User`s guide

Variable Fractional Delay
5-494
For delay values less than P/2-1, the output is computed using linear
interpolation. Delay values greater than D are clipped to D, where D is the
Maximum delay.
The block uses the
intfilt function in the Signal Processing Toolbox to
compute the FIR filters.
Note When the Variable Fractional Delay block is used in a feedback loop, at
least one block with nonzero delay (e.g., an Integer Delay block with
Delay > 0) should be included in the loop as well. This prevents the occurrence
of an algebraic loop if the delay of the Variable Fractional Delay block is
driven to zero.
Examples The dspafxf demo illustrates an audio flanger system built around the
Variable Fractional Delay block.
Dialog Box
Mode
The method by which to interpolate between adjacent stored samples to
obtain a value for the sample indexed by the input at the
Delay port.