Howtosignalprocessing
What is fractional delay filter?
A fractional delay filter is a filter of digital type having as main function to delay the processed input signal a fractional of the sampling period time.
What is a Farrow filter?
A Farrow filter structure provides variable fractional delay for the received data stream prior to downstream symbol sampling. This special FIR filter structure permits simple handling of filter coefficients by an efficient polynomial interpolation formula implementation to provide variable fractional resampling.
What is a delay filter?
Filtering a signal introduces a delay. This means that the output signal is shifted in time with respect to the input. When the shift is constant, you can correct for the delay by shifting the signal in time. Sometimes the filter delays some frequency components more than others.
