The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. ex. Some numerals are expressed as "XNUMX".
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The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. Copyrights notice
Un annuleur d'écho acoustique a des difficultés à s'adapter dans des conditions de bruit ou de double parole. Le processus d'adaptation nécessite une identification précise de la réponse impulsionnelle de la pièce temporairement modifiée. Pour ce faire, il a été envisagé à la fois de minimiser le paramètre de taille de pas de la méthode des moindres carrés (LMS) pour qu'il soit aussi petit que possible et de renoncer à la mise à jour des coefficients du filtre adaptatif. Cet article décrit une technique interspectrale adaptative robuste au filtrage adaptatif dans des conditions de bruit ou de double parole et pour les signaux colorés tels qu'un signal vocal. La technique cross-spectrale a été initialement développée pour mesurer la réponse impulsionnelle dans un système linéaire. Ici, nous appliquons la technique adaptative à spectre croisé pour résoudre le problème d’annulation de l’écho acoustique. Cette technique interspectrale prend la moyenne d'ensemble du spectre croisé entre les signaux d'entrée et d'erreur et le spectre croisé moyenné est divisé par le spectre de puissance moyen du signal d'entrée pour mettre à jour les coefficients de filtre. Nous avons confirmé que le signal d'écho est supprimé d'environ 15 dB, même dans des conditions de parole simultanée. Nous expliquons également que cette méthode comporte une erreur systématique due à l’utilisation d’un court bloc de temps pour estimer la réponse impulsionnelle de la pièce. Ensuite, nous étudions le chevauchement de chaque dernier demi-bloc par le premier demi-bloc suivant afin de réduire l'effet de l'erreur systématique. Enfin, nous comparons notre méthode avec la méthode Frequency-domain Block LMS (FBLMS) car les deux méthodes sont implémentées dans le domaine fréquentiel en utilisant un bloc de temps court.
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Takatoshi OKUNO, Manabu FUKUSHIMA, Mikio TOHYAMA, "Adaptive Cross-Spectral Technique for Acoustic Echo Cancellation" in IEICE TRANSACTIONS on Fundamentals,
vol. E82-A, no. 4, pp. 634-639, April 1999, doi: .
Abstract: An Acoustic echo canceller has problems adaptating under noisy or double-talk conditions. The adaptation process requires a precise identification of the temporarily changed room impulse response. To do this, both minimizing the step size parameter of the Least Mean Square (LMS) method to be as small as possible and giving up on updating the adaptive filter coefficients have been considered. This paper describes an adaptive cross-spectral technique that is robust to adaptive filtering under noisy or double-talk conditions and for colored signals such a speech signal. The cross-spectral technique was originally developed to measure the impulse response in a linear system. Here we apply in the adaptive cross-spectral technique to solve the acoustic echo cancelling problem. This cross-spectral technique takes the ensemble average of the cross spectrum between input and error signals and the averaged cross spectrum is divided by the averaged power spectrum of the input signal to update the filter coefficients. We have confirmed that the echo signal is suppressed by about 15 dB even under double-talk conditions. We also explain that this method has a systematic error due to using a short time block for estimating the room impulse response. Then we investigate overlapping every last half block by the following first half block in order to reduce the effect of the systematic error. Finally, we compare our method with the Frequency-domain Block LMS (FBLMS) method because both methods are implemented in the frequency domain using a short time block.
URL: https://global.ieice.org/en_transactions/fundamentals/10.1587/e82-a_4_634/_p
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@ARTICLE{e82-a_4_634,
author={Takatoshi OKUNO, Manabu FUKUSHIMA, Mikio TOHYAMA, },
journal={IEICE TRANSACTIONS on Fundamentals},
title={Adaptive Cross-Spectral Technique for Acoustic Echo Cancellation},
year={1999},
volume={E82-A},
number={4},
pages={634-639},
abstract={An Acoustic echo canceller has problems adaptating under noisy or double-talk conditions. The adaptation process requires a precise identification of the temporarily changed room impulse response. To do this, both minimizing the step size parameter of the Least Mean Square (LMS) method to be as small as possible and giving up on updating the adaptive filter coefficients have been considered. This paper describes an adaptive cross-spectral technique that is robust to adaptive filtering under noisy or double-talk conditions and for colored signals such a speech signal. The cross-spectral technique was originally developed to measure the impulse response in a linear system. Here we apply in the adaptive cross-spectral technique to solve the acoustic echo cancelling problem. This cross-spectral technique takes the ensemble average of the cross spectrum between input and error signals and the averaged cross spectrum is divided by the averaged power spectrum of the input signal to update the filter coefficients. We have confirmed that the echo signal is suppressed by about 15 dB even under double-talk conditions. We also explain that this method has a systematic error due to using a short time block for estimating the room impulse response. Then we investigate overlapping every last half block by the following first half block in order to reduce the effect of the systematic error. Finally, we compare our method with the Frequency-domain Block LMS (FBLMS) method because both methods are implemented in the frequency domain using a short time block.},
keywords={},
doi={},
ISSN={},
month={April},}
Copier
TY - JOUR
TI - Adaptive Cross-Spectral Technique for Acoustic Echo Cancellation
T2 - IEICE TRANSACTIONS on Fundamentals
SP - 634
EP - 639
AU - Takatoshi OKUNO
AU - Manabu FUKUSHIMA
AU - Mikio TOHYAMA
PY - 1999
DO -
JO - IEICE TRANSACTIONS on Fundamentals
SN -
VL - E82-A
IS - 4
JA - IEICE TRANSACTIONS on Fundamentals
Y1 - April 1999
AB - An Acoustic echo canceller has problems adaptating under noisy or double-talk conditions. The adaptation process requires a precise identification of the temporarily changed room impulse response. To do this, both minimizing the step size parameter of the Least Mean Square (LMS) method to be as small as possible and giving up on updating the adaptive filter coefficients have been considered. This paper describes an adaptive cross-spectral technique that is robust to adaptive filtering under noisy or double-talk conditions and for colored signals such a speech signal. The cross-spectral technique was originally developed to measure the impulse response in a linear system. Here we apply in the adaptive cross-spectral technique to solve the acoustic echo cancelling problem. This cross-spectral technique takes the ensemble average of the cross spectrum between input and error signals and the averaged cross spectrum is divided by the averaged power spectrum of the input signal to update the filter coefficients. We have confirmed that the echo signal is suppressed by about 15 dB even under double-talk conditions. We also explain that this method has a systematic error due to using a short time block for estimating the room impulse response. Then we investigate overlapping every last half block by the following first half block in order to reduce the effect of the systematic error. Finally, we compare our method with the Frequency-domain Block LMS (FBLMS) method because both methods are implemented in the frequency domain using a short time block.
ER -