A speech coding algorithm based on wavelet transform

Publisher Summary Wavelet transform has begun to be used in audio compression and speech parameter abstraction; it has not been used in speech compression. In this chapter, a speech coding algorithm is given based on wavelet transform. It has the features of high compression gain, good quality, wide applicability, and no artifacts. It is effective not only to speech signals but also to music signals, so it helps to implement low bit rate audio compression. The shortcoming of the algorithm is that because of the high compression gain, too much of the high frequency part of the signal is lost. Therefore, the reconstructed speeches sound low and deep. Because this algorithm belongs to waveform coding methods of transform domain, the use of perceptual effect is necessary, which will greatly improve the quality of the reconstructed signals.