MATLAB SIGNAL PROCESSING BLOCKSET 7 Guide de l'utilisateur télécharger pdf (Page 651)

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101

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.

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