In file Fl.d:

void FlTrapezoid

(float low_zero, float low_one, float high_one,
  float high_zero, float si, I32 nsamp,
  float filter[])

Builds a Trapezoidal time domain filter using the given parameters.

Documentation

Builds a Trapezoidal time domain filter using the given parameters.
Parameters:
low_zero - the 0 intercept in frequency space.
low_one - the frequency are which the filter reaches 1.
high_one - the frequency at which the filter starts decreasing.
high_zero - the 0 intercept of the right hand side of the filter in frequency space.
si - the sample rate in seconds.
nsamp - the number of samples.
filter - [] the filter produced, which is in time space.
Returns:
none.

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