Patent ID: 8823559

Claim:
A method of converting the sampling rate of an input signal with input/output shift-invariance using a Linear Periodically Time Varying (LPTV) system, the method comprising: generating a set of polyphase components of the input signal wherein the LPTV system is a digital Sampling Rate Conversion (SRC) system having a fractional ratio R P , with R and P being co-primes: selecting three integer numbers Q, M and q that satisfy the following equations: M=RQ; q=PQ; and MP=qR; feeding the generated set of polyphase components to the SRC system; and generating an output signal corresponding to the input signal with a converted sampling rate, by performing interleaving, shifting, and addition on signals output by the SRC system corresponding to the generated set of polyphase components processed by the SRC system; wherein the generation of each polyphase component of the set of polyphase components comprises: time shifting the input signal a number of times between 0 and MP; and M-fold decimating the time shifted input signals.