Digital speech processing system having reduced encoding bit req

Details Digital speech processing system having reduced encoding bit req Digital speech processing system having reduced encoding bit req

1982-09-23

1986-10-21

Kemeny, E. S. Matt

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

G10L 500

Patent

active

046189823

ABSTRACT:
A digitized speech signal is divided into sections and each section is analyzed by the linear prediction method to determine the coefficients of a sound formation model, a sound volume parameter, information concerning voiced or unvoiced excitation and the period of the vocal band base frequency. In order to improve the quality of speech without increasing the data rate, redundance reducing coding of the speech parameters is effected. The coding of the speech parameters is performed in blocks of two or three adjacent speech sections. The parameters of the first speech section are coded in a complete form, and those of the other speech sections in a differential form or in part not at all. The average number of bits required per speech section is reduced to compensate for the increased section rate, so that the overall data rate is not increased.

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S. Chandra and W. C. Lin, "Linear Prediction with a Variable Analysis Frame Size", IEEE Transactions on Acoustics, Speech and Signal Processing, vol. ASSP-25, No. 4, pp. 322-330, Aug. 1977.
C. K. Un and D. Thomas Magill, "The Residual-Excited Linear Prediction Vocoder with Transmission Rate Below 9.6 kbits/s", IEEE Transactions on Communications, vol. COMM-23, No. 12, Dec. 1975.
S. Maitra and C. R. Davis, "Improvements in the Classical Model for Better Speech Quality", IEEE International Conference on Acoustics, Speech, and Signal Processing, vol. 1 of 3, pp. 23-28, Apr. 1980.
E. M. Hofstetter, "Microprocessor Realization of a Linear Predictive Vocoder", IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-25, No. 5, pp. 379-387, Oct. 1977.

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