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...

2005-09-20

2005-09-20

Azad, Abul K. (Department: 2654)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

C704S226000, C704S219000

Reexamination Certificate

active

06947888

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: 5293449 (1994-03-01), Tzeng
patent: 5734789 (1998-03-01), Swaminathan et al.
patent: 5909663 (1999-06-01), Iijima et al.
patent: 6047253 (2000-04-01), Nishiguchi et al.
patent: 6148282 (2000-11-01), Paksoy et al.
patent: 6480822 (2002-11-01), Thyssen
patent: 2001/0049598 (2001-12-01), Das
Das et al., “Multimode Variable Bit Rate Speech Coding: An Efficient Paradigm for High-Quality Low-Rate Representation of Speech Signal,” Acoustics, Speech, and Signal Processing, 1999. IEEE International Conference in Phoenix, AZ, Mar. 15-19, 1999; Piscataway, NJ, Mar. 15, 1999, pp. 2307-2310.

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