A Blockless Echo Suppressor

Miura, Akira; Kobayashi, Susumu; Sato, R.; Nagata, K.

doi:10.1109/tcom.1969.1090119

Cited by 7 publications

(1 citation statement)

References 6 publications

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“…This is because, for short delays, the echo is indistinguishable from side tone, and the contribution of even the 15dB echo to the existing side tone is too small to cause noticeable degradation. This effect may be related to the results of previous experiments 13 ' 14 on the subjective effects of unsuppressed echo, which shows that, for round-trip delays up to 100ms, the round-trip echo-path loss required to provide a tolerable connection increases substantially with increasing delay.…”

Section: Mean Opinion Scoresmentioning

confidence: 53%

Subjective evaluation of unsuppressed echo in simulated long-delay telephone communications

Williams¹,

Moye²

1971

Proc. Inst. Electr. Eng. UK

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The paper describes an experiment to measure the subjective effect of unsuppressed echo to determine the improvement in echo return loss required of echo cancellers in long-delay telephone communications. Using a simulated long-delay telephone connection of 16-5dB nominal overall reference equivalent, tests were carried out over a range of conditions in which the 1-way delay varied between 50 ms and 600 ms, and the echo return loss between 15dB and 50dB. Echo-path frequency characteristics which an echo canceller might cause in practice were represented by a flat characteristic and a characteristic decreasing in loss with increasing frequency. Because of the large number of test conditions (40) in the experiment, the experimental design is unique and is described.

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Section: Mean Opinion Scoresmentioning

confidence: 53%