Code conversion method, apparatus, program, and storage medium

Details Code conversion method, apparatus, program, and storage medium Code conversion method, apparatus, program, and storage medium

2002-11-12

2009-12-08

Lerner, Martin (Department: 2626)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

C704S221000, C704S223000, C370S466000

Reexamination Certificate

active

07630884

ABSTRACT:
The object of this invention is converting a code that has been obtained by encoding speech by one particular system is converted to code that can be decoded by another system with high speech quality, and moreover, with a low computational load in transmitting speech signal between different systems. This invention comprising an adaptive codebook (ACB) delay search range control circuit (1250in FIG.7) for calculating a search range control value from first adaptive codebook delay that is stored and held and said second adaptive codebook delay that is stored and held, and an adaptive codebook encoding circuit (1220in FIG.7) for calculating autocorrelation using speech signal from ACB delay including excitation signal and delay that is within a range stipulated by said search range control value, and selects the maximum autocorrelation as second adaptive codebook delay, and supplying code that corresponds to said second adaptive codebook delay as code of an adaptive codebook delay in said second code string.

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