Method and apparatus of postfiltering using a first spectrum par

Details Method and apparatus of postfiltering using a first spectrum par Method and apparatus of postfiltering using a first spectrum par

1995-08-21

1998-06-30

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704269, 704216, 704217, 704219, 704226, 704228, 704229, G10L 500, G10L 902, G10L 702

Patent

active

057748357

ABSTRACT:
A second spectrum parameter of which degree is lower than that of a first spectrum parameter is calculated based on the first spectrum parameter that is output from an encoder. A spectrum postfilter generates a transfer function having a denominator and a numerator wherein said first spectrum parameter is included in said denominator and said second spectrum parameter is included in said numerator, and filters the reduced signal with this transfer function. In addition, it adaptively generates a compensation coefficient based on the first and second parameters. A compensation filter generates a transfer function based the compensation coefficient and filters an output of the spectrum postfilter with this transfer function.

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patent: 5307441 (1994-04-01), Tzeng
Gerson et al., "Vector Sum Excited Linear Prediction (VSELP) Speech Coding At 8 KBPS", IEEE, pp. 461-4464, (1990).
Chen et al., "Real-Time Vector APC Speech Coding At 4800 BPS With Adaptive Postfiltering", IEEE, pp. 2185-2188, (1987).
Yelender,s. et al. "Low bit rate speech coding at 1.2 and 2.4 Kb/s." IEEE colloq. speech coding technique and application, 1992.
Hongmei Ai et al. "A 6.6 Kb/s CELP speech coder: high performance for GSM half-rate system." speech image processing, and neural networks, int'l symposium, 1994.

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