Hi,
I have been working on multi-loudspeaker and single mic acoustic echo canceller ( more than a typical stereophonic echo canceller). I have researched and came to know that we have to decorrelate the signals in order to correctly identify the estimated echo signal (i.e replicate impulse response). So, I want to know if there are any decorrelation techniques for let's say N number of loudspeakers?
Please share the link if possible.
Regards,
Khubaib Ahmad
Hello,
Here are 2 papers that are related to your problem. They can be uploaded following this link : http://www.buchner-net.com/mcaec.html
- H. Buchner and S. Spors, "A general derivation of wave-domain adaptive filtering and application to acoustic echo cancellation," Proc. Asilomar Conference on Signals, Systems, and Computers, Pacific Grove, CA, USA, Oct. 2008.
- H. Buchner, "Acoustic echo cancellation for multiple reproduction channels: From first principles to real-time solutions," Proc. ITG Conf. on Speech Communication, Aachen, Germany, Oct. 2008. Best Paper Award.
I hope this will help,
Pascal
Pascal Scalart , thank you very much for sharing the papers. I'll let you know after studying it
You should be more cautious by referring to "decorrelation": signals having the same original source (your sound generator) are TOTALLY CORRELATED by essence! The echo is correlated to the original signal too... You seems to aim at separating correlated signals, not decorrelating, so you better use the fact they are correlated! (adaptative filtering etc.)
Guy Favill's 2020 Master's thesis has good information on this:
"Decorrelation algorithms with application to artificial reverberation"
https://odr.chalmers.se/bitstream/20.500.12380/301456/1/ACEX30%20Favill%20Guy.pdf
.
Bernard Garnier Yes the signals are correlated. But from what I have read and research, I came to a point that we have to generate certain decorrelated impulse responses (magnitude 1 and random phase) that when convoluted with input signal will generate decorrelated signals further leading to multiphonic acoustic echo cancellation.
Robert Arnold Orban , Thanks alot. I'll get back to you after studying it.
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