In a project I am working on I am using a [bp~] to mimic a helmholtz resonator. The difficult part is that this cilinder I am modeling is constantly changing its volume, thereby changing its resonant frequency and Q.
This works well at lower speeds but the trouble is that the cycles go up to once every 30 milliseconds. This means that the frequency and Q go up and down again 33 times per second. Long before these frequencies this setup tends to explode and create feedback.
My thoughts about my problem tend to point at the Nyquist frequency of control signal sample time. Is this true and can I change the sampling speed of control signals? Of course I thought about sending the data in audio signal but [bp~] does not accept that of course.
Is there another filter out there that I can control with audio signals if I cannot change the control signal sample speed?
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