Data compression system and method for audio signals

Details Data compression system and method for audio signals Data compression system and method for audio signals

1987-08-25

1988-06-28

Kemeny, Emanuel S.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

360 51, G10L 500, G11B 509

Patent

active

047544830

ABSTRACT:
A data reduction system is disclosed which includes an analog to digital converter for converting an analog signal to digital sample signal form, a digital compression filter for compression filtering the digital sample signals, and an encoder for truncated Huffman encoding the compression filter output. A decoder for decoding the encoded signal, a digital reconstruction filter for decomposition filtering of the decoded signal, and digital to analog converter means are included to reconstruct the analog signal. The digital compression filter has a transfer function which includes zeros as the unit circle in the Z-plane, while the digital reconstruction filter has poles that normally are on or inside the unit circle in the Z-plane at the same angular positions as the zeros of the digital compression filter. The poles of the reconstruction filter are momentarily movable inwardly from their normal positions in response to a detected error signal to speed recovery from such error signal.

REFERENCES:
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Bertrand et al, "Microprocessor Application . . . ", Proc. IEEE, May, 1977, pp. 714-722.
Ruttiman et al, "Compression of the ECG . . . ", IEEE Trans. Biomed. Eng., Nov. 1979, pp. 613-623.
Ripley et al, "A Computer System . . . ", Biomed. Lab., Washington U. (MO), 1976, pp. 439-445.

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