Patent ID: 6925116
Filing Date: 2005-08-02
Classification: G10L,H04B

Abstract:
1. A method for providing a transposed signal which is transposed by a factor M, comprising the following steps: filtering an input signal through a parallel bank of L filters with impulse responses as where k=0, 1, . . . , L−1, K is a constant, and p downsampling said set of L signals with a factor L/M, producing a set of L complex-valued subband signals; multiplying phase-angles of said set of L complex-valued subband signals by M, giving a new set of subband signals; selecting real parts of said new set of subband signals, resulting in a set of L real-valued subband signals; upsampling a subset of said set of L real-valued subband signals with a factor L′, producing a set of real-valued signals; filtering said set of real-valued signals through a parallel bank of L′ filters with impulse responses as where k′=0, 1, . . . , L′−1, K′ is a constant and p adding said set of L′ filtered signals and the input signal to produce a transposed signal.