note, this is not a distribution of frequencies, but of noise values.. marius.
Martin Peach wrote:
Oh no that's wrong isn't it :(The log is necessary to keep the distribution normal, and the range is going to get wider the closer to zero the radius is allowed to get.The attached patch has a scale adjustment...Still I wonder what kind of distribution gaussianoise2 gives, it's not just white.Martin Martin Peach wrote:Charles Henry wrote:On Sun, Mar 16, 2008 at 11:16 AM, Martin Peach <[EMAIL PROTECTED]> wrote:(gaussianoise has occasional values that exceed [-1 ... 1], which I suppose is normal...white noise is always on [-1...1])That's true. With the Box-Muller method, there is the log(~U1) term, but you can always just add a small value to U1, which will truncate your distribution. The size of the small value can be calculated to fit with any given threshold.I think it's really because the Box-Muller method selects random numbers in pairs which map to points in a unit square on the plane, but then selects only those points which are inside the unit circle, something that the pd patch doesn't do (how to resample points in a dsp vector until they are in range?). The attached patch shows the straightforward way of doing it by simply selecting a random radius and angle and returning the resulting y coordinate as the random number. The results are always on [-1,1].I don't think sin~ will be any slower than log~. Martin ------------------------------------------------------------------------ _______________________________________________ PD-list@iem.at mailing listUNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list------------------------------------------------------------------------ _______________________________________________ PD-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
noise-distr.pd
Description: application/extension-pd
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