Voice coder

Details Voice coder Voice coder

2005-12-06

2005-12-06

Dorvil, Richemond (Department: 2654)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

C704S205000, C704S223000, C704S229000, C704S230000

Reexamination Certificate

active

06973424

ABSTRACT:
A speech coder capable of achieving an excellent sound quality even at a low bit rate. A mode judging circuit800of the speech coder judges a mode by the use of a feature quantity of an input speech signal for each subframe. In case of a predetermined mode, an excitation quantization circuit350searches combinations of every code vectors stored in codebooks351and352for simultaneously quantizing amplitudes or polarities of a plurality of pulses and each of a plurality of shift amounts for temporally shifting predetermined pulse positions, and selects a combination of the code vector and the shift amount which minimizes distortion from an input speech. A gain quantization circuit365quantizes a gain by the use of a gain codebook380.

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