Apparatus for linear predictive coding and decoding of speech us

Details Apparatus for linear predictive coding and decoding of speech us Apparatus for linear predictive coding and decoding of speech us

1990-04-19

1992-02-25

Kemeny, Emanuel S.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

381 38, G10L 702

Patent

active

050919440

ABSTRACT:
A speech coding and decoding apparatus for use in linear predictive coding of a speech signal includes coding apparatus having a pitch analyzing element for separating an analysis frame into one or more blocks and calculating the strength of correlativity between pitch periods of a residual waveform in each block. A residual partially compresing element compresses the time axis of the residual waveform in a block having a high correlativity strength. A residual quantizing element quantizes the compressed residual waveform while preferentially allotting quantization allotment bits to the compressed portion of the residual waveform. Decoding apparatus includes a residual inverse quantizing element for inversely quantizing the residual waveform by the same bit allotment. A residual partially expanding element expands the compressed portion of the residual waveform to its original length and supplies it to a linear predictive synthesis filter.

REFERENCES:
patent: 4220819 (1980-09-01), Atal
patent: 4720861 (1988-01-01), Bertrand
patent: 4797926 (1989-01-01), Bronson et al.
patent: 4827517 (1989-05-01), Atal et al.
patent: 4985923 (1991-01-01), Ichikawa et al.
Cox et al., "An Implementation of Time Domain Harmonic Scaling With Application to Speech Coding", IEEE, 1982, pp. 4G.1.1-4G.1.4.

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