> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
Behalf
> Of lee@baudalign.com
> Sent: 17 August 2009 05:09
> To: piclist@mit.edu
> Subject: [PIC] Adding PWM figures; stereo to mono?
> 
> G'day all, long-time lurker trying to get back into the basics of
PICs...
> 
> A question on whether theory would translate into practice; I'm
looking at
> a project that has stereo sound output via two PWM channels with RC
> filters on the end.  Now, I'm only going to be driving a single
speaker,
> but want to keep the two sound streams and merge them.
> I've physically tested combining the analogue out of the two RC
filters,
> and also combining the "digital" outputs of the two PWMs before going
into
> ONE RC filter; my theory now is, can I get the numbers that are
driving
> the two PWMs and simply add them together, to drive one PWM, and still
> result in the same sound?  To my mind in theory it should work, as
this is
> essentially what is happening when you physically connect the two PWM
> outputs together, or am I missing something?

Add the PWM values and divide by two to maintain the same number of
bits.  Job done.

Regards

Mike

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