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Forums - Synths & synthesis
Subject: self-oscillating filters
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Original Message 1/3 29-Aug-99 @ 08:54 PM - self-oscillating filters
I posted this to the Analog Korner discussion group (for those that read the forums on www.dancetech.com) but perhaps someone from this forum could help me out (you listening, Phil?):
I've been waiting a month for my new Nova and I've had nothing to do while waiting except research analog synthesis. I know what self-oscillating filters sound like, but I'd really like to know the physical properties of them. i.e. what makes them oscillate? I know on the Nova, it comes from boosting the resonance full blast (and I assume this is the same on true analog filters), but how does a massive presence boost at the cutoff frequency set it into oscillation?
I have a strong background in electronics and audio theory, so if anyone knows the nuts and bolts, lay it on me. Be as technical as you can. Thanks in advance...
psylichon
I've been waiting a month for my new Nova and I've had nothing to do while waiting except research analog synthesis. I know what self-oscillating filters sound like, but I'd really like to know the physical properties of them. i.e. what makes them oscillate? I know on the Nova, it comes from boosting the resonance full blast (and I assume this is the same on true analog filters), but how does a massive presence boost at the cutoff frequency set it into oscillation?
I have a strong background in electronics and audio theory, so if anyone knows the nuts and bolts, lay it on me. Be as technical as you can. Thanks in advance...
psylichon
Message 2/3 31-Aug-99 @ 04:22 PM - RE: self-oscillating filters
In analogue curcuits there is a
residual noise level. If the filter
is set to resonate, postive feedback,
then something has to give it a
trigger...Noise in analouge...in a
digital system you have to give it a
kick cos there is no noise...but the
result is the same.
Phill@N
residual noise level. If the filter
is set to resonate, postive feedback,
then something has to give it a
trigger...Noise in analouge...in a
digital system you have to give it a
kick cos there is no noise...but the
result is the same.
Phill@N
Message 3/3 31-Aug-99 @ 07:06 PM - RE: self-oscillating filters
Thanks for the quick reply, Phill.
It's interesting... I didn't know that there was feedback involved with resonance in a filter. I always thought it was just an amplitude boost near the filter cutoff frequency, with the Q being the width of the boost. But I suppose the word "resonate" assumes there is some kind of oscillation in the circuit. Just shows how much I have to learn...
Does anyone know any websites that may help fill in the gaps for me? All I can seem to find are general overviews. Thanks for the help. Peace...
psylichon
It's interesting... I didn't know that there was feedback involved with resonance in a filter. I always thought it was just an amplitude boost near the filter cutoff frequency, with the Q being the width of the boost. But I suppose the word "resonate" assumes there is some kind of oscillation in the circuit. Just shows how much I have to learn...
Does anyone know any websites that may help fill in the gaps for me? All I can seem to find are general overviews. Thanks for the help. Peace...
psylichon
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