Subjective Assessment of the Desired Echo Return Loss for Subband Acoustic Echo Cancellers

Sumitaka SAKAUCHI; Yoichi HANEDA; Shoji MAKINO; Masashi TANAKA; Yutaka KANEDA

Subjective Assessment of the Desired Echo Return Loss for Subband Acoustic Echo Cancellers

Sumitaka SAKAUCHI, Yoichi HANEDA, Shoji MAKINO, Masashi TANAKA, Yutaka KANEDA

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We investigated the dependence of the desired echo return loss on frequency for various hands-free telecommunication conditions by subjective assessment. The desired echo return loss as a function of frequency (DERL_f) is an important factor in the design and performance evaluation of a subband echo canceller, and it is a measure of what is considered an acceptable echo caused by electrical loss in the transmission line. The DERL_f during single-talk was obtained as attenuated band-limited echo levels that subjects did not find objectionable when listening to the near-end speech and its band-limited echo under various hands-free telecommunication conditions. When we investigated the DERL_f during double-talk, subjects also heard the speech in the far-end room from a loudspeaker. The echo was limited to a 250-Hz bandwidth assuming the use of a subband echo canceller. The test results showed that: (1) when the transmission delay was short (30 ms), the echo component around 2 to 3 kHz was the most objectionable to listeners; (2) as the transmission delay rose to 300 ms, the echo component around 1 kHz became the most objectionable; (3) when the room reverberation time was relatively long (about 500 ms), the echo component around 1 kHz was the most objectionable, even if the transmission delay was short; and (4) the DERL_f during double-talk was about 5 to 10 dB lower than that during single-talk. Use of these DERL_f values will enable the design of more efficient subband echo cancellers.

Publication: IEICE TRANSACTIONS on Fundamentals Vol.E83-A No.12 pp.2633-2639

Publication Date: 2000/12/25

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Category: Engineering Acoustics

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Sumitaka SAKAUCHI, Yoichi HANEDA, Shoji MAKINO, Masashi TANAKA, Yutaka KANEDA, "Subjective Assessment of the Desired Echo Return Loss for Subband Acoustic Echo Cancellers" in IEICE TRANSACTIONS on Fundamentals, vol. E83-A, no. 12, pp. 2633-2639, December 2000, doi: .
Abstract: We investigated the dependence of the desired echo return loss on frequency for various hands-free telecommunication conditions by subjective assessment. The desired echo return loss as a function of frequency (DERL_f) is an important factor in the design and performance evaluation of a subband echo canceller, and it is a measure of what is considered an acceptable echo caused by electrical loss in the transmission line. The DERL_f during single-talk was obtained as attenuated band-limited echo levels that subjects did not find objectionable when listening to the near-end speech and its band-limited echo under various hands-free telecommunication conditions. When we investigated the DERL_f during double-talk, subjects also heard the speech in the far-end room from a loudspeaker. The echo was limited to a 250-Hz bandwidth assuming the use of a subband echo canceller. The test results showed that: (1) when the transmission delay was short (30 ms), the echo component around 2 to 3 kHz was the most objectionable to listeners; (2) as the transmission delay rose to 300 ms, the echo component around 1 kHz became the most objectionable; (3) when the room reverberation time was relatively long (about 500 ms), the echo component around 1 kHz was the most objectionable, even if the transmission delay was short; and (4) the DERL_f during double-talk was about 5 to 10 dB lower than that during single-talk. Use of these DERL_f values will enable the design of more efficient subband echo cancellers.
URL: https://global.ieice.org/en_transactions/fundamentals/10.1587/e83-a_12_2633/_p

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@ARTICLE{e83-a_12_2633,
author={Sumitaka SAKAUCHI, Yoichi HANEDA, Shoji MAKINO, Masashi TANAKA, Yutaka KANEDA, },
journal={IEICE TRANSACTIONS on Fundamentals},
title={Subjective Assessment of the Desired Echo Return Loss for Subband Acoustic Echo Cancellers},
year={2000},
volume={E83-A},
number={12},
pages={2633-2639},
abstract={We investigated the dependence of the desired echo return loss on frequency for various hands-free telecommunication conditions by subjective assessment. The desired echo return loss as a function of frequency (DERL_f) is an important factor in the design and performance evaluation of a subband echo canceller, and it is a measure of what is considered an acceptable echo caused by electrical loss in the transmission line. The DERL_f during single-talk was obtained as attenuated band-limited echo levels that subjects did not find objectionable when listening to the near-end speech and its band-limited echo under various hands-free telecommunication conditions. When we investigated the DERL_f during double-talk, subjects also heard the speech in the far-end room from a loudspeaker. The echo was limited to a 250-Hz bandwidth assuming the use of a subband echo canceller. The test results showed that: (1) when the transmission delay was short (30 ms), the echo component around 2 to 3 kHz was the most objectionable to listeners; (2) as the transmission delay rose to 300 ms, the echo component around 1 kHz became the most objectionable; (3) when the room reverberation time was relatively long (about 500 ms), the echo component around 1 kHz was the most objectionable, even if the transmission delay was short; and (4) the DERL_f during double-talk was about 5 to 10 dB lower than that during single-talk. Use of these DERL_f values will enable the design of more efficient subband echo cancellers.},
keywords={},
doi={},
ISSN={},
month={December},}

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TY - JOUR
TI - Subjective Assessment of the Desired Echo Return Loss for Subband Acoustic Echo Cancellers
T2 - IEICE TRANSACTIONS on Fundamentals
SP - 2633
EP - 2639
AU - Sumitaka SAKAUCHI
AU - Yoichi HANEDA
AU - Shoji MAKINO
AU - Masashi TANAKA
AU - Yutaka KANEDA
PY - 2000
DO -
JO - IEICE TRANSACTIONS on Fundamentals
SN -
VL - E83-A
IS - 12
JA - IEICE TRANSACTIONS on Fundamentals
Y1 - December 2000
AB - We investigated the dependence of the desired echo return loss on frequency for various hands-free telecommunication conditions by subjective assessment. The desired echo return loss as a function of frequency (DERL_f) is an important factor in the design and performance evaluation of a subband echo canceller, and it is a measure of what is considered an acceptable echo caused by electrical loss in the transmission line. The DERL_f during single-talk was obtained as attenuated band-limited echo levels that subjects did not find objectionable when listening to the near-end speech and its band-limited echo under various hands-free telecommunication conditions. When we investigated the DERL_f during double-talk, subjects also heard the speech in the far-end room from a loudspeaker. The echo was limited to a 250-Hz bandwidth assuming the use of a subband echo canceller. The test results showed that: (1) when the transmission delay was short (30 ms), the echo component around 2 to 3 kHz was the most objectionable to listeners; (2) as the transmission delay rose to 300 ms, the echo component around 1 kHz became the most objectionable; (3) when the room reverberation time was relatively long (about 500 ms), the echo component around 1 kHz was the most objectionable, even if the transmission delay was short; and (4) the DERL_f during double-talk was about 5 to 10 dB lower than that during single-talk. Use of these DERL_f values will enable the design of more efficient subband echo cancellers.
ER -