[sdiy] wireless patching

[Quincas Moreira]

That's right, converting PWM to voltage requires filtering, so there'll
always be a bit of glide.

On Fri, May 26, 2017 at 4:25 PM, <rsdio at audiobanshee.com> wrote:

>
> On May 26, 2017, at 11:58 AM, mskala at ansuz.sooke.bc.ca wrote:
> > On Fri, 26 May 2017, Tom Wiltshire wrote:
> >> That doesn't sound too impossible given the 27MHz transmission
> frequency.
> >> The standard 50Hz PWM seems like a pretty light load for such a signal.
> How
> >> many channels can an RC controller handle? Are they multiplexed?
> >
> > I described the protocol in my earlier message.  The number of channels
> is
> > variable but typically eight.  Bandwidth would be a few kilohertz
> > depending on how much resolution you want and how much signal/noise you
> > think you can play with.  It is not a particularly bandwidth-efficient
> > encoding.  I'm sure that the bandwidth in practice is limited by
> > regulatory concerns - if you want a much higher sampling rate and you
> want
> > to do it *legally*, then you're going to either be limited to flea power,
> > or forced up into the UHF.
>
> When you say "a few kilohertz," you're talking about the encoded signal,
> not the decoded signal, right?
>
> I don't see how you can have 50 Hz PWM and get a few kHz signal out of
> that after smoothing.
>
> On that note, what is the lag time for PWM? It may not be the same term as
> latency, but the necessary smoothing for PWM means that an immediate change
> in the PWM signal does not result in an immediate change in the DC Voltage
> output. If the PWM is running at 50 Hz, I'd imagine that the signal
> bandwidth can't be any higher than 10 Hz, and probably lower.
>
> Am I missing anything?
>
> Brian
>
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at synth-diy.org
> http://synth-diy.org/mailman/listinfo/synth-diy
>



-- 
Quincas Moreira
Test Pilot at VBrazil Modular
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://synth-diy.org/pipermail/synth-diy/attachments/20170526/7a6437b2/attachment.htm>