Methods of efficiently recording and reproducing an audio signal

Details Methods of efficiently recording and reproducing an audio signal Methods of efficiently recording and reproducing an audio signal

1998-05-15

1999-01-26

Dorvil, Richemond

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704201, 704203, 704230, 369 48, 369 59, 369 60, G10L 500

Patent

active

058648011

ABSTRACT:
An audio signal is recorded in a semiconductor memory in a plurality of hierarchical levels, with the lowest level sufficing for reproduction with a certain reduced degree of fidelity. Successfully higher hierarchical 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.

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