Forums > MaxMSP

low pass filtering the feedback of a comb filter??

May 13, 2008 | 3:41 pm

I am attempting to build a reverb and have just come across Moorer’s article which explains a method for building a reverb simulation of Boston Symphony Hall. The method is a tapin~ with 19 tapout~ at specific times. This is patched to 6 parallel comb filters with low pass filters in the feedback chain, then into an allpass. I first built the comb filters from 6 individual tapin~/out~ with a onepole~ in the feedback chain and controllable feedback. This method works alright but its a little grainy and it rings a little. I then tried it with the comb~ object and got a much better result with longer decay time. The only problem is that as comb~’s working are all done inside the object I can’t place the low pass into the feedback chain. Has anyone any suggestions about how to either make the tapin~/out~ method sound a little nicer or how to get a low pass into the feedback chain of the comb~ object?

Cheers,
John


May 14, 2008 | 10:24 am

Check out this thread where we were discussing different comb filtering options:

http://www.cycling74.com/forums/index.php?t=msg&goto=137685&rid=4220&S=d203ac5252222de3228c5ec3bf94cae9

If that isn’t helpful, I’ll post again when I am not supposed to be sleeping.



kjg

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