Re: [Audacity-nyquist] Clipping with inversed polarity - idea for a fix
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From: paul b. <sni...@fa...> - 2008-12-24 18:12:48
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Season's Greeting, I am changing topic, or going back to something related to the original thread. Can the low pas roll off be 6 or 12 decibels per octave? (simrep ( i n) can make a sin wave series. If the cut off of the low pass filter is set to the first harmonic, it will be similar to a Fourier series. Question two, see plug-in, the first operation can only be + for the next step (hzosc (+ (* i p) p) ) Perhaps I don't understan simrep. I want to use this for something practical, (for me). Consider the propeller noise of an airplane. There will be a beat for two engines, and also for the turbulence at the wings tips. This wasted energy would look like a helix at the edge of the air foil. The attached plug has a sine series of 11 overtones. The default setting mixes this with a sine of 5 hertz which is quite audible; that is you certainly do hear lower than 20 herz if it is part of the waveform. If A.M. is set to 30 herz it sounds like a motor boat. At 1 or less it sounds like an airplane. With some frequency modulation it could sound like a dogfight. A higher Fundamental setting at 600 hertz sounds like a mosquito, but as mentioned, there should be a low pass roll off of 6 or 12 decibels. On Wed, 24 Dec 2008 11:09:40 -0500, "Roger Dannenberg" <rb...@cs...> said: > Since the clipfix code begins by making copy of the input sound, I can > understand why the code uses a lot of memory. The algorithm used by the > code is undocumented and the indentation does not match the program > structure, so I didn't get very far trying to quickly grasp what's > really going on there. I'd be happy to comment on approaches if anyone > plans to do some rewriting. -Roger > > > ------------------------------------------------------------------------------ > _______________________________________________ > Audacity-nyquist mailing list > Aud...@li... > https://lists.sourceforge.net/lists/listinfo/audacity-nyquist -- paul beach sni...@fa... |