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Re: [ARSCLIST] stereo or double mono
Dave Rice wrote:
Hi Arsc-L,
Does anyone know any software or process where I could quickly
analyze a stereo audio file and find out if it has two different tracks
(stereo) or if it is just double mono. I have a number of audio files
that were recorded digitally which I suspect are double mono but is
there a way to make sure. It seems like a piece of software could just
subtract left from right and if the difference is 0, then double mono.
Thanks,
There are easy cases, there are difficult ones and there are impossible
ones.
If one channel is duplicated, then take any substantial segment and
difference the two channels. The result is null.
If the duplication is imperfect - different levels, analogue noise,
high-frequency loss on the left (outer) channel of tape, etc. - then
determining dual-mono is tougher. If only amplitude change then the
difference will be the mono signal at low level; or you can normalize
both channels to the same value and difference them to get a null.
Near-impossible cases are those which are neither conventional stereo
nor dual-mono. Narrow-separation stereo like binaural often is more
effective as monaural; otherwise, judicious additional separation in
processing can help to decipher/understand the result.
It would be straightforward to write a program to check truly identical
channels since the bytes would be repeated. Add even a bit of analogue
noise and I'd not even try to automate the process.
Mike
--
mrichter@xxxxxxx
http://www.mrichter.com/