Shulou(Shulou.com)06/03 Report--

There may be echoes in the use of cloud video conferencing, or even screams due to mutual interference, affecting the effectiveness of the meeting!

From a physical point of view, the main reason for the echo is that the microphone of the video conference terminal collects the voice of the speaker for the second time, that is, the microphone first collects the sound of the speaker, and then collects the voice of the speaker played in the same physical space for the second time. The interval between the two sounds is relatively short, so it is easy to produce echoes, and even whistling sounds are produced in serious cases. In addition, there are some reasons for the poor sound processing effect of the joining equipment.

In view of the above phenomena, different ways to participate in the meeting can be eliminated by taking relevant measures.

1. PC / mobile / flat panel participation will be avoided.

If the echo is caused by the unsatisfactory sound processing effect of the PC / mobile phone / tablet itself, you can generally mute the sound; there may be electromagnetic interference between the mobile devices, so keep a certain distance between the mobile devices during the meeting to avoid interference caused by being too close. In addition, you can disable the audio of the computer itself, use a conference microphone with a separate sound card or omni-directional microphone instead, and use only the microphone or omni-directional microphone to be responsible for the input and output of sound.

2. A single video terminal will attend the meeting.

In a conference room composed of a single device, the system microphone is mainly avoided from being too close to the audio output of the monitor / TV loudspeaker, which may interfere with each other and cause noise. In addition, the appropriate meeting microphone equipment can be selected according to the conference room scene in a single conference room, and users should carefully select hundreds of equipment on the market for standard conference rooms. This kind of equipment basically has no echo cancellation module, and the meeting effect is very poor.

3. Multiple devices participate in the same physical space

As shown in the figure below, due to the access of multiple participants to multiple participants, some participants in the conference room need to use their own mobile computer screen, resulting in interference and repetition due to the repetition of the sound of the mobile device and the indoor terminal. It is generally recommended that participants connect with headphones to avoid crosstalk between the devices. If there are multiple devices participating in the unified physical space, the microphone and sound of one device can be kept in normal use when speaking, and the other devices can be muted and sound minimized, which can effectively avoid echoes.

In the three scenarios introduced above, the methods to avoid echoes are relatively simple and convenient. In addition, in large conference rooms, these echoes are generally taken into account in decoration and audio layout. In addition, the anti-interference of the equipment is also extremely important, and we need to pay more attention to it in use.

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