Abstract:Two-band continuous time wavelets can be obtained from infinite-level binary tree-structured QMF banks.Similarly,two-band discrete time wavelet transform can be represented as a finite-level binary tree-structured QMF banks.In this paper,two-band discrete time wavelet transforms are generalized to M-band discrete time wavelet transforms.The relationship between M-band discrete time wavelet transforms and M-band paraunitary filter banks is also investigated.It is shown that if the filter banks on each level are parannitary,the wavelet basis generated by this tree is orthonormal.