All-Pass Filters.

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Presentation transcript:

All-Pass Filters

All-Pass Filters

All-Pass Filters output: (scaling factor = .5) impulse input: faster exponentially-decaying sequences than comb filter

[iv:44] with all-pass filter All-Pass Filters Applying an all-pass filter to the oboe spectrum at the fundamental frequency produces amplitude peaks similar to that of a comb filter. [iv:15] oboe at 261.6 Hz [iv:44] with all-pass filter at 261.6 Hz

All-Pass Filters When the all-pass filter is set to the 4th harmonic, it still gives amplitude peaks, but when it is set to the 5th harmonic, the spectrum resembles that of the original oboe. [iv:45] a-p filter at 1046.4 Hz [iv:46] a-p filter at 1308 Hz

All-Pass Filter ; alpass arguments: signal, ring time, loop time ; where loop time = 1/allpassFreq … asig1 alpass asig, iring, 1/iapfreq aenv linseg 0,iattack,iamp,isus,iamp,idecay,0,1,0 asig = asig1 * aenv out asig ; output signal endin