更新时间：2023-06-25
文章来源：https://www.wenguangzhineng.com/
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现在，大多数会议室和剧院都有一个标准配置，即声音，它有许多用途。关于这个问题没有必要多说。但是除了这些用途之外，声音还会受到干扰吗?会议现场设备包括会议终端及相关外部设备，设备类型及功能基本相同。因此，会议音响信号的传输过程分为两部分：
Nowadays, most conference rooms and theaters have a standard configuration called sound, which has many uses. There is no need to say more about this issue. But besides these purposes, will sound still be disturbed? The on-site equipment for the conference includes conference terminals and related external devices, with similar types and functions. Therefore, the transmission process of conference audio signals is divided into two parts:
这一端的声音由麦克风拾取，人声被转换成电信号并发送到混音器。经过放大、混音、分配、音质修改和效果处理后，分为两个通道：一个通道的信号被送到该端的功率放大器进行放大，然后由扬声器恢复为声音;另一端由混音器放大，然后由扬声器(aux)输出。
The sound at this end is picked up by the microphone, and the human voice is converted into an electrical signal and sent to the mixer. After amplification, mixing, distribution, sound quality modification, and effect processing, it is divided into two channels: the signal from one channel is sent to the power amplifier at that end for amplification, and then restored to sound by the speaker; The other end is amplified by a mixer and then output by a speaker (AUX).
另一部分：会议终端对远端发送的信号进行处理后，会议音响信号进入混音器进行处理，然后送到本地端的功率放大器进行放大，由扬声器恢复成声音。根据以上分析，混频器是各个信号处理过程的汇合点。如何调整混音器的各个键和功能键是调试的关键。
Another part: After the conference terminal processes the signal sent from the remote end, the conference audio signal enters the mixer for processing, and then is sent to the local power amplifier for amplification, which is restored to sound by the speaker. According to the above analysis, the mixer is the convergence point of various signal processing processes. How to adjust the various keys and function keys of the mixer is the key to debugging.
在会议音响信号传输过程中，存在着许多干扰，如电源干扰、设备干扰、光干扰等。
There are many interferences in the transmission of conference audio signals, such as power interference, equipment interference, light interference, etc.
1.电源干扰
1. Power interference
电源接地不良、设备间地线接触不良、阻抗不匹配、电源未净化处理、音频线与交流线敷设在同一管道、沟渠或桥架内，会对音频信号产生杂波干扰，形成低频交流“嗡嗡”声。
Poor grounding of the power supply, poor contact of ground wires between equipment, impedance mismatch, untreated power supply, and the laying of audio and AC lines in the same pipeline, ditch, or bridge can cause noise interference to the audio signal, forming low-frequency AC "buzzing" sound.
2.设备间干扰
2. Equipment to equipment interference
“口哨”是由扬声器和麦克风之间的正反馈引起的。主要原因是话筒离扬声器太近或话筒指向扬声器。当声源延迟时产生“空声”。例如，话筒不仅拾取声源信号并接收放大和恢复的信号，或者两个与声源距离不同的话筒拾取同一声源的信号，或者一个话筒的信号会产生相应的延迟。这些信号叠加后，一些频率分量将相互抵消，从而产生“空音”。
Whistle "is caused by positive feedback between the speaker and microphone. The main reason is that the microphone is too close to the speaker or the microphone is pointing towards the speaker. When the sound source is delayed, "empty sound" is generated. For example, microphones not only pick up sound source signals and receive amplified and restored signals, or two microphones with different distances from the sound source pick up signals from the same sound source, or the signal from one microphone will generate corresponding delays. After these signals are superimposed, some frequency components will cancel out each other, resulting in "empty sound".
3.照明干扰
3. Lighting interference
现场镇流器间歇启动的照明灯在灯管激发时会产生高频辐射，并通过麦克风及其引线串联，产生“dada”声;如果话筒线太靠近灯线，也会发出“吱吱”声;此外，还会发生高频电磁干扰。
The lighting lamp that is intermittently activated by the on-site ballast will generate high-frequency radiation when the lamp tube is excited, and it will be connected in series through the microphone and its leads to produce a "dada" sound; If the microphone cable is too close to the light cable, it will also make a "squeaking" sound; In addition, high-frequency electromagnetic interference may also occur.
要恢复视频会议音响的声音，应根据声学的理论知识和不同的实际情况，灵活调整混音器和均衡器，对声音进行处理和美化，弥补声场的缺陷，创造理想的声学环境;适当调整压缩限制器，避免在突然出现大峰值信号时过载和不平衡，以弥补声场的不足，创造理想的声学环境。
To restore the sound of the video conference audio system, it is necessary to flexibly adjust the mixer and equalizer based on the theoretical knowledge of acoustics and different actual situations, process and beautify the sound, compensate for the defects of the sound field, and create an ideal acoustic environment; Adjust the compression limiter appropriately to avoid overload and imbalance in the event of sudden high peak signals, in order to compensate for the shortcomings of the sound field and create an ideal acoustic environment.
This article is dedicated by Shandong Conference Room Audio Friendship. For more relevant knowledge, please click on: https://www.wenguangzhineng.com Sincere attitude. We will provide you with comprehensive services. We will gradually contribute more relevant knowledge to everyone. Stay tuned
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