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Function [up] [down]
Works on frequencies except a specific frequency-band, means supresses or boosts them and let the band pass through unaltered.

Parameter [up] [down]
Effect (P1)how much the operator effects the outcome. Negative values produce theopposite effect - they boost frequencys.
Low Cut-Off (P2)lower bound of the band, relative frequencies ranging from 0 Hz to half of sampling-rate
High Cut-Off (P3)upper bound of the band
Nr. (Length)How many coefficients should be used. The more they are, the better results will be get.(max 1024, but 64 is usually enough)
Window (W1)what windowfunction to use

Notes [up] [down]
Please don't wonder because of these long calculation-times. If you are using e.g. 64 coefficients, SFX needs to do 128 multiplications and 128 additions for each samplevalue. Since SFX lets you modulate filterspecifications (and not using fixed ones like other programs do), it has to redesign the filter each samplevalue. Therefore again a bunch of calculation steps are neccessary.
For FIR-filters a mathematical coprocessor really helps !

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© by Stefan Kost 1993-2001