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Tricks of the Mac Game Programming Gurus
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SoundEffects 0.9.2
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Effects Folder
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Low Pass IIR
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TEXT_1000_About.txt
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1994-11-21
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The IIR Low Pass effect module filters the selected waveform using the following equation:
y(n) = ax(n) + by(n-1),
where y is the output and x is the input, and a and b are the two coefficients you can set in the settings dialog.
When b is greater than a, the cutoff frequency is lowered, therefore obtaining a lowpass filter.