Marcel Birthelmer wrote:

>Hi all,
>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.
>- Marcel
>  
>
I think you would use an opamp with two inputs. In some applications the 
signals might be a bit out of phase giving a strange output.
I think in radio they use a mixing scheme where the left output is 
transmitted containing part of the right signal as a hack for mono-only 
radios.
I base that assumption on listening to some Beatles tracks that used a 
lot of fading, so don't take it to heart :)

--
Martin K
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