To get a realistic (or a musical for matter) sounding reverb it will include thousands of listening tests with various test signals - I haven't seen any 'automated' or any particular strategy for tuning reverbs in the wild other than extensive listening tests. The AP delay lines gets longer for each segment when connected in series, but I don't believe I have seen an overall strategy for the ratio and it's not particular important to use primes either. It's obvious that the output taps needs a ping pong behavior.
-----Original Message----- From: music-dsp-boun...@music.columbia.edu [mailto:music-dsp-boun...@music.columbia.edu] On Behalf Of gm Sent: 28. september 2017 16:47 To: music-dsp@music.columbia.edu Subject: Re: [music-dsp] Reverb, magic numbers and random generators #2 the Go approach And here's how I've been doing it before the RNG approach, I present you: The Go strategy of impulse spacing If the delay loop period is 1, in a first step this places the impulses so that consecutive impulses fall exactly in between already delayed impulses within the first periods, by setting the ratio "a" according to Na mod = a/2 and Na mod 1 = 1 - a/2 for N = 2,3,4... which gives the series a = 2/(2n-1) and 2 = 4/(2n+1) : 2/3, 2/5, 2/7, 2/9... and 4/5, 4/7, 4/9, 4/11... Note that reciprocals work in a similar way. The first delay in this strategy can also be set to a = 1/2 which gives ratios of 0.5, 0.66667 and 0.8, or pitch differences of -12, -7.02 and -3.86 semitones. We see the octave is neatly divided by this strategy. With rational ratios like this, the pattern would repeat quickly and impulses would fall exactly on delayed impulses after a few iterations. Therefore we now carefully detune the ratios so that consecutive repetition cycles do not coincide. There are also strategies for detuning and to avoid beating and flanging as well as certain magic numbers which fulfill this and additional criteria. Once a satisfying couple or triplet has been found the ratios can be reused on additional early diffusion stages, scaled by a matching strategy like Schröders 1/3^n scaling. Comments? _______________________________________________ dupswapdrop: music-dsp mailing list music-dsp@music.columbia.edu https://lists.columbia.edu/mailman/listinfo/music-dsp _______________________________________________ dupswapdrop: music-dsp mailing list music-dsp@music.columbia.edu https://lists.columbia.edu/mailman/listinfo/music-dsp
