Multi-pulse coding apparatus with a reduced bit rate

Details Multi-pulse coding apparatus with a reduced bit rate Multi-pulse coding apparatus with a reduced bit rate

1989-10-13

1991-02-05

Shaw, Dale M.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

G10L 702

Patent

active

049912151

ABSTRACT:
An input speech signal is converted into sampled data with a first sampling frequency in each of a plurality of analysis frames. The sampled data are produced as filtered data through a digital filter having a high cut-off frequency smaller than the highest frequency of the speech signal. The filtered data are decimated into decimated signals which are sampled at a second sampling frequency smaller than the first sampling frequency and which are used to develop multi-pulses representative of an exciting source information of the input speech signal. Each of the analysis frames is divided into a plurality of subframes. At most one multi-pulse is developed in one subframe and the other multi-pulses are subsequently developed for the subframes other than the subframe where the one multi-pulse has been developed.

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Rabiner et al., "Digital Processing of Speech Signals", Prentice-Hall, 1978, pp. 26-31.
Kroon et al., "Experimental Evaluation of Different approaches to the Multi-pulse Coder", ICASSP 84, 10.4.1-10.4.4.
Sharad et al., "Inproving Performance of Multi-Pulse LPC Coders Low Bit Rates", ICASSP 84, pp. 1.3.1-1.3.4.
Berouti et al., "Efficient Computation and Encoding of the Multipulse Excitation for LPC", ICASSP 84, pp. 10.1.1-10.1.4.

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