Kurzweil:Two-pole Allpass

From Sonikmatter

The Two-pole Allpass filter is very similar to the One-pole Lowpass filter except that it is a 2 block filter and hence has a width control. Additionally this filter has a phase offset for low frequency's of 0 degrees through -180 degrees at the centre frequency with a maximum phase offset at high frequency's of -360 degrees.

The width control adjusts the steepness of the phase response near the centre frequency. At high values of width the slope of phase adjustment is shallow with a gradual change in phase offset over the entire frequency spectrum. At low widths the majority of the frequency spectrum is either at the maximum or minimum phase offset with a rapid change in phase over a very narrow frequency range.

Lower widths are more suited to creating phasers and dramatic effects, whereas higher widths are more suitable for using as reverbs and more subtle effects.

The Puppeteer 22:32, 14 Aug 2005 (EDT)

• Here is a link to a tutorial which uses this DSP Block.

chuck

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