Variant of one-pole filter? what is it ?
hello, does anybody knows about this variant of one-pole?
the gen~ patch on the left is a one-pole filter. the spectroscope shows the input in green and the output in red.
in the gen patch on the right, the output of the onepole is fed back to the input with a certain delay (the signal is substracted and not added to the input) the output is multiplied by 2 so there's no error between the input and output.
now, the output follows the input signal with a elastic behavior. does anybody knows the name of this system ?
this is interesting, it looks a bit like the resonance of a two-pole filter.
when feedbacking filters you usually subtract.
don't know more...
From the point of view of the onepole, the delay adds resonance via a delayed negative feedback -- the resonance creates the elastic behaviour.
From the point of view of the delay loop this is a comb filter (FB = -1, FF = 0), with a onepole lowpass inserted in the loop. The fact that the comb feedback coefficient is -1.0 would normally make this saturate as it accumulates more input, but the onepole as a damper counteracts that buildup (but only when the lowpass frequency is low enough).
What's the context, where was it found?