Method and apparatus for high performance low bit-rate...

Details Method and apparatus for high performance low bit-rate... Method and apparatus for high performance low bit-rate...

2007-03-13

2007-03-13

Azad, Abul K. (Department: 2626)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

C704S222000

Reexamination Certificate

active

11066356

ABSTRACT:
A low-bit-rate coding technique for unvoiced segments of speech, without loss of quality compared to the conventional Code Excited Linear Prediction (CELP) method operating at a much higher bit rate. A set of gains are derived from a residual signal after whitening the speech signal by a linear prediction filter. These gains are then quantized and applied to a randomly generated sparse excitation. The excitation is filtered, and its spectral characteristics are analyzed and compared to the spectral characteristics of the original residual signal. Based on this analysis, a filter is chosen to shape the spectral characteristics of the excitation to achieve optimal performance.

REFERENCES:
patent: 5615298 (1997-03-01), Chen
patent: 5651091 (1997-07-01), Chen
patent: 5909663 (1999-06-01), Iijima et al.
patent: 6047253 (2000-04-01), Nishiguchi et al.

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