[sdiy] Variable rate waveform playback in NED synclavier

[Tom Wiltshire]

On 3 Sep 2012, at 16:00, Scott Nordlund wrote:

>> Many modern DDS chips like those from Analog Devices allow you to
>> generate variable digital clock signals both ways. The jitter resulting
>> from the quick and dirty way is very apparent when comparing the two
>> clock outputs side-by-side on an oscilloscope.
> 
> I can't see this being applicable to software, but it might be the way to go if anyone wanted to compete with the Fairlight CMI-30A. If anyone wants to start a company, it'll be a fun way to lose a lot of money.

I bet I could do it for less than the cost of a Fairlight CMI-30A! You could use a high frequency version of the scheme that Richie proposed, then use it as a clock for a fully static microprocessor. You'd need a NCO/filter/comparator/uP per voice, and the rest is software.

It'd be at least an interesting modern version of the classic variable rate scheme.

Tom