Speech encoding and decoding method and speech encoding and deco

Details Speech encoding and decoding method and speech encoding and deco Speech encoding and decoding method and speech encoding and deco

1998-03-02

2000-06-20

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704223, G10L10110

Patent

active

06078881&

ABSTRACT:
Speech encoding using searching of a code book for a code that matches an input speech signal, and speech decoding using the code book are disclosed. A random series of code samples is stored in a buffer memory such as a ring buffer memory, and a basic vector generation unit generates basic vectors by applying an arbitrary shift to each of code series retrieved from the random series. Generation of the basic vectors may be performed according to, for example, an overlapping vector generation process. A code book generation unit extends the basic vectors contained in a basic vector unit according to a structuring process so as to produce a tree-structured delta code book. The basic vector generation unit may extend the basic vectors based on pitch parameters or a center clipping threshold.

REFERENCES:
patent: 5819213 (1998-10-01), Oshikiri
patent: 5864650 (1999-01-01), Taniguchi et al.
Kondoz, "Digital Speech" Wiley, 190-194, 1994.

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