The background music we usually hear in parks, scenic spots, shopping malls, amusement parks, and other places is not very pleasant to listen to, and sometimes it is even very harsh. In some bad weather conditions, we can only hear the sound of the speaker "hissing". This is also a common problem in the public broadcasting industry: poor sound quality, delayed sound, poor communication effect, and susceptibility to adverse weather conditions for long-distance transmission. In some places with high requirements for sound, either public broadcasting is not needed, or a set of foreign equipment needs to be purchased and used at a huge cost. This not only increases costs, but also slow after-sales maintenance response and no guarantee of use.

公共广播系统有噪声如何解决

How to Solve Noise in Public Broadcasting System

一、购买广播设备

1、 Purchase broadcasting equipment

系统广播设备性能指标良好。抗干扰能力强的产品。广播设备的抗干扰能力取决于抑制噪声的能力，这取决于广播设备的电路。所用材料的制造工艺和限制。所以如果预算允许的话。想要更好的效果，建议购买更好的广播设备，一分钱一分货，永远不变的道理。

The performance indicators of the system broadcasting equipment are good. Products with strong anti-interference ability. The anti-interference ability of broadcasting equipment depends on its ability to suppress noise, which depends on the circuit of the broadcasting equipment. The manufacturing process and limitations of the materials used. So if the budget allows. For better results, it is recommended to purchase better broadcasting equipment, with the principle of "one penny, one penny, and the same forever".

二、正确连接设备间的信号线

2、 Correctly connect signal wires between devices

通过设备质量，还要注意设备信号线之间的连接。如果连接不正确或不正确，即使是性能好的设备也很难发挥其优良的品质。

Through the quality of the equipment, attention should also be paid to the connection between the signal lines of the equipment. If the connection is incorrect or incorrect, it is difficult for even high-performance devices to achieve their excellent quality.

接地是抑制噪音和干扰，提高可靠性的重要技术措施。正确的接地不仅可以抑制干扰对系统的影响，还可以抑制广播设备的外部辐射干扰；相反，错误的接地会导致严重的干扰，甚使广播设备无法正常工作。所有的电力电缆和信号电缆都要用金属管保护，这样才能起到一定的屏蔽作用。

Grounding is an important technical measure to suppress noise and interference, and improve reliability. Proper grounding can not only suppress the impact of interference on the system, but also suppress external radiation interference from broadcasting equipment; On the contrary, incorrect grounding can cause serious interference and even prevent broadcasting equipment from working properly. All power and signal cables must be protected with metal tubes in order to have a certain shielding effect.

三、不要随意焊接屏蔽线

3、 Do not weld shielding wires randomly

在机房设备的安装过程中，屏蔽线不应随意焊接，否则容易形成闭环回路，造成系统噪声问题。防止闭环回路形成的有效方法；(1)屏蔽层一端接地(一般在信号输入端)，另一端开路；(2)区分外壳的接地点.信号接地点几个接地点。

During the installation process of equipment in the computer room, shielding wires should not be welded randomly, otherwise it is easy to form a closed-loop circuit and cause system noise problems. Effective methods to prevent the formation of closed-loop circuits; (1) One end of the shielding layer is grounded (usually at the signal input end), and the other end is open circuit; (2) Distinguish between the grounding points of the casing and the signal grounding points.

四、净化电源

4、 Purification power supply

设计电源时，应设计单独的电源变压器;无条件供电时，可独立供电一组电源，与空调配套.分离照明等设备，或使用隔离电源变压器，或在广播设备的电源输入端安装滤波器来过滤噪声。

When designing the power supply, a separate power transformer should be designed; When unconditionally supplying power, a set of power sources can be independently supplied, matched with air conditioning, separated from lighting and other equipment, or isolated power transformers can be used, or filters can be installed at the power input of broadcasting equipment to filter noise.

五、系统隔离

5、 System isolation

广播电台经常使用电话线传输音频广播直播信号。由于不同的子系统有自己独立的接地系统，一旦两个系统连接到接地线上，就必然会形成接地噪声。

Radio stations often use telephone lines to transmit audio broadcast live signals. Since different subsystems have their own independent Earthing system, once the two systems are connected to the grounding wire, grounding noise will inevitably form.

另一方面，由于平内两个子系统互连，即使用单端屏蔽接地。无法解决长距离传输引起的辐射干扰噪声，的辐射干扰噪声，尤其是使用大型电话网络传输时。此时，良好的措施是采用隔离法，在两个系统之间安装音频隔离变压器，使其相互隔离。

On the other hand, due to the interconnection of the two subsystems within the plane, a single ended shield grounding is used. Unable to solve the radiation interference noise caused by long-distance transmission, especially when using large telephone networks for transmission. At this point, a good measure is to use the isolation method and install an audio isolation transformer between the two systems to isolate them from each other.

六、日常维护

6、 Daily maintenance

定期检查和测试背景音乐功能，确保系统功能正常使用;定期测试扬声器电路，确保扬声器电路处于正常状态，有效避免在紧急情况下正常使用；考虑到电子设备容易受到灰尘的影响，在使用设备时需要定期清洁。清洁灰尘时，应使用专用工具，注意不要将灰尘转移到设备中。

Regularly check and test the background music function to ensure the normal use of system functions; Regularly test the speaker circuit to ensure that it is in normal condition and effectively avoid normal use in emergency situations; Considering that electronic devices are susceptible to dust, regular cleaning is necessary when using the equipment. When cleaning dust, special tools should be used and attention should be paid not to transfer dust into the equipment.

公共广播系统的终呈现效果和设备质量、安装、调试和后期维护有关，以防止噪音.小声，以上6点一定要注意。

The final presentation effect of the public broadcasting system is related to equipment quality, installation, debugging, and post maintenance to prevent noise and low noise. The above six points must be noted.

其实公共广播的传输问题，业内也进行了多次的理论和实践，下面小编就给大家几种可以公共广播传输问题的有效可行的方法：

In fact, the transmission problem of public broadcasting has also been theoretically and practically studied multiple times in the industry. Below, the editor recommends several effective and feasible methods for public broadcasting transmission problems:

1.音源转换数字信号传输。将音源用数字信号进行存储，从音源到主机到功放传输使用网络信号，这主要是可以减少音源在传输转换过程中的损耗。

1. Audio source conversion digital signal transmission. Storing the audio source using digital signals and transmitting it from the audio source to the host to the power amplifier using network signals can mainly reduce the loss of the audio source during the transmission and conversion process.

2.对于较短距离传输的，可以采用定阻的喇叭。定阻喇叭不加线间变压器，对传输过来的声音不做二次处理，减少声音损耗，音质相对也就提高了。

For short distance transmission, a fixed resistance horn can be used. The fixed resistance horn does not add a line to line transformer and does not perform secondary processing on the transmitted sound, reducing sound loss and relatively improving sound quality.

3.传输线根据环境不同选择直径不同的线，越恶劣的环境选择越粗的线。常规rvv2*1.5的线，室外采用rvv2*2.5的线可以基本保证声音的传输效果。

3. Choose transmission lines with different diameters based on the environment, and choose thicker lines for more harsh environments. Conventional indoor use of rvv2 * 1.5 cables, while outdoor use of rvv2 * 2.5 cables can basically ensure sound transmission efficiency.

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