Speech signal coding and decoding system transmitting allowance

Details Speech signal coding and decoding system transmitting allowance Speech signal coding and decoding system transmitting allowance

1992-02-20

1994-06-28

Fleming, Michael R.

G10L 900

Patent

active

053254619

ABSTRACT:
A speech signal coding apparatus inputs a pitch period generated by coding a speech signal, and outputs information on a range for said pitch period, together with the pitch period. A speech signal decoding apparatus inputs the pitch period and the above information on the range, and determines whether or not the pitch period is within the range. When the pitch period is determined to be within the range, the speech signal decoding apparatus outputs the above pitch period. When the pitch period is determined not to be within the range, the speech signal decoding apparatus outputs as a pitch period a predetermined value within the range.

REFERENCES:
patent: 3676595 (1972-07-01), Dolansky et al.
patent: 4809334 (1989-02-01), Bhaskar
patent: 4985923 (1991-01-01), Ichikawa et al.
Kroon et al., "A class of Analysis-by-Synthesis Predictive Coders for High Quality Speech Coding at Rates Between 4.8 and 16 Kbits/s", IEEE Journal on Selected Areas in Communications, vol. 6, No. 2, Feb. 1988, pp. 353-363.
Kroon et al., "On Improving the Performance of Pitch Predictors in Speech Coding Systems", Advances in Speech Coding, Kluwer Academic Publishers, Nov. 1991, pp. 321-327.
Cox et al, "Robust CELP coders for noisy backgrounds and noisy channels", International Conference on Acoustics Speech and Signal Processing, pp. 739-742, May, 1989.
Nichols, "Pitch-learning algorithm for speech encoders", Journal of the Acoustical Society of America, pp. 2289-2290, Dec., vol. 84, No. 6, 1988.

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