Nate: Doesnt modplay64 use PWM in one of its sid modes? On Sat, 18 Nov 2000, Richard Atkinson wrote: > Has anyone ever used the SID's phase-accumulating oscillators together > with a fast frequency register routine to generate phase-modulated sounds? > > I'm thinking about the possibilities of running a tight loop constantly > re-writing the high frequency register to add different values to the > phase-accumulating oscillators in triangle waveform mode to produce > arbitrary 11 bit waveforms. > > The slew rate is limited by the maximum number you can add to the > oscillators every cycle, which produces 4kHz triangle waves. However, a > sinusoidal wave with that gradient at t=0 wouldn't be much lower, and > there are all sorts of other noises one can imagine. > > This can all done even better on SuperCPU machines where you can write to > the sound chip every 1MHz bus cycle. > > > Richard > > - > This message was sent through the cbm-hackers mailing list. > To unsubscribe: echo unsubscribe | mail cbm-hackers-request@dot.tml.hut.fi. > - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail cbm-hackers-request@dot.tml.hut.fi.
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