[sdiy] FW: Kawai K3 - Bandlimited Waveforms

[Scott Nordlund]

> I'd say (and this is an opinion not a statement of fact) that if it's
> got a "high" sample rate and "small" tables, then it can be viewed as
> a variable sample rate system. At least, it approximates one. This is
> the PPG scheme. In a system like this, each individual wavetable
> sample is typically repeated many times, which is roughly equivalent
> to clocking the samples out at a much slower, variable rate. In
> practice, the line blurs, since at the top of the PPG's range, it
> starts missing samples out because the sample rate isn't high enough
> (only 250KHz).
>
> Obviously the reality is that both systems have a fixed rate, and
> it's purely a way of viewing it.
 
And I would assume that the low-ish fixed rate systems that rely on 
external analog filtering and mixing (meaning something that only 
generates waveforms digitally), the Kawai K3, Korg DW-8000, ESQ-1, 
etc. do this to accomodate a single multiplexed DAC, yes? 
 
It seems to me that all the high or variable rate systems use a 
DAC per oscillator, which tends to drive them into a different
class entirely, cost and complexity wise.  But the phase accumulator
hardware can accomodate the high speed without getting too crazy,
since it's just incrementing a bunch of registers. 		 	   		  
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