Rate selection method for selectable mode vocoder

Details Rate selection method for selectable mode vocoder Rate selection method for selectable mode vocoder

2006-05-30

2006-05-30

Young, W. R. (Department: 2655)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

C704S221000, C704S201000

Reexamination Certificate

active

07054809

ABSTRACT:
There is provided rate selection methods and systems for selecting coding rates for coding frames of a speech signal to realize an average bit rate indicated by a mode. For example, a mode 0, mode 1, and a mode 2 may be defined, with each mode requiring a different average bit rate. To achieve the average bit rate of a particular mode, a coding rate is selected for each frame of the speech signal, based on the characteristics of a frame. A frame can be categorized in a class, such as noise or silence, noise-like unvoiced speech, pulse-like unvoiced speech, transition into voiced speech, unstable voiced speech, stable voiced speech. Other parameters may also be used, such as the sharpness, noise-to-signal ratio, pitch correlation, energy, and reflection coefficient. A frame may then be coded at a full-rate, a half-rate, a quarter-rate, or an eighth-rate.

REFERENCES:
patent: 5414796 (1995-05-01), Jacobs et al.
patent: 5778338 (1998-07-01), Jacobs et al.
patent: 6691084 (2004-02-01), Manjunath et al.
Telecommunications Industry Association, TIA/EIA/IS-127: Enhanced Variable Rate Codec, Speech Service Option 3 for Wideband Spread Spectrum Digital Systems, 1997, 1998, 1999, 2001, pp. 4-21 to 4-28.

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