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Usage of voice activity detection for efficient coding of speech
Usage of voice activity detection for efficient coding of speech
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机译:语音活动检测用于语音的有效编码
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摘要
A method for efficient coding of non-active voice periods is disclosed for a speech communication system with (a) a speech encoder 110, (b) a communication channel 150 and (c) a speech decoder 155. 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.
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