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".
Copyrights notice
The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. Copyrights notice
Kami menyiasat pergantungan kehilangan pulangan gema yang dikehendaki pada kekerapan untuk pelbagai keadaan telekomunikasi bebas tangan dengan penilaian subjektif. Kehilangan pulangan gema yang diingini sebagai fungsi frekuensi (DERLf) ialah faktor penting dalam reka bentuk dan penilaian prestasi pembatal gema subband, dan ia adalah ukuran yang dianggap sebagai gema yang boleh diterima disebabkan oleh kehilangan elektrik dalam talian penghantaran. DERLf semasa ceramah tunggal diperolehi sebagai tahap gema terhad jalur yang dilemahkan yang subjek tidak dapati apabila mendengar ucapan hampir tamat dan gema terhad jalurnya di bawah pelbagai keadaan telekomunikasi bebas tangan. Apabila kami menyiasat DERLf semasa berbincang dua kali, subjek juga mendengar ucapan di bilik paling hujung dari pembesar suara. Gema dihadkan kepada lebar jalur 250-Hz dengan mengandaikan penggunaan pembatal gema subband. Keputusan ujian menunjukkan bahawa: (1) apabila kelewatan penghantaran adalah pendek (30 ms), komponen gema sekitar 2 hingga 3 kHz adalah yang paling tidak menyenangkan pendengar; (2) apabila kelewatan penghantaran meningkat kepada 300 ms, komponen gema sekitar 1 kHz menjadi yang paling tidak menyenangkan; (3) apabila masa bergema bilik agak lama (kira-kira 500 ms), komponen gema sekitar 1 kHz adalah yang paling tidak menyenangkan, walaupun kelewatan penghantaran adalah pendek; dan (4) DERLf semasa bercakap dua kali adalah kira-kira 5 hingga 10 dB lebih rendah daripada semasa bercakap tunggal. Penggunaan DERL inif nilai akan membolehkan reka bentuk pembatal gema subband yang lebih cekap.
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Salinan
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 (DERLf) 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 DERLf 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 DERLf 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 DERLf during double-talk was about 5 to 10 dB lower than that during single-talk. Use of these DERLf 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
Salinan
@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 (DERLf) 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 DERLf 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 DERLf 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 DERLf during double-talk was about 5 to 10 dB lower than that during single-talk. Use of these DERLf values will enable the design of more efficient subband echo cancellers.},
keywords={},
doi={},
ISSN={},
month={December},}
Salinan
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 (DERLf) 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 DERLf 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 DERLf 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 DERLf during double-talk was about 5 to 10 dB lower than that during single-talk. Use of these DERLf values will enable the design of more efficient subband echo cancellers.
ER -