Mike Hawkshaw wrote:

>> Marcel Birthelmer: 
>> 
>> what would be a good way to convert stereo audio to mono? This can be
>> either PCM or as an analog circuit. I'm trying to keep things as simple
>> as possible, so some noise (not too much) is ok.
> 
> To produce a mono signal from a stereo one, you simply need to add the left
> and right siganls together (which is what your ears would do to get the mono
> signal if you were a long way away from the loudspeakers).
> 
> You could do this using an op amp (ne5534 or better) as an adder or possibly
> by taking the left and right pcm values and adding them together and scaling
> before conversion.

Two resistors can do that, depending on your source outputs and the input
you're going to.

Gerhard

-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist