Speech coding system to reduce distortion through signal overlap

Details Speech coding system to reduce distortion through signal overlap Speech coding system to reduce distortion through signal overlap

1994-03-14

1997-01-28

MacDonald, Allen R.

395 228, G10L 900

Patent

active

055985041

ABSTRACT:
An adaptive codebook having excitation signal predetermined in the past, an excitation codebook for vector quantizing an excitation signal of the input speech signal and a gain codebook for vector quantizing gains of the adaptive and excitation codebooks are provided. A perceptually weighted speech signal having a subframe length obtained by dividing the frame is developed by using the input speech signal and the spectral parameters. A zero input signal of a synthesis filter is developed for a predetermined length by providing the input speech signal of the present subframe as an initial value to the synthesis filter on the basis of the spectral parameters. An overlap signal is also developed by weighting the zero input signal on the basis of the spectral parameters. Optimal codevectors are searched from the adaptive, excitation and gain codebooks according to a signal obtained by connecting the overlap signal to the trailing end of the perceptually weighted speech signal.

REFERENCES:
patent: 5265190 (1993-11-01), Yip et al.
W. B. Kleijn et al., "Improved Speech Quality and Efficient Vector Quantization in SELP", Proc. ICASSP for Acoustic, Speech and Signal Processing, 1988 IEEE, pp. 155-158.
M. R. Schroeder et al., "Code-Excited Linear Prediction (CELP): High-Quality Speech at Very Low Bit Rates", Proc. ICASSP for Acoustic, Speech and Signal Processing, 1985 IEEE, pp. 937-940.
W. P. LeBlanc et al., "Structured Codebook Design in CELP", International Mobile Satellite Conference, Ottawa, 1990, pp. 667-672.
I. M. Trancoso et al., "Efficient Search Procedures for Selecting . . . in Stochastic Coders", IEEE Transactions on Acoustics, Speech, & Signal Processing, vol. 38, No. 3, Mar. 1990, pp. 385-396.
T. Miyano et al., "Improved 4.8kb/s CELP Coding Using Two-Stage Vector Quantization with Multiple Candidates (LCELP)", 1992 IEEE, pp.I-321 to I-324.

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