The public address system is noisy because you ignore these 6 points

The public broadcasting system is currently a system that is in demand in all walks of life, and will be used in hotels, shopping malls, parks, attractions and other places.

In actual use, we will find that some broadcasting systems are electro-acoustic and natural and smooth, but some have some noise and howling. How can we deal with this situation?

1.Purchasing good quality broadcast equipment

The system broadcast equipment selects products with good performance indicators and strong anti-interference ability. The anti-interference ability of broadcasting equipment is determined by the noise suppression ability, which is restricted by the broadcasting equipment's circuit, manufacturing process and materials used.

Therefore, if the budget allows and you want better results, it is recommended to buy higher-end broadcast equipment, and pay for everything, the same principle forever.

2. Connect the signal cables between the devices correctly

The quality of the equipment is too high. Pay attention to the connection between the signal lines of the equipment. If connected incorrectly or improperly, even good-performing equipment will struggle to achieve its outstanding quality.

Grounding is an important technical measure to suppress noise, prevent interference, and improve reliability. Proper grounding can suppress the impact of interference on the system, and can also suppress the external radiation interference of broadcasting equipment; on the contrary, incorrect grounding can introduce serious interference and even make broadcasting equipment unable to work normally.

All power cables and signal cables are protected by metal pipes, which can play a certain shielding role.

3. Do not solder shielded wires at will

During the installation of equipment in the computer room, do not solder the shielded wires conveniently and easily. Otherwise, a closed-loop circuit is likely to be formed, causing 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; (2) the ground points of the chassis ground and signal ground are distinguished.

4, purification power

When designing the power supply, a separate power transformer should be designed; when unconditional, a separate set of power supply can be used to separate it from air conditioning, lighting and other equipment, or an isolated power transformer, or a filter at the power input end of the broadcast equipment to reduce noise Strain it out.

5, system isolation

Radio stations often use telephone lines to transmit live audio broadcast signals. Because different subsystems have separate grounding systems, once the two systems are connected to the ground wire, ground noise will inevitably be formed.

On the other hand, after the two subsystems in the plane are interconnected, even if single-ended shielded grounding and long-line segmented grounding are used, there is no way to solve the radiation interference noise caused by long-distance transmission, especially when transmitting with a large telephone network. At this time, a good measure is to adopt 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;

Test the speaker circuit regularly to ensure that the speaker circuit is in a normal state and effectively avoid normal use in emergencies;

Considering that electronic equipment is susceptible to failure due to the effects of dust, etc., during the use of the device, it needs to be cleaned regularly. Special tools are required to clean up the dust, and be careful not to put dust into the device.

The final presentation effect of the public broadcasting system is related to equipment quality, installation and commissioning, and subsequent maintenance. In order to prevent noise and howling, the above 6 points must be paid attention to.