Audio signal recording and reproducing apparatus utilizing digit

Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system

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G10L 702

Patent

active

049107801

ABSTRACT:
An audio signal recording and reproducing apparatus digitizes sound into an electric audio signal, data compresses the signal into compressed data to reduce information quantity, records the compressed data into a semiconductor memory, and reproduces an audio signal from the recorded data. The apparatus includes a plurality of input compression and output extension conversion tables which are used for compression conversion of input signal and extension conversion of output signal, respectively. Input compression and output extension conversion table selection counters are count-controlled by difference data representing the change of the audio signal. The apparatus selects one among a plurality of input compression and output extension conversion tables in accordance with count values of the selection counters. The conversion tables are arranged in sequence and contain successively larger ranges of values.

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patent: 4354273 (1982-10-01), Araseki et al.
patent: 4481659 (1984-11-01), Adoul
patent: 4540973 (1985-09-01), Grallert
patent: 4592070 (1986-05-01), Chow et al.
patent: 4805217 (1989-02-01), Morihiro et al.
Parsons, "Voice and Speech Processing", McGraw-Hill 1986, p. 230.

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