproduction mode into a digital signal by pulses obtained by frequency-multiplying reference sampling pulses by 5 to write the digital signal in a memory 12, and reads out the digital signal by the reference sampling pulses to convert the same to an analog signal. Reading of the signal from memory 12 is performed in response to a read address changed in one direction in a predetermined cycle. Writing of a signal to the memory 12 is performed by using address information changed in the direction opposite to that of the read address signal at a speed five times that of a read address signal as a write address in a cycle corresponding to five-sixth of the cycle of the read address signal and only during a period corresponding to one-sixth of the cycle thereof. Thus, writing is performed with the address being reversed, so that a reproduced sound signal which is considerably long continuous can be derived without interruption even in the reverse reproduction mode.
REFERENCES:
patent: 4853803 (1989-08-01), Fukatsu
Canney Vincent P.
Sanyo Electric Co,. Ltd.
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