was looking for a substitute/parallel object to BrownNoise in Sc, which is described just as "Generates noise whose spectrum falls off in power by 6 dB per octave."
Another one would be GreyNoise, described as "Generates noise which results from flipping random bits in a word. This type of noise has a high RMS level relative to its peak to peak level. The spectrum is emphasized towards lower frequencies." thanks 2015-11-14 17:17 GMT-02:00 Matt Barber <brbrof...@gmail.com>: > "True" pink noise is likewise impossible: if it's equal energy per octave, > then since there is no "lowest octave," any energy in any octave implies > infinity at 0hz. The fexpr~ approach I gave accumulates, but imagines a > "container" with "walls" at +/- 1.0 where whatever was doing the random > walk "bounces" off the wall. It should have a color within auditory range > similar to unrestricted integration. A lot depends on what you want to do > with the noise (it's not necessarily an audio source). > > Convolution is a pretty good way to go. I've seen a number of filters that > try to distribute phase randomly across the frequency magnitude curve. Also > remember that the 6dB dropoff is with respect to log frequency, whereas FFT > is linear in frequency. > > On Sat, Nov 14, 2015 at 1:35 PM, Martin Peach <chakekat...@gmail.com> > wrote: > >> There's [rojo~] in mrpeach, if by brown noise you mean red noise. >> (brownian noise?) >> [rojo~] tends to grow out of bounds, which is a problem with correlated >> noise: if you want long term correlations you have to be ready for the >> noise to get very loud. So in practice there is no red noise possible, it's >> all high pass filtered. >> To get any arbitrary shape of noise it can be done most efficiently by >> convolving a frequency curve table with white noise. The table would have >> the same length as the number of bins in the FFT. >> >> Martin >> >> On Fri, Nov 13, 2015 at 10:35 PM, Alexandre Torres Porres < >> por...@gmail.com> wrote: >> >>> hi, wondering how to implement brown noise in Pd (vanilla or extended) - >>> moreover, I'd like and if there's an external that does it. >>> >>> same about grey noise >>> >>> thanks >>> >>> alex >>> >>> _______________________________________________ >>> Pd-list@lists.iem.at mailing list >>> UNSUBSCRIBE and account-management -> >>> http://lists.puredata.info/listinfo/pd-list >>> >>> >> >> _______________________________________________ >> Pd-list@lists.iem.at mailing list >> UNSUBSCRIBE and account-management -> >> http://lists.puredata.info/listinfo/pd-list >> >> >
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