Jonatan Liljedahl wrote: > I'm having problems with distorted sound with ALSA. It's not clipping > distortion but more like a dirty spectra. > The test I am doing is playing a pure 440Hz sawtooth wave, and the sound > is very unclean, there's inharmonic partitials that shouldn't be there, > actually below the fundamental frequency I think. Compared to an analog > sawtooth oscillator it sounds really awful.
Here's a picture of the resulting waveform when playing a pure sawtooth and recording it straight in again on my Terratec Phase 26. As you can see, there is some kind of ringing happening... But, this is interesting, when recording a pure sawtooth from my analogue modular into my soundcard (through a mixing desk) there was some ringing too, but it didn't sound at all as dirty as the previous computer-generated sawtooth. When playing back this recorded analogue sawtooth, I had a hard time hearing the difference. So, I guess it's not the ringing this is about. And now when I listen again with different frequencies I definitely hear that the polution of the spectra is subtones, frequencies below the fundamental. Perhaps the problem is some cyclic jitter? But it seems dependent on the high overtones of the computer-generated waveforms since I can't hear it when recording a sawtooth from the outside... Any ideas what this is and what I can do about it? -- /Jonatan [ http://kymatica.com ]
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