A scalable digital audio encoder based on embedded zerotree wavelet
Jianxin Yan, Zaiwang Dong, Weibei Dou · 2004
In this paper, a scalable audio scheme is presented, which is mainly based on an embedded zerotree wavelet (EZW) coding technology. Firstly, 29 critical subbands are obtained by splitting audio signals with a digital wavelet package transform (DPWT). Then a zerotree coding is acted on these subbands. Lastly, an entropy coding is applied to remove redundancy and a specific frame structure is formed. The resulting encoder can support a scalable bit stream from 16 kbps to 64 kbps with a 4 kbps step size for a single audio channel and the graceful degeneration of subjective audio quality can also be provided.