Splitting one channel into two using 2 into 1 stereo cable giving me ZERO lags ? help !

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Now that I'm using two condenser microphone inputs to a single channel , I'm getting zero lags ! ? This shouldn't happen since I'm placing the two mics at quite a distance for audio localization . But still getting the same result and 89 degrees or 90 degrees angle each time ! Can some one share a better code of sound localization using generalized cross correlation on two condenser mics connected to your laptop? Please help! Since it is the only hurdle in my project. Even a correct algorithm or way to calculate angle from GCC information will help! Thanks!

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Answers (1)

Gabriele Bunkheila
Gabriele Bunkheila on 19 Jan 2018
Hi Ali,
A number of things could be happeninig here - low-end or built-in laptop sound cards most often have mono mic or line inputs (despite the drivers possibly suggesting otherwise). Are your acquired signals exactly identical or simply well-correlated in time? On the other hand, your cable may be a single stereo to 2x stereo instead of a stereo splitter. I suggest you check all those possible issues in isolation.
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Ali Soban
Ali Soban on 19 Jan 2018
Hi Gabriele ,
Kindly see the stereo cable image attachment in my above comment so that you possibly be getting a fair estimate to where I'm actually stuck now. No the signals are not purely identical but they maximum correlation coefficient occurs at zero phase shift i.e.
[c lag] = xcorr(L,R)
[maxC I] = max(c)
lag = lag(I)
This lag = 0 always. I don't know the reason since the signals aren't purely identical!

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