Mode-specific method and apparatus for encoding signals containi

Details Mode-specific method and apparatus for encoding signals containi Mode-specific method and apparatus for encoding signals containi

1995-10-11

1997-01-21

MacDonald, Allen R.

395 219, 395 228, 395 271, 395 277, G10L 912, G10L 914

Patent

active

055966764

ABSTRACT:
A method for encoding a signal that includes a speech component is described. First and second linear prediction windows of a frame are analyzed to generate sets of filter coefficients. First and second pitch analysis windows of the frame are analyzed to generate pitch estimates. The frame is classified in one of at least two modes, e.g. voiced, unvoiced and noise modes, based, for example, on pitch stationarity, short-term level gradient or zero crossing rate. Then the frame is encoded using the filter coefficients and pitch estimates in a particular manner depending upon the mode determination for the frame, preferably employing CELP based encoding algorithms.

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ICC'93, 23 May 1993, Geneva pp. 406-409 P. Lupini et al. `A multi-mode variable rate CELP coder based on frame classification` see the whole document.
ICASSP 90, vol. 1, 3 Apr. 1990, Albuquerque pp. 477-480 T. Tanguichi et al. `Combined source and channel coding based on multimode coding` see p. 477 left column, paragraph 1-right column, paragraph 2 see Fig. 1,2.
Atal et al., "A Pattern Recognition Approach to Voiced-Unvoiced-Silence Classification With Applications to Speech Recognition," IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-24, No. 3, Jun. 1976.
Rabiner et al., "Application of an LPC Distance Measure to the Voiced-Unvoiced-Silence Detection Problem," IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-25, No. 4, Aug. 1977.

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