[sdiy] DCO Question

[Gordonjcp]

On Fri, Nov 03, 2017 at 03:04:40PM -0400, Ben Bradley wrote:
> I forget where I read this, either the archives for SDIY or the
> MUSIC-DSP list, but one way to do non-aliased waveforms with DDS and
> wavetable lookup is (for each waveform) to have a separate wavetable
> for every octave. The lowest octave(s) will use the full-bandwidth
> wavetable, and the wavetables used in the higher octaves will be
> bandlimited - the highest octave will be a sine wave, the second
> highest also has the second harmonic of the original, the third
> highest has the second, third and fourth harmonics, and so on. This
> uses a lot more wavetable memory, but memory is a lot cheaper than it

That's mipmapping which is how stuff like the Ensoniq ESQ1 and Korg DW
series do it.

-- 
Gordonjcp