Filter bank optimization for acoustic echo cancellation

A computer-readable memory containing instructions which, when executed by one or more processors, performs a method for adaptively filtering an echo-containing audio signal to reduce echo, the method comprising the steps of:

• splitting an echo-containing near-end audio signal and an echo-causing far-end audio signal into K frequency bands using an audio echo canceller including a first bank of analysis filters for filtering the near-end audio signal and a second bank of analysis filters for filtering the far-end audio signal, each bank of filters having a frequency response minimizing echo residual gain;
• generating an echo estimate for each of the K frequency bands using the audio echo canceller;
• subtracting the echo estimate from the echo-containing audio signal band for each of the K frequency bands using the audio echo canceller to provide K echo-canceled output signals;
• and
• summing the K echo-canceled output signals using the audio echo canceller to produce a full-band echo-canceled signal.