Adaptive extended lapped transforms

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.<<ETX>>

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