In a Huawei video conference, which of the following may cause echoes or even high-pitched noises when the local participant speaks? (Choose all that apply.)
A.
The endpoint's input volume is lower than the minimum energy threshold required for echo cancellation.
B.
Another participant whose speaker is turned off is at the local site.
C.
An audio loop exists. The external audio device feeds back the sound from the endpoint output port to the endpoint input port.
If the input volume falls below the echo canceller’s detection threshold, the device can’t identify and suppress return audio, leading to echoes or squealing.
An audio loop, where output is fed back into the input, directly causes echo and feedback noise.
Placing the microphone too close to the speaker allows direct pickup of its output, resulting in echo and potential high-pitched feedback.
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