Methods of efficiently recording an audio signal in semiconducto

Details Methods of efficiently recording an audio signal in semiconducto Methods of efficiently recording an audio signal in semiconducto

1993-04-14

1996-02-27

Moore, David K.

Electrical audio signal processing systems and devices

Hearing aids, electrical

Specified casing or housing

395 2, 395 235, 381 29, G10L 302, G10L 900

Patent

active

054955521

ABSTRACT:
An audio signal is recorded in a semiconductor memory in a plurality of hierarchical levels, with the lowest level being adequate for reproduction with a certain reduced degree of fidelity. Successively higher hierarchial levels provide successively greater fidelity when reproduced. When the memory has been determined to have reached maximum capacity, recording continues by overwriting the highest hierarchical level of data currently stored in the memory with lower hierarchical levels of new data. A code is recorded in the memory, indicating the number of hierarchical levels recorded therein, for subsequent reproduction. The audio signal can furthermore be recorded in variable-length frames and reproduced at high speed by reading every N-th frame, N being a positive integer, or by reading only frames having at least a certain minimum length.

REFERENCES:
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patent: 5341457 (1994-08-01), Hall, II et al.
Tan et al, "Digital audio tape for data storage"; IEEE Spectrum, vol. 26, iss. 10, pp. 34-38, Oct. 1989.
Takahashi, "Digital still hdtv disc system"; IEEE Transactions on Consumer Electronics, vol. 34, iss. 1, pp. 64-71, Feb. 1988.
Von Jochen Meyer; "Realization of Hierarchical Language-Networks" (Realisierung einer Hierarchie aus Sprachnetzwerken); 1990; pp. 200-207.

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