Coding apparatus having adaptive coding at different bit rates a

Details Coding apparatus having adaptive coding at different bit rates a Coding apparatus having adaptive coding at different bit rates a

1995-09-29

1999-03-02

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704209, 704221, 704216, 704219, G10L 504

Patent

active

058783873

ABSTRACT:
The coding apparatus comprises an adaptive codebook storing excitation signals as vectors, a synthesis filter for forming a synthesis signal, referring to the vectors stored in the adaptive codebook, a similarity computation circuit for computing a similarity between the synthesis signal obtained by the synthesis filter and a target signal, and a coding scheme determining circuit for deciding one coding scheme from a plurality of coding schemes respectively having coding bit rates different from each other, on the basis of the similarity obtained by the similarity computation circuit.

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