Voice recording and reproducing apparatus using multiple ADPCM c

Data processing: speech signal processing – linguistics – language – Audio signal bandwidth compression or expansion – With content reduction encoding

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704201, G10L 302

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active

060497718

ABSTRACT:
An apparatus carries out an adaptive pulse code modulation process on voice data and records them in a solid memory which is detachably attached to the apparatus. The code bit number is switched, depending on the selected recording mode. A filter for suppressing a high-voice region of the frequency band of the voice data is used, and there is provided a selector for applying this filter at the time of voice reproduction selectively either always or according to the code bit number.

REFERENCES:
patent: 4549304 (1985-10-01), Weirich et al.
patent: 4726037 (1988-02-01), Jayant
patent: 4751736 (1988-06-01), Gupta et al.
patent: 5511000 (1996-04-01), Kaloi et al.
patent: 5530750 (1996-06-01), Akagiri
patent: 5570308 (1996-10-01), Ochi
Ramamoorthy "Enhancement of ADPCM speech by adaptive postfiltering" ATT Tech Jour pp. 1465-1475, Oct. 1984.
Cummisket et al "Adaptive quantization in differential PCM coding of speech" ATT Tech Jour pp.1105-1118, Mar. 12, 1973.
CCITT "Recommendation G.726", Dec. 1990.

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