Acoustic signal transform coding method and decoding method havi

Details Acoustic signal transform coding method and decoding method havi Acoustic signal transform coding method and decoding method havi

1995-03-13

1997-11-04

MacDonald, Allen R.

395 21, 395 213, 395 228, 395 229, 395 267, 395 271, G10L 916

Patent

active

056849206

ABSTRACT:
An input acoustic signal is subjected to modified discrete cosine transform processing to obtain its spectrum characteristics. Linear prediction coefficients are derived from the input acoustic signal in a linear prediction coding analysis part, and the prediction coefficients are subjected to Fourier transform in a spectrum envelope calculation part to obtain the envelope of the spectrum characteristics of the input acoustic signal. In a normalization part the spectrum characteristics are normalized by the envelope thereof to obtain residual coefficients. Another normalization part normalizes the residual coefficients by a residual-coefficients envelope predicted in a residual-coefficients envelope calculation part, thereby obtaining fine structure coefficients, which are vector-quantized in a quantization part. A de-normalization part de-normalizes the quantized fine structure coefficients. The residual-coefficients envelope calculation part uses the reproduced residual coefficients to predict the envelope of residual coefficients of the subsequent frame.

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patent: 5293448 (1994-03-01), Honda
patent: 5473727 (1995-12-01), Nishiguchi et al.
patent: 5504832 (1996-04-01), Taguchi

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