Mark Rages wrote:

>>> Be warned, this will introduce phasing artifacts with most stereo
>>> material (a nasty smearing sound in the high frequencies).
>>
>> Can you explain this please ?
>>
>> I would have thought that unless the sound source was moving at the time of
>> the recording the phase relationship between the L and R signals would be
>> fixed and no "phasing artifacts" would be produced ?
>>
>> Unless you mean that at certain frequencies the fixed phase difference could
>> be 180deg and the signal would be cancelled in the result ?
> 
> If you use two microphones are used to record the same sound, and they
> are at different distances from it, you create a comb filter:

It depends on the recording technique. Some create this effect, others not
or much less, as some recording techniques use microphones at the same
location. See also
http://en.wikipedia.org/wiki/Microphone#Stereo_recording_techniques and
look for "mono compatible" or similar.

I think that most modern pop music is not recorded stereo. Whatever there
is in terms of stereo is probably processed stereo, with of course quite
arbitrary results when mixed into a mono signal.

Gerhard

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