I am working on acoustic echo canceler for mobile telephony. I have two
doubts to clarify:
1) Avi perry in his book "Voice Quality Engineering in Wireless Networks"
has mentioned that although speech signal power is distributed almost
uniformly across the entire spectrum, the acoustic echo power concentrates
most of its energy in the 1700-2500 Hz range. Anybody having any idea of
the possible explanation.
2) I am searching a bulk delay estimation method (for AEC)that can be used
in the presence of heavy non-linear distortions. These non linear
distortions are introduced by : GSM codec, Speaker, Mechanical/Acoustic
coupling. I will be very thankful if anyone can guide me through.
Any good books that deal with Acoustic Echo Cancelers in wireless