The design of arbitrary-length cosine-modulated filter banks
Zijing Zhang · Microcomputer Information · 2008
It is well known that FIR filter banks which satisfy the perfect reconstruction (PR) property, can be obtained by cosine modulation of a linear-phase prototype filter of length , where is the number of channels. In this paper, we present a PR cosine-modulated filter banks where the length of the prototype filter is arbitrary. An efficient iterative Lagrange multiplier approach is devel-oped to design the filter banks. This approach has high design efficiency, simple design procedure and is not sensitive to the initial prototype filter coefficients. It has a satisfying passband.