Speech coding system

Details Speech coding system Speech coding system

2006-05-23

2006-05-23

Dorvil, Richemond (Department: 2654)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

C704S229000

Reexamination Certificate

active

07050967

ABSTRACT:
In a speech coding system with an encoder and a decoder cooperating with said encoder, the speech encoder comprises a pre-processor and an ADPCM encoder with a quantizer and step-size adaptation means, while the speech decoder comprises an ADPCM decoder with similar step-size adaptation means as in the ADPCM encoder and with a decoder, and a post-processor. The quantizer is provided with storage means containing values for a correction factor α(c(n)) of the step-size Δ(n), said correction factor being dependent on the quantizer output signal c(n). The step-size adaptation occurs in accordance with the relation:Δ⁡(n+1)=Δ⁡(n)·A·{α⁡(c⁡(n))if⁢⁢α⁡(c⁡(n))<1α⁡(c⁡(n))+b⁢if⁢⁢Δ⁢⁢(n)·A·cmax<Δmax1otherwise⁢.

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