[sdiy] Digital accumulator VCO core?

Mike Bryant mbryant at futurehorizons.com
Tue Feb 16 12:06:18 CET 2021


I wouldn't be surprised at all - I write these algorithms for some of these companies.  That's my job.   Been doing DSP since 1974, in frequencies from sub-audio to r.f.

-----Original Message-----
From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of Brian Willoughby
Sent: 16 February 2021 01:29
To: SYNTH DIY
Subject: Re: [sdiy] Digital accumulator VCO core?

On Feb 15, 2021, at 14:09, Mike Bryant wrote:
> And you don't just use an FFT to do autotune, that's merely a starting point if you want to do it in real time, as it would be for a real time spectral gate.  Some of the best systems don't even use an FFT at all nowadays.

You would perhaps be surprised by how many algorithms use FFT behind the scenes, without making it obvious. Impulse-based convolution (incl. reverbs) use FFT to vastly reduce the CPU usage below the textbook convolution math.

... and of course autotune is more than just FFT. It's the extra stuff that can be expensive compared to FFT.

Brian Willoughby


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