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| Publication: M.E. Knappe, and R.A. Goubran, "Steady State Performance Limitations of Full-Band Acoustic Echo Cancellers", IEEE International Conference on Acoustic Speech and Signal Processing", ICASSP 94, Adelaine, Australia, April 1994, pp. 2073-2077. |
| Abstract: Due to computational and convergence speed restraints, acoustic echo cancellers used for desktop handsfree units typically use an adaptive filter significantly shorter in length than the length of the enclosure/room impulse response it is attempting to model. A simple measurement based on this impulse response is proposed that gives the maximum obtainable depth of cancellation for a given filter length. By comparing this measurement with actual Echo Return Loss enhancement measurements for different adaptive filter lengths, the optimum filter length for a given handsfree enclosure and transducers can be determined. |