Low-delay vector backward predictive coding of speech

Details Low-delay vector backward predictive coding of speech Low-delay vector backward predictive coding of speech

1989-06-01

1990-10-16

Kemeny, Emanuel S.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

381 35, 381 30, G10L 500

Patent

active

049630342

ABSTRACT:
A method of encoding speech sounds to facilitate their transmission to and reconstruction at a remote receiver. A transmitter and a receiver have identical filters and identical codebooks containing prestored excitation vectors which model quantized speech sound vectors. The speech sound vectors are compared with filtered versions of the codebook vectors. The filtered vector closest to each speech sound vector is selected. During the comparison, filtration parameters derived by backward predictive analysis of a series of previously selected filtered codebook vectors are applied to the filter. The transmitter sends the receiver an index representative of the location of the selected vector within the codebook. The receiver uses the index to recover the selected vector from its codebook, and passes the recovered vector through its filter to yield an output signal which reproduces the original speech sound sample. By applying the same backward predictive analysis technique employed by the transmitter to the same series of previously selected filtered codebook vectors to which the transmitter applied the technique, the receiver derives the same combination of filtration parameters which the transmitter applied to its filter while selecting the codebook vector corresponding to the transmitted index.

REFERENCES:
Makhoul, J., "Linear Prediction: A Tutorial Review", Proceedings of the IEEE, vol. 63, No. 4, Apr. 1975, pp. 561-580.
Widrow, B., et al., "Stationary and Nonstationary Learning Characteristics of the LMS Adaptive Filter", Proceedings of the IEEE, vol. 64, No. 8, pp. 1151-1161, Aug. 1976.
CCITT Recommendation G.721, "32 kb/s Adaptive Differential Pulse Code Modulation (ADPCM)", CCITT Red Book, Fascicle III.3, pp. 55-93, Oct. 1984.
Gray, R. M., "Vector Quantization", IEEE ASSP Magazine, vol. 1, pp. 4-29, Apr. 1984.
Linde, Y., Buzo, A., and Gray, R. M., "An Algorithm for Vector Quantizer Design", IEEE Transactions in Communications, vol. COM-28, Jan. 1980, pp. 84-95.
Cuperman, V., and Gersho, A., "Vector Predictive Coding of Speech at 16 kbit/s", IEEE Trans. on Comm., vol. COM-33, pp. 685-696, Jul. 1985.
Atal, B. S., Schroeder, M. R., "Code-Excited Linear Prediction (CELP): High-Quality Speech at Very Low Bit Rates", Proc. 1985 ICASSP, pp. 25.1.1-25.1.4.
Chen, J.-H., and Gersho, A., "Vector Adaptive Predictive Coding of Speech at 9.6 kb/s", Proc. 1986 ICASSP, 33.4.1-4.
Chen, J.-H., and Gersho, A., "Gain-Adaptive Vector Quantization with Application to Speech Coding", IEEE Trans. on Comm., No. 9, pp. 918-930, Sep. 1987.
Rabiner, L. R., Cheng, M. J., Rosenberg, A. E., McGonegal, C. A., "A Comparative Performance Study of Several Pitch Detection Algorithms", IEEE Trans. on ASSP, vol, ASSP-24, pp. 339-417, Oct. 1976.
Jerry Gibson, "Adaptive Prediction in Speech Differential Encoding Systems", Proc. IEEE, vol. 68, No. 4, Apr., 1980, pp. 488-525.
Watts, Lloyd & Cuperman, Vladimir, "Design of a 16 kbit/s Vector ADPCM Speech Coding Algorithm", Proc. Canadian Conf. on Electrical & Computer Engineering, Nov. 1988, Vancouver, Canada.
Watts, Lloyd & Cuperman, Vladimir, "A Vector ADPCM Analysis-by-Synthesis Configuration for 16 kibt/s Speech Coding" Proc. IEEE Global Telecommunications Conf., Nov.-Dec. 1988, pp. 275-279.

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