ah, I remember now, The comb filters are indeed IIR (with feedback), and there's a lowpass filter in the combfilter feedback loop. The number are the coefficients for the comb-lowpass-filter, the first (.21) can be translated to feedback amount, the second (.2) to lowpass filtering amount, the third (e.g. 1557) should be the delay time in samples, ...afaik. 2008/12/2 basshead6949 : > > Hello, > > Oeyvind, regarding this link's diagram of the parallel and series filters: > > http://www.dsprelated.com/dspbooks/pasp/Freeverb.html. > > What do the numbers inside the boxes represent? > > For example the first Comb has this information from which it runs: .21, .2, > 1557 > > Best, > > Doug > > > > 2008/12/1 Iain McCurdy : >> A digital reverb, in the mould of Schroeder or Moorer (google these >> names), >> can be designed using comb and all pass filters; Csound has plenty of >> these >> but if you want you can model comb and all pass filters using delay >> opcodes. >> The secret to creating a smooth reverb effect will be to choose >> appropriate >> values for delay (loop) time for the delays/filters - if you choose the >> wrong values you will either get discernible echoes or ringing sounds (or >> both). Have a look at the documention and example for the nreverb opcode >> as >> this will give you some clues as where to start. >> Bye, Iain >> >>> Date: Mon, 1 Dec 2008 03:09:07 -0800 >>> From: basshead6949@hotmail.com >>> To: csound@lists.bath.ac.uk >>> Subject: [Csnd] Building my own reverb unit >>> >>> >>> Hi guys, >>> >>> It's been a while since I've been in the Csound loop but nevertheless I >>> now >>> have to use it to build my own reverb unit. I know that I have to >>> feedback >>> the same signal with a certain delay time and with slightly more >>> attenuation >>> each time for x amount of times. I was just on the look out for any good >>> advice from someone who has done this before. >>> >>> I am planning to use a vdelay to feed the signal back through and >>> attenuate >>> it. Now, considering what I ultimately want is a slider controlling >>> something comparable to room size and one for reflectivity, density and >>> maybe high/low cut (fairly simple) what would you suggest as being the >>> sensible opcodes and methods? >>> >>> I'm comparatively inexperienced so please, any suggestions will do. >>> >>> Thanks very much, >>> >>> Doug >>> -- >>> View this message in context: >>> http://www.nabble.com/Building-my-own-reverb-unit-tp20769912p20769912.html >>> Sent from the Csound - General mailing list archive at Nabble.com. >>> >>> >>> >>> Send bugs reports to this list. >>> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe >>> csound" >> >> ________________________________ >> Windows Live Hotmail now works up to 70% faster. Sign up today. > > > Send bugs reports to this list. > To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe > csound" > > > > -- > View this message in context: http://www.nabble.com/Building-my-own-reverb-unit-tp20769912p20798185.html > Sent from the Csound - General mailing list archive at Nabble.com. > > > > Send bugs reports to this list. > To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe csound" >