Reson~ changing Q with constant output volume - MaxMSP Forum | Cycling '74

Reson~ changing Q with constant output volume

Oct 23 2013 | 11:40 am

Hi all,

I'm looking for a formula to compensate the volume loss, when raising the Q factor of reson~ bandpass filter.

The input signal is noise-like (brushed snare).

Any ideas? A heuristic formula would be sufficient.

Thanks a lot! Jan

Oct 23 2013 | 1:37 pm
Peter McCulloch
Q = center frequency / bandwidth (in Hz)
Compare the previous bandwidth to the current bandwidth and that's probably a starting point for a ratio. (Previous:current)
Alternatively, you could use an envelope follower, convert its output to db via atodb~, and apply makeup gain.
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Oct 23 2013 | 3:20 pm
mudang
Thanks Peter!
The solution was to simply multiply the output signal with the Q factor! The overall volume is not perfectly constant but good enough for my purposes.
Cheers, Jan
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