A digital filter for IQ-Generation, noise shaping and neighbour channel suppression

摘要

A polyphase filter of order x . N that is building N allpass filters of order x . N according to the present invention has a structure of an allpass filter of order x comprising delay elements with a delay 1 and at least one multiplier, wherein all delay elements with a delay of 1 are replaced by delay elements with a delay of N and the sampling rate of fs' = fs/N with fs being the sampling rate of the input signal. <??>Preferably the multiplier included in the structure of the allpass filter of order x comprises N-time multiplex multiplication coefficients that are used in a predetermined order. <IMAGE>