[sdiy] Variable-rate drum sample playback

[mark verbos]

I’m still a little confused on this whole µ-Law DAC thing. Is it the same net effect as the "DAC followed by VCA swept by the data lines" system that the 909 cymbals used?
Couldn’t you do that too? (not that there’s anything wrong with what you’ve done)


Mark


> On Jun 25, 2018, at 11:06 AM, Tom Wiltshire <tom at electricdruid.net> wrote:
> 
> There was a discussion recently about drum sample playback that got me inspired to have a play with it. I was asking about the u-Law DAC here as well, but in the end, I didn’t bother, at least not yet. I wrote up my experiment on my website:
> 
> https://electricdruid.net/experiments-with-variable-rate-drum-sample-playback/
> 
> What I found quite cool was that it’s possible to get three separate samples *each with their own variable sample rate* into a single PIC. That’s not half bad!
> That’s using 4K samples and a 16K chip (so three samples leaves 4K for code). That means the 8K samples for things like the Ride cymbal would probably need a chip of their own - but still, you can wrap up the sample memory, the DAC, and the VCO that clocks it all onto a single chip.
> 
> Hope you like it. I don’t know whether I’ll take the experiment any further - maybe one day.
> 
> Tom
> 
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