Speech decoder capable of reproducing well background noise

Details Speech decoder capable of reproducing well background noise Speech decoder capable of reproducing well background noise

1994-12-07

1997-10-14

MacDonald, Allen R.

395 232, 395 234, G10L 302

Patent

active

056779852

ABSTRACT:
When background noise is superposed on speech, a speech decoder can well represent the background noise through signal processing only in the speech decoder even at low bit rates. In the speech decoder, a decoding circuit receives a signal from a speech coder, a speech detecting circuit detects non-speech and speech intervals, and a excitation signal calculating circuit calculates a excitation signal using a sound source signal, a pitch period, and an average amplitude. A signal reproducing circuit drives a filter composed of a spectrum parameter to reproduce a sound signal. A searching circuit stores a set of random number code vectors of a predetermined bit number as a code book, and searches the code book for a best random number code vector which is selected. A second signal reproducing circuit reproduces a sound signal (noise) using the selected random number code vector.

REFERENCES:
patent: 5208862 (1993-05-01), Ozawa
patent: 5265167 (1993-11-01), Akamine et al.
patent: 5307441 (1994-04-01), Tzeng
Schroeder, Manfred R., "Code-Excited Linear Prediction (CELP): High-Quality Speech at Very Low Bit Rates", Proc. ICASSP, 1985, pp. 937-940.
Lynch, Jr., J. F. et al., "Speech/Silence Segmentation for Real-Time Coding Via Rule Based Adaptive Endpoint Detection", Proc. ICASSP, 1987, pp. 1348-1351.
Sugamura et al., "Quantizer Design in LSP Speech Analysis-Synthesis", IEEE Journal on Selected Areas in Communications, vol. 6, No. 2, Feb. 1988, pp. 433-440.

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