会议室分会场的音响设备包括会议终端及相关外部设备，设备种类及功能大同小异。下面来讲讲常见
会议音响系统中出现的噪音与干扰处理。
The audio equipment of the conference room and sub venues includes conference terminals and related external equipment, and the equipment types and functions are similar. Let's talk about the noise and interference processing in common conference audio systems.
1、噪声大。它影响声音的清晰度、柔和度和明亮度，严重时会掩盖了会场的声音。
1. The noise is large. It affects the clarity, softness and brightness of the sound, and in serious cases, it will cover up the sound of the meeting place.
本底噪声。由于增益过大、采用自动增益控制方式、阻抗不匹配等，都会出现本底噪声。
Background noise. Background noise will occur due to excessive gain, automatic gain control, impedance mismatch, etc.
麦克风&濒诲辩耻辞;扑&谤诲辩耻辞;声。麦克风是扩音系统的个环节，其信号质量的好坏直接影响到整个会议效果，因此要根据其特点和性能、声源重现的特征以及各声源之间的相对关系合理选择和设置。对于破音较强的发言者，应选用防&濒诲辩耻辞;扑&谤诲辩耻辞;声的麦克风。
The microphone "pours". The microphone is the first link of the public address system. Its signal quality directly affects the whole conference effect. Therefore, it should be reasonably selected and set according to its characteristics and performance, the characteristics of sound source reproduction and the relative relationship between various sound sources. For speakers with strong breaking sound, microphones with anti "flapping" sound shall be selected.
2失真大。它与设备的非线性失真和人为因素有关。其特征是声音嘶哑、破损、尖细刺耳，严重时会影响声音的清晰度、柔和度、明亮度、丰满度和现场感。引起失真的原因是多方面的，如麦克风的灵敏度过高、摆放位置不合适、具有幻像电源的麦克风供电不正常、调音台的电平调整过大、均衡器的调整不适当、设备之间的阻抗不匹配等。
2 large distortion. It is related to the nonlinear distortion of equipment and human factors. It is characterized by hoarseness, damage and sharp and harsh sound. In serious cases, it will affect the clarity, softness, brightness, fullness and sense of presence of the sound. There are many reasons for distortion, such as high sensitivity of microphones, improper placement, abnormal power supply of microphones with phantom power supply, excessive level adjustment of mixer, improper adjustment of equalizers, and impedance mismatch between devices.
3、电平不规范。在调试之前没有对调音台、均衡器等设备进行调校，造成信号电平过高或过低。另外，将不平衡的线路输出与平衡的线路输入直接连接，造成信号电平下降。
3. The level is not standard. Before commissioning, the mixer, equalizer and other equipment were not adjusted, resulting in high or low signal level. In addition, the unbalanced line output is directly connected to the balanced line input, causing the signal level to drop.
4、频响不均匀。它与设备的频响指标和人为因素有关，如麦克风的指向偏离声源、中频和低频衰减太多、麦克风传输线过长等，都将影响声音还原的清晰度、层次感、丰满度。
4. The frequency response is uneven. It is related to the frequency response index of the equipment and human factors, such as the direction of the microphone deviates from the sound source, too much attenuation of the medium and low frequencies, and the microphone transmission line is too long, which will affect the clarity, layering and fullness of the sound restoration.
5、声音比例失调。如果总控室、主会场、发言的分会场叁者之间的声音比例失调，就会影响其他分会场还原远程声音的平衡度，造成会议的整体效果下降。
5. The sound is out of proportion. If the proportion of voices among the main control room, the main venue and the branch venues where the speeches are made is out of proportion, it will affect the balance of the remote voice restored by other branch venues and cause the overall effect of the meeting to decline.
纵观大部分会议系统例行调试和召开会议，声音还原的质量有了明显的提高，但还是有很多会议室音响设备还存在问题，主要表现为噪声大、失真大等问题，您对此可以来了解了解
。
Throughout the routine debugging of most conference systems and the holding of meetings, the quality of sound reproduction has been significantly improved. However, there are still problems with the audio equipment in many conference rooms, mainly including large noise and distortion. You can learn about this 。
