Method and system for transmitting variable rate speech signal

Details Method and system for transmitting variable rate speech signal Method and system for transmitting variable rate speech signal

1988-02-12

1990-02-20

Kemeny, E. S.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

381 31, 375122, G10L 500

Patent

active

049033018

ABSTRACT:
A speech signal transmission system for transmitting coded speech signals with variable bit rate is disclosed, which comprises a coder for analyzing digital speech signals inputted in a one-frame period and transforming them into coded data comprising a plurality of parameters indicating characteristics of the inputted speech signals, a data arranging circuit for arranging the coded data outputted by the coder in the order of the priority in the decoding of the speech signals and outputting them, and a bit stealer allowing a series of coded data outputted successively by the data arranging circuit to pass through only in a period of time determined by the transmission bit rate. The bit arranging circuit outputs the parameters in the order of the priority of decomposes each of them in unit of a bit and outputs them with decreasing priority. Parameters or bits of low priority are omitted by the bit stealer, depending on the transmission bit rate. One the receiver side the parameters are extracted and the speech signals are decoded on the basis of arrangement type identification codes transmitted together with the coded data.

REFERENCES:
patent: 4095052 (1978-06-01), Ching et al.
patent: 4617676 (1986-10-01), Jayant
patent: 4726037 (1988-02-01), Jayant
IEEE ASSP Magazine, vol. 1, No. 2, (1984), pp. 4-29, "Vector Quantization".
"The Residual Excited Linear Prediction Vocoder with Transmission Rate Below 9.6 KBPS", by C. K. Un and D. T. Megill, IEEE Trans. 1975.
"A New Model of LPC Excitation for Producing Natural Sounding Speech at Low Bit Rates", by B. S. Atal et al., Processing ICASSP 82 (1982).
"Bit Allocation in Time and Frequency Domains for Predictive Coding of Speech", by M. Honda et al., IEEE Trans. Acoustics Speech . . . 1984.
The Bell System Technical Journal, vol. 58, No. 3, Mar. 1979, pp. 577-600.
Technical Research Report of the Institute of Electronics Communication Engineers of Japan, SP86-48, (1986), pp. 31-38.
Foundation of Speech Information Processing, by Kazuo Nakata, Ohm Publishing Co., (1981).

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