Usage of voice activity detection for efficient coding of speech

Details Usage of voice activity detection for efficient coding of speech Usage of voice activity detection for efficient coding of speech

1996-01-22

1997-11-18

Tung, Kee M.

395 223, 395 224, 395 242, G10L 302

Patent

active

056896158

ABSTRACT:
A method for efficient coding of non-active voice periods is disclosed for a speech communication system with (a) a speech encoder, (b) a communication channel and (c) a speech decoder. The method intermittently sends some information about the background noise when necessary in order to give a better quality of overall speech when non-active voice frames are detected. The coding efficiency of the non-active voice frames can achieved by coding the energy of the frame and its spectrum with as few as 15 bits. These bits are not automatically transmitted whenever there is a non-active voice detection. Rather, the bits are transmitted only when an appreciable change has been detected with respect to the last time a non-active voice frame was sent. To appreciate the benefits of the present invention, a good overall quality can be achieved at rate as low as 4 kb/s on the average during normal speech conversation.

REFERENCES:
patent: 5278944 (1994-01-01), Sasaki et al.
patent: 5475712 (1995-12-01), Sasaki
patent: 5509102 (1996-04-01), Sasaki

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