Method and apparatus for low bit rate speech coding detection

Details Method and apparatus for low bit rate speech coding detection Method and apparatus for low bit rate speech coding detection

2008-05-16

2011-10-04

Smits, Talivaldis Ivars (Department: 2626)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

C704S206000, C704S213000

Reexamination Certificate

active

08032366

ABSTRACT:
To increase channel capacity, mobile phone carriers have deployed speech coders, such as Advanced MultiBand Excitation coding (AMBE), in networks to reduce the bit rate of each call. One undesired consequence of employing such speech coders is that the voice quality can be much worse as compared to higher bit-rate speech coders. A method or corresponding apparatus in an example embodiment of the present invention performs voice quality enhancement transparently within a network by detecting use of a coder applying rate reduction to a speech signal and known to have an adverse effect on a coded speech signal. Upon detection of the use of such coder, the coded speech signal is corrected based on components introduced into the coded speech signal due to the rate reduction. As a result of applying the voice quality enhancement, adverse effects of speech coders can be reduced, while maintaining high quality voice signals.

REFERENCES:
Juin-Hwey Chen and Allen Gersho, “Adaptaive Postfiltering for Quality Enhancement of Coded Speech”, IEEE Trans. Speech and Audio Processing, vol. 3, p. 59-70, Jan. 1995.
R.C. de Lamare and A. Alcaim, “Strategies to improve the performance of very low bit rate speech coders and application to a variable rate 1.2 kb/s codec”, IEE Proceedings—Vision, Image and Signal Processing, vol. 152, 74-86, Feb. 28, 2005.

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