Adaptive extended lapped transforms
Ricardo Lopes de Queiroz, K.R. Rao · IEEE International Conference on Acoustics Speech and Signal Processing · 1993
The perfect reconstruction conditions for a time-varying lapped transform are presented. Emphasis is placed on a class of cosine modulated filter banks known as the extended lapped transforms. A mechanism for achieving this error-free variation through the factorization of the transform matrix into sparse factors is presented along with a discussion of transition states. Some possible applications are indicated, including a structure for perfect reconstruction orthogonal time-varying wavelet packets.>