The public address system is noisy because you ignored these six points

Release time:

2021-06-24

The public address system is currently a system that is required by all walks of life, including hotels, shopping malls, parks, scenic spots, and other places.
In practical use, we may find that some public address systems have a pleasant and natural sound, while others have some noise and howling. In the face of this situation, how should we handle it?
Choose high-quality broadcasting equipment from Germany Xipai Electronics International Group (Guangzhou Xipai Electronic Technology Co., Ltd.) Public Broadcasting System is trustworthy
The system broadcasting equipment shall be selected from products with good performance indicators and strong anti-interference ability. The anti-interference ability of public broadcasting equipment is determined by the noise suppression ability, and is restricted by the circuit, manufacturing process, and materials used in the broadcasting equipment. Therefore, if the budget allows and you want better results, it is recommended to purchase higher-grade broadcasting equipment. The principle that every penny is worth every penny, and it will never change.
Correctly connect the signal lines between equipment
The quality of the equipment is qualified, and attention should be paid to the connection between the signal lines of the equipment. If the connection is incorrect or inappropriate, even a device with good performance will have difficulty displaying its excellent quality. Grounding is an important technical measure to suppress noise, prevent interference, and improve reliability. Correct grounding can suppress the impact of interference on the system and also suppress outward radiated interference from broadcast equipment; Conversely, incorrect grounding can introduce serious interference and even cause broadcast equipment
Not working properly. All power and signal cables are protected by metal tubes, which can provide a certain shielding effect.
Do not weld the shield wire randomly
During the installation of equipment in the computer room, it is not necessary to weld shield wires without convenience, otherwise it is easy to form a closed loop circuit and cause system noise problems. Effective methods to prevent the formation of closed loop loops include: (1) grounding one end of the shielding layer (usually at the signal input end) and opening the other end; (2) Distinguish between casing grounding points and signal grounding points.
4 Purification power supply
When designing the power supply, a separate power transformer should be designed; When there is no condition, a group of power supplies can be independent, separated from equipment such as air conditioners and lighting, or isolated power transformers can be used, or filters can be installed at the power input terminals of broadcast equipment to filter out noise.
5 System isolation
Radio stations often use telephone lines to transmit live audio broadcast signals. Since different subsystems have their own independent grounding systems, once the two systems are connected to the ground, grounding noise inevitably occurs. On the other hand, due to the interconnection of the two subsystems in the plane, even using single ended shield grounding and long line segmented grounding, there is no way to solve the radiation interference noise caused by long-distance transmission, especially when using a large telephone network for transmission. At this time, the best measure is to use an isolation method, and install an audio isolation transformer between the two systems to isolate them from each other.
6 Daily maintenance
Regularly check and test the background music function to ensure that the system functions can be used normally;
Regularly test the speaker circuit to ensure that the speaker circuit is in a normal state, effectively avoiding normal use in emergency situations;
Considering that electronic equipment is prone to malfunctions due to the impact of dust, etc., it is necessary to regularly clean the equipment during use. When cleaning dust, special tools should be used, and attention should be paid not to transfer dust into the equipment.
The final presentation effect of the public address system is related to equipment quality, installation, debugging, and later maintenance. In order to prevent noise and whistling, the above six points must be noted.

What should be paid attention to in conference sound reinforcement system

Introduction to the Composition and Characteristics of Wireless Conference System