[sdiy] Frequency modulation vs Phase mod, was: Buchla 295 10-band comb filter topology

[Donald Tillman]

> On Nov 27, 2022, at 5:44 AM, Ingo Debus via Synth-diy <synth-diy at synth-diy.org> wrote:
> 
> We see that the waveforms of all keys except the highest key look similar, but not exactly the same. The highest key waveform looks very different. Maybe this is just a lowpass filter effect of the DX7 (certainly not of the scope, this is a 60 MHz scope). The frequency of the highest key is about 2 kHz.

That waveform has a heavy 10th harmonic going on.

And for a 2 kHz note, that would be 20 kHz.

  -- Don
--
Donald Tillman, Palo Alto, California
https://www.till.com