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| Paper: | AE-P2.2 |
| Session: | Echo Cancellation and Active Noise Control |
| Time: | Wednesday, May 19, 15:30 - 17:30 |
| Presentation: |
Poster |
| Topic: |
Audio and Electroacoustics: Echo Cancellation |
| Title: |
A COMBINED LPC-BASED SPEECH CODER AND FILTERED-X LMS ALGORITHM FOR ACOUSTIC ECHO CANCELLATION |
| Authors: |
James Gordy; Carleton University | | |
| | Rafik Goubran; Carleton University | | |
| Abstract: |
This paper presents a novel acoustic echo canceller structure based on combining the Filtered-X LMS algorithm with an LPC-based speech coder for use in videoconferencing and VoIP. The algorithm updates coefficients using filtered versions of the input and error signals obtained by directly tapping the short-term excitation signal from the speech decoder, and by filtering the error signal with a bank of FIR decorrelation filters constructed from the LPC synthesis filter coefficients. The proposed algorithm was implemented using ITU G.729, and simulation results with 2000-tap room impulse responses show a faster and more constant rate of convergence than NLMS using speech input signals and an average 10 dB greater ERLE observed during convergence. |
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