[sdiy] VSM201 Vocorder Question

[Gordonjcp]

On Sat, Jan 02, 2016 at 02:10:10PM -0800, rsdio at audiobanshee.com wrote:
> A PIC that runs at 48 MHz, e.g., for USB, can manage a 46.875 kHz PWM rate. That's enough to just satisfy Nyquist. Unfortunately, the filter would probably cost more than a true VCA, but if there are cheap low-pass filters oriented towards Compact Disc 44.1 kHz sampling then you might be able to pull it off.
> 
> WIthout a fancy, brick-wall filter, you'd lose the ideal 20 kHz bandwidth and drop into the audible range, which 31 kHz certainly would require.

31kHz would give you a Nyquist frequency of around 15kHz and your highest band is probably only going to be 12kHz at most.

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Gordonjcp