Monday, February 27, 2006

all-pass filter

All-pass filter

The allpass filter is an important building block for digital audio signal processing systems. It is called ``allpass'' because all frequencies are ``passed'' in the same sense as in ``lowpass'',
``highpass'', and ``bandpass'' filters. In other words, the amplitude response of an allpass filter is 1 at each frequency, while the phase response (which determines the delay versus frequency) can be arbitrary. So the phases are changed with various frequencies

In practice, a filter is often said to be allpass if the amplitude response is any nonzero constant.

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