FIgdelFIR

Routine

double FIgdelFIR (double w, const float h[], int Ncof)

Purpose

Calculate the group delay for an FIR filter

Description

The group delay is calculated for the equivalent non-causal filter with reference point at the mid-point of the filter. The delay to the mid-point is added to this figure. The group delay in seconds at frequency f for a response with sampling frequency Fs can be calculated as 

  gdel = FIgdelFIR (2 * Pi * f / Fs, h, Ncof) / Fs .

Parameters

-> double w
Normalized radian frequency (0 to Pi).
-> const float h[]
Array of Ncof filter coefficients
-> int Ncof
Number of filter coefficients

Author / revision

P. Kabal / Revision 1.4 2003/05/09

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