expression of find peak of "cc" about tdoa

[xiongyihui]

Yes, np.abs() should be removed, unless there is a 180-degree phase difference between the two microphones.

[forest416]

Thanks for the response.

Yes. with considering 180' shift, the abs() is needed. Remove it or not, depend on the shape of signal to be considered for matching.

If 180' shift (flip over) is also considered as a match, because of microphones' positions are in opposite direction.
when two microphone are point to same direction, abs() should be removed, because the basic physics principle.

It depends on position setup of microphones.