Subjective Assessment of the Desired Echo Return Loss for Subband Acoustic Echo Cancellers
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概要
- 論文の詳細を見る
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.
- 社団法人電子情報通信学会の論文
- 2000-12-25
著者
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Kaneda Yutaka
Ntt Cyber Space Laboratories:(present Address) Acoustics Signal Processing At The Department Of Info
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Kaneda Yutaka
Ntt Cyber Space Laboratories
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HANEDA Yoichi
NTT Cyber Space Laboratories, NTT Corporation
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Haneda Yoichi
Ntt Cyber Space Laboratories
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Tanaka M
Graduate School Of Science And Engineering Yamaguchi University
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Kaneda Y
Tokyo Denki Univ. Tokyo Jpn
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Makino Shoji
NTT Communication Science Laboratories
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SAKAUCHI Sumitaka
NTT Cyber Space Laboratories
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TANAKA Masashi
NTT Cyber Space Laboratories
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Makino Shoji
Ntt Communication Science Laboratories Ntt Corporation
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Makino S
Ntt Communication Sci. Lab. Kyoto Jpn
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