Determination of the Coherence of Audio Signals

A computer program product comprising a tangible computer readable medium having computer code thereon for estimating signal coherence, the computer code comprising:

• computer code for detecting sound generated by a sound source, in particular, a speaker, by a first microphone to obtain a first microphone signal and by a second microphone to obtain a second microphone signal;
• computer code for filtering the first microphone signal by a first adaptive finite impulse response filter to obtain a first filtered signal;
• computer code for filtering the second microphone signal by a second adaptive finite impulse response filter, to obtain a second filtered signal;
• and
• computer code for estimating the coherence of the first filtered signal and the second filtered signal;
• wherein the first and the second microphone signals being filtered such that the difference between the acoustic transfer function for the transfer of the sound from the sound source to the first microphone and the transfer of the sound from the sound source to the second microphone is compensated in the first and second filtered signals.

A signal processing system, comprising

• a first adaptive Finite Impulse Response filter, configured to filter a first microphone signal obtain a first filtered signal;
• a second adaptive Finite Impulse Response filter, configured to filter a second microphone signal to obtain a second filtered signal;
• and
• coherence calculation logic configured to estimate the coherence of the first filtered signal and the second filtered signal;
• wherein
• the first and the second adaptive filters are configured to filter the first and the second microphone signals such that the difference between the acoustic transfer function for the transfer of the sound from a sound source to the first microphone and the transfer of the sound from the sound source to the second microphone is compensated in the first and second filtered signals.