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From: Roger Dannenberg <rbd@cs...>  20090623 03:10:44

I think your calculations are right and it looks like tapv is working as predicted. Here's what I tried: (defun test () (vector (hzosc 1000.0) (shifter (hzosc 1000.0)))) (defun shifter (s) (sndtapv s (* 0.001 (/ 60.0 360.0)) (mult (* 0.001 (/ 30.0 360.0)) (lfo 1.0)) 0.001)) (play (test)) Viewing this in Audacity, I can see a small phase shift with maximum shift 1/4 of the way through and minimum at 3/4 as you would expect since the lfo rises to a peak of 1 after 1/4 cycle and to 1 at 3/4 cycle. Roger Dave Storer wrote: > I'm trying to build a simple plugin which will apply an oscillating phase shift to one channel of a stereo signal. Both channels of the stereo signal consist of a constant frequency sine wave, the same frequency on each channel. > > What I would like is a plugin which would accept as input the frequency of the input signal, the minimum and maximum phase shift, in degrees, and the modulation frequency of the oscillation. The plugin would apply a varying time delay to the signal on one channel, so that its phase changes withing the given limits. > > For example, the starting signal is a 1Khz sine wave. Minimum phase shift is to be 30 degrees, and the maximum 90 degrees, with a modulation frequency of 1 Hz. > > To watch the phase shifts, I have a copy of the Goldwave editor running, with its display set to plot the left and right channels on the x and y axes of a graph, essentially displaying a Lissajous figure. > > I've tried several approaches using sndtapv, but without throwing in a mysterious scale factor, I can't get it to work. > > With a 1KHz signal, one period is 0.001 second, so the minimum delay should be 0.083333 x 0.001 (30 degrees is 1/12 of a circle  1/12 = 0.083333). This much works. The problem is in specifying the scale factor for the low frequency oscillator. If the fixed delay is set to 60/360 x 0.001, it seems like the scale factor for the lfo should be 30/360 x 0.001, but this gives a barely noticeable oscilation. In order to get the desired phase shift, I have to throw in a fudgefactor, scaling up the lfo as described above by approximately 110. Different values for the minimum and maximum require different scale factors, and the variations seem to be nonlinear. For example, the same requirements as above, but on a 100Hz signal, requires a fudgefactor of about 35. > > Obviously, I'm missing some key understanding of how sndtapv works. Can anyone suggest a different approach. > > Thanks for any insight you can give me. > Dave Storer > > >  > Are you an open source citizen? Join us for the Open Source Bridge conference! > Portland, OR, June 1719. Two days of sessions, one day of unconference: $250. > Need another reason to go? 24hour hacker lounge. Register today! > http://ad.doubleclick.net/clk;215844324;13503038;v?http://opensourcebridge.org > _______________________________________________ > Audacitynyquist mailing list > Audacitynyquist@... > https://lists.sourceforge.net/lists/listinfo/audacitynyquist > > 
From: Roger Dannenberg <rbd@cs...>  20090623 02:34:09

If anything, the frequency is doubling and period is halving, consistent with a big increase in amplitude of the the second harmonic. Early papers by John Chowning have an analysis. Roger paul beach wrote: > I did a graphic to compare increments of modulation. Period doubling > seems to be obvious, though not in the chaotic sense. Will look at > Bessel functions, to see if any sense can be made of this. > > http://www.climatehoax.ca/music/fm_doubling.gif > 
From: Dave Storer <davewstorer@ya...>  20090623 02:24:18

I'm trying to build a simple plugin which will apply an oscillating phase shift to one channel of a stereo signal. Both channels of the stereo signal consist of a constant frequency sine wave, the same frequency on each channel. What I would like is a plugin which would accept as input the frequency of the input signal, the minimum and maximum phase shift, in degrees, and the modulation frequency of the oscillation. The plugin would apply a varying time delay to the signal on one channel, so that its phase changes withing the given limits. For example, the starting signal is a 1Khz sine wave. Minimum phase shift is to be 30 degrees, and the maximum 90 degrees, with a modulation frequency of 1 Hz. To watch the phase shifts, I have a copy of the Goldwave editor running, with its display set to plot the left and right channels on the x and y axes of a graph, essentially displaying a Lissajous figure. I've tried several approaches using sndtapv, but without throwing in a mysterious scale factor, I can't get it to work. With a 1KHz signal, one period is 0.001 second, so the minimum delay should be 0.083333 x 0.001 (30 degrees is 1/12 of a circle  1/12 = 0.083333). This much works. The problem is in specifying the scale factor for the low frequency oscillator. If the fixed delay is set to 60/360 x 0.001, it seems like the scale factor for the lfo should be 30/360 x 0.001, but this gives a barely noticeable oscilation. In order to get the desired phase shift, I have to throw in a fudgefactor, scaling up the lfo as described above by approximately 110. Different values for the minimum and maximum require different scale factors, and the variations seem to be nonlinear. For example, the same requirements as above, but on a 100Hz signal, requires a fudgefactor of about 35. Obviously, I'm missing some key understanding of how sndtapv works. Can anyone suggest a different approach. Thanks for any insight you can give me. Dave Storer 
From: paul beach <sniffyraven@fa...>  20090623 01:06:11

I did a graphic to compare increments of modulation. Period doubling seems to be obvious, though not in the chaotic sense. Will look at Bessel functions, to see if any sense can be made of this. http://www.climatehoax.ca/music/fm_doubling.gif  paul beach sniffyraven@... 