Voice over bandwidth constrained lines with mixed excitation...

Details Voice over bandwidth constrained lines with mixed excitation... Voice over bandwidth constrained lines with mixed excitation...

2005-07-12

2005-07-12

Chawan, Vijay B. (Department: 2654)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

C704S230000, C704S229000

Reexamination Certificate

active

06917914

ABSTRACT:
Vector quantization techniques reduce the effective bit rate to 600 bps while maintaining intelligible speech. Four frames of speech are combined into one frame. The system uses mixed excitation linear prediction speech model parameters to quantized the frame and achieve a fixed rate of 600 bps. The system allows voice communication over bandwidth constrained channels.

REFERENCES:
patent: 5806027 (1998-09-01), George et al.
patent: 6122608 (2000-09-01), McCree
patent: 6463407 (2002-10-01), Das et al.
patent: 2003/0065506 (2003-04-01), Adut
patent: 06-222796 (1993-01-01), None
McCree et al (“A Mixed Excitation LPC Vocoder Model For Low Bit Rate Speech Coding”, IEEE Transactions on Speech and Audio Processing, Jul. 1995).
Yeldener et al (“A Mixed Sinusoidally Excited Linear Prediction Coder At 4 Kb/S And Below”, IEEE International Conference on Acoustics, Speech, & Signal Processing, May 1998).

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