A New Subband Echo Canceler Structure

Hector PEREZ; Fumio AMANO

A New Subband Echo Canceler Structure

Hector PEREZ, Fumio AMANO

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Several recent proposals would enable us, at least theoretically, to overcome some of the limitations of transversal echo cancelers with gradient-search-based adaptation algorithms in acoustic environments. Of these, the subband echo canceler (SBEC) structure appears to be a desirable alternative because it both, reduces the computational load and speeds up convergence rates. Conventional SBECs introduce undesirable spectral gaps or aliased components, however, which degrade the echo canceler's performance. The SBEC structure we propose uses oversampling, i.e., a decimation factor smaller than the number of subbands, and complex adaptive filters. It also enables the use of large decimation factors with a relatively short delay in the sending side, keeping the local room signal undistorted. Computer simulations using actual speech signals show that by using relatively large decimation factors, in addition to reducing the computational load, convergence rates become almost independent of the statistics of the input signals.

Publication: IEICE TRANSACTIONS on transactions Vol.E73-E No.10 pp.1625-1631

Publication Date: 1990/10/25

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Type of Manuscript: Special Section PAPER (Special Issue on Communication Theory and Its Applications)

Category: Signal Processing and Image Compression

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Hector PEREZ
Fumio AMANO

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Hector PEREZ, Fumio AMANO, "A New Subband Echo Canceler Structure" in IEICE TRANSACTIONS on transactions, vol. E73-E, no. 10, pp. 1625-1631, October 1990, doi: .
Abstract: Several recent proposals would enable us, at least theoretically, to overcome some of the limitations of transversal echo cancelers with gradient-search-based adaptation algorithms in acoustic environments. Of these, the subband echo canceler (SBEC) structure appears to be a desirable alternative because it both, reduces the computational load and speeds up convergence rates. Conventional SBECs introduce undesirable spectral gaps or aliased components, however, which degrade the echo canceler's performance. The SBEC structure we propose uses oversampling, i.e., a decimation factor smaller than the number of subbands, and complex adaptive filters. It also enables the use of large decimation factors with a relatively short delay in the sending side, keeping the local room signal undistorted. Computer simulations using actual speech signals show that by using relatively large decimation factors, in addition to reducing the computational load, convergence rates become almost independent of the statistics of the input signals.
URL: https://global.ieice.org/en_transactions/transactions/10.1587/e73-e_10_1625/_p

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@ARTICLE{e73-e_10_1625,
author={Hector PEREZ, Fumio AMANO, },
journal={IEICE TRANSACTIONS on transactions},
title={A New Subband Echo Canceler Structure},
year={1990},
volume={E73-E},
number={10},
pages={1625-1631},
abstract={Several recent proposals would enable us, at least theoretically, to overcome some of the limitations of transversal echo cancelers with gradient-search-based adaptation algorithms in acoustic environments. Of these, the subband echo canceler (SBEC) structure appears to be a desirable alternative because it both, reduces the computational load and speeds up convergence rates. Conventional SBECs introduce undesirable spectral gaps or aliased components, however, which degrade the echo canceler's performance. The SBEC structure we propose uses oversampling, i.e., a decimation factor smaller than the number of subbands, and complex adaptive filters. It also enables the use of large decimation factors with a relatively short delay in the sending side, keeping the local room signal undistorted. Computer simulations using actual speech signals show that by using relatively large decimation factors, in addition to reducing the computational load, convergence rates become almost independent of the statistics of the input signals.},
keywords={},
doi={},
ISSN={},
month={October},}

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TY - JOUR
TI - A New Subband Echo Canceler Structure
T2 - IEICE TRANSACTIONS on transactions
SP - 1625
EP - 1631
AU - Hector PEREZ
AU - Fumio AMANO
PY - 1990
DO -
JO - IEICE TRANSACTIONS on transactions
SN -
VL - E73-E
IS - 10
JA - IEICE TRANSACTIONS on transactions
Y1 - October 1990
AB - Several recent proposals would enable us, at least theoretically, to overcome some of the limitations of transversal echo cancelers with gradient-search-based adaptation algorithms in acoustic environments. Of these, the subband echo canceler (SBEC) structure appears to be a desirable alternative because it both, reduces the computational load and speeds up convergence rates. Conventional SBECs introduce undesirable spectral gaps or aliased components, however, which degrade the echo canceler's performance. The SBEC structure we propose uses oversampling, i.e., a decimation factor smaller than the number of subbands, and complex adaptive filters. It also enables the use of large decimation factors with a relatively short delay in the sending side, keeping the local room signal undistorted. Computer simulations using actual speech signals show that by using relatively large decimation factors, in addition to reducing the computational load, convergence rates become almost independent of the statistics of the input signals.
ER -