Data processing: speech signal processing – linguistics – language – Audio signal bandwidth compression or expansion – With content reduction encoding
Patent
1997-12-05
2000-04-11
Dorvil, Richemond
Data processing: speech signal processing, linguistics, language
Audio signal bandwidth compression or expansion
With content reduction encoding
704201, G10L 302
Patent
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.
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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.
Dorvil Richemond
Rohm & Co., Ltd.
Zintel Harold
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