公共廣播音響一般就是指在大型建筑中，如、機場、火車站、展覽中心、綜合辦公區等用于播放背景音響、廣播通知等，不管是使用范圍還是使用時間都是很廣很大的，那么就很有可能出現噪音問題，下面來分析一番。
Public broadcasting sound generally refers to the background sound and broadcasting notice used in large-scale buildings, such as shopping malls, airports, railway stations, exhibition centers, comprehensive office areas, etc. whether it is used in a wide range or time, it is likely to have noise problems. Let's analyze it below.
話筒輸入信號源
Microphone input signal source
檢查方法：
Inspection method:
將話筒信號輸入線依次拔掉，如有線話筒或者無線話筒等；然后檢查音箱是否還有噪音，判斷噪音是哪一路話筒引入系統的；
Unplug the microphone signal input line in turn, such as wired microphone or wireless microphone; Then check whether the speaker still has noise, and judge which microphone is the source of the noise;
解決方案：
Solution:
無線話筒引入，有可能是無線話筒的使用頻段有干擾造成噪音，如果無線話筒能夠調整頻率的話，調整頻率測試；
The introduction of wireless microphone may be caused by the interference of the frequency band of wireless microphone. If the wireless microphone can adjust the frequency, adjust the frequency test;
也可能是接收機接地不好造成的噪音，如果接收機固定到機柜了也有可能造成噪音，將接收機從機柜拆下，與機柜隔離測試檢查噪音是否消失。如果消失的話，將接收機墊紙或者泡沫，放到其他設備或者托盤上。
It may also be the noise caused by the poor grounding of the receiver. If the receiver is fixed to the cabinet, it may also cause noise. Remove the receiver from the cabinet and test it to check whether the noise disappears. If it disappears, pad the receiver with paper or foam and put it on other equipment or tray.
有線話筒引入，一般是有線話筒線過長（四五十米及以上）引起的，更換短話筒線測試，長有線話筒線引入的噪音一般不好處理，長話筒線鋪設的時候一般要求使用質量好的RVVP（兩芯帶屏蔽）線纜，在話筒線與前置放大器之間增加音頻隔離器有可能會有幫助。
The introduction of wired microphone is generally caused by the long wired microphone line (40-50 meters and above). Replace the short microphone line for test. The noise introduced by the long wired microphone line is generally difficult to deal with. When laying the long microphone line, it is generally required to use high-quality RVVP (two core shielded) cable. It may be helpful to add an audio isolator between the microphone line and the preamplifier.
功放或者前置放大器
Power amplifier or preamplifier
檢查方法：
Inspection method:
在不接入音源的情況下，也就是說前置放大器沒有任何輸入信號源，前置放大器與功放之間只有一根信號線，如果
山東公共廣播音響還有噪音，將線拔掉，檢查音箱是否還有噪音。
When the sound source is not connected, that is to say, the preamplifier has no input signal source, and there is only one signal line between the preamplifier and the power amplifier. If there is still noise in Shandong public radio, unplug the line and check whether there is still noise in the speaker.
解決方案：
Solution:
如果噪音消失，那問題出在前置放大器上，如果有其他的前置放大器代替測試一下，發回前置放大器維修或者更換備用機。如果還有噪音，那問題出在功放上，如果有其他功放代替測試，有問題功放發回公司維修或者更換備用機。
If the noise disappears, the problem lies in the preamplifier. If there is another preamplifier to replace the test, send it back to the preamplifier for maintenance or replace the standby machine. If there is still noise, the problem lies in the power amplifier. If there are other power amplifiers to replace the test, the power amplifier with problems will be sent back to the company for maintenance or replacement of the standby machine.
The common problems of public address sound - the problem of noise in speakers is explained here. If you need to buy or have installation and maintenance problems, you can follow our website http://www.zkvd.cn Come and contact us for advice.
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