Data processing: speech signal processing – linguistics – language – Audio signal time compression or expansion
Patent
1994-03-08
1998-06-02
MacDonald, Allen R.
Data processing: speech signal processing, linguistics, language
Audio signal time compression or expansion
704201, 704229, G10L 908, H03M 730
Patent
active
057616426
ABSTRACT:
A device for recording and/or reproducing or transmitting and/or receiving compressed data includes decoding circuits 31 to 33 for performing expansion during the compression process is disclosed. An error produced during the compression process is calculated by an input/output error calculating circuit 41 from the input data and data compressed by adaptive bit allocation encoding circuits 22 to 24 and expanded by the decoding circuits 31 to 33, and bit allocation is again calculated on the basis of the error produced during the compression process, with the input data remaining as it is. The bit allocation re-calculated in this manner is quantized by the encoding circuits 22 to 24. Besides, data annulling the error produced during the compression process is formulated by the input/output error calculating circuit 41 and summed to the input signals for subsequent quantization. Compressed signals suited to the input signals may be obtained even if the model for the auditory sense or constants occasionally employed are not suited to the input signals, or if the input signals are unanticipated signals.
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Polyphase Quadrature Filters--A New Subband Coding Technique, Rothweiler, ICASSP Apr. 14, 15 and 16, 1983, Boston, vol. 3, pp. 1280-1283.
Subband/Transform Coding Using Filter Bank Designs Based on Time Domain Aliasing Cancellation, Princen et al., ICASSP 1987 IEEE, pp. 2161-2164.
Akagiri Kenzo
Mitsuno Makoto
Shimoyoshi Osamu
Suzuki Hiroshi
Dorvil Richemond
MacDonald Allen R.
Sony Corporation
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