[sdiy] VSM201 Vocorder Question

[Simon Brouwer]

Note that in this case the audio signal is what is pulse width modulated, not
the controlling signal!
 
 
Best regards
Simon

> Op 2 januari 2016 om 21:44 schreef Tom Wiltshire <tom at electricdruid.net>:
>
>
> +1 totally agree
>
> If you can produce a 1% pulse width, you still only get -40dB. You need to get
> a 0.01% pulse wave to get -80dB. Tough to do. Not impossible, but awkward
> enough to make it stop seeming like such a great solution.
>
> I've thought about this a bit because of using the PIC's PWM module so much.
> The best case output from that is either 8-bit or 10-bit, which means that
> -60dB is about as good as I'd get using it for a VCA, and that implies having
> a switching frequency which is much too low (31KHz) for many jobs.
>
> Tom
>
>
> On 2 Jan 2016, at 19:42, rburnett at richieburnett.co.uk wrote:
>
> > <snip>
> > Control range of PWM'd CMOS switches acting as VCAs isn't that great though.
> >
> > -Richie,
> >
>
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