01454607

j

01454607 Gao, X.-Q. He, Z.-Y. Xia, X.-G. The theory and implementation of arbitrary-length linear-phase cosine-modulated filter bank. Signal Process. 80, No. 5, 889-896 (2000). 2000 Elsevier Science, Amsterdam EN Cosine-modulated filter bank Linear phase Perfect reconstruction Two-channel lossless lattice Discrete cosine-sine transform

doi:10.1016/S0165-1684(99)00174-7

Summary: We propose an arbitrary-length linear-phase cosine-modulated filter bank (CMFB). It can be considered as an extension of the existing linear-phase CMFBs to arbitrary length. It is shown that the 2M-channel arbitrary-length linear-phase CMFB needs to satisfy the same conditions as the conventional M-channel arbitrary-length CMFB does for perfect reconstruction. By using the linear-phase property of a prototype filter, we obtain an efficient implementation structure in which $2\times 2$ lossless lattices are used instead of $2\times 1$ ones in the traditional implementation of the existing linear-phase CMFBs. The total number of the lattices is reduced by a half.