[sdiy] Wavetable Design Update

[Matthew Smith]

Quoth ASSI at 05/02/11 21:46...
...
> ...and that calculates to 1.75ns for the period resolution or 1140MHz that 
> would be required at the input of the counter.  With the actual 20MHz input 
> you reach the desired pitch resolution 6 octaves from the top.  So you will 
> have to do some fractional counting by switching between two (or more) 
> counter values to extend the useful range of frequencies to at least the 
> middle octaves.  I don't know how fast the counter interrupts are on the 
> ATTiny, but it doesn't look too good for getting to the full MIDI range.

Many thanks for that!  I'm looking to get the hardware design of the 
platform sufficiently flexible that I can try both the phase accumulator 
and timer approaches.  Barring the actual EEPROMs, everything on the 
board is in-system programmable.

Question I'm starting to ask myself is whether I really *need* the full 
MIDI range. Heck, a piano doesn't do the full MIDI range and I've never 
run out of notes on one of them before! (If I were to exceed the piano 
range, it would be at the low, not the high end. I likes me some 
sub-bass ;-)

Cheers

M

-- 
Matthew Smith
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