[sdiy] Analog bandwidth

Tom Wiltshire tom at electricdruid.net
Sat Feb 22 20:35:24 CET 2014


Ok, I get that, so far. But I still don't get how multiplying some ultrasonic noise so that difference frequencies finish up back in the audio band helps improve my fast envelope attacks at all. "Make them more noisy" - yeah, ok, maybe. "Make them better"? I'm not seeing it.

On 22 Feb 2014, at 17:48, "cheater00 ." <cheater00 at gmail.com> wrote:

> The theory is that if you multiply noise which is just above 20 kHz
> (that's your noise), by something that has spectrum between 0 and 20
> kHz (that's the envelope), then you get sum and difference. The
> difference is at frequency, say, 20 kHz - (something between 0 and 20
> kHz), and therefore ends up in the audio band again.
> 
> Cheers,
> D.



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