Digital filter for IQ-generation, noise shaping and neighbor channel suppression
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United States of America Patent
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Jan 9, 2007
Grant Date -
Jan 31, 2002
app pub date -
May 23, 2001
filing date -
May 24, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A polyphase filter of order xN that builds N allpass filters of order xN has a structure of an allpass filter of order x comprising delay elements with a delay of 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.
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