A Stereophonic Acoustic Echo Cancellation Algorithm Based on Sub-band Extended LMS Algorithm and Dual-Filter Structure

• Published in: 2022 IEEE 8th International Conference on Computer and Communications (ICCC) pp. 1583 - 1588
• Main Authors: Xiao, Zeping, Zhou, Yi, Ma, Yongbao, Liu, Hongqing
• Format: Conference Proceeding
• Language: English
• Published: IEEE 09.12.2022
• Subjects: Acoustics; Couplings; dual-filter; Echo cancellers; ELMS algorithm; Frequency-domain analysis; Loudspeakers; Oral communication; stereo acoustic echo cancellation; sub-band; Teleconferencing
• DOI: 10.1109/ICCC56324.2022.10065903

Acoustic Echo Cancellers are widely used in speech communication applications to cancel echoes that result from the coupling between loudspeaker and microphone. Nowadays many teleconferencing systems use two-channel audio to enhance sound realism. However, stereophonic acoustic echo cancellation (SAEC) is more difficult than its single-channel counterpart because of the high correlation between the two excitation signals. This paper proposes a SAEC algorithm with excellent convergence performance and robust double talk detection (DTD) performance, which uses an Extended LMS (ELMS) algorithm in sub-bands. By utilizing the dual-filter structure with a robust transfer logic, the proposed algorithm becomes more stable in a double-talk situation. The experimental results prove that the proposed SAEC algorithm outperforms the sub-band ELMS algorithm with pseudo-coherence and ELMS algorithm with pseudo-coherence based on block processing in frequency-domain (two-channel FLMS).