Power interference, lighting system and audio system power supply can avoid the interference of the lighting system to the sound system, which was mentioned in the previous article.
2. When the lighting and sound system are grounded, do not use the ground wire of the power supply. Find a professional electrician to play two ground wires according to the standard of the lightning rod. One for the lighting system, you can connect to the light stand and the light console; one ground wire to the sound The system uses the star grounding method, which minimizes the interference of the light on the sound.
3. Of course, in addition to the interference of the lighting system, the power supply of the sound system itself has slight interference problems. For example, the power pulse generated when the power switch is turned on may cause a slight pulse sound in the sound system. When I used to operate the console with headphones in the middle of the night, I heard the radio broadcast in the console several times. Of course, these should be power interference.
Wireless signal interference 1. Wireless microphones Poor quality wireless microphones can interfere with the operation of other wireless microphones, and wireless microphone signals are also susceptible to interference from other wireless signals. Therefore, wireless microphones should pay special attention to these aspects of interference when using them.
2. Cell phone signal interference This kind of interference often occurs when the singer sings with a wireless microphone. At this time, if the singer’s mobile phone comes in, the mobile phone signal may interfere with the wireless microphone signal, causing a lot of noise in the sound system. In the regular performance, the actor is not allowed to bring a mobile phone to play.
3. Other interferences Some other wireless communication devices such as walkie-talkies, radio broadcasts, various wireless receiving and transmitting systems, and electromagnetic systems may interfere with the sound system.
Disc player interference Some inferior DVD or VCD players can easily interfere with the mixer through the signal line, resulting in more serious noise in the mixer. In short, the interference failure of the sound system is various, and the causes of the failure are also various. As long as it is an electronic device, there is no way to completely avoid such interference, and we can only avoid it as much as possible.
Interference failure case 1. An integrator made a large opera house. Although the lights and sounds were connected to the ground respectively, the noise in the sound system was still very obvious, and it was definitely impossible to pass the acceptance. Moreover, even if the mixer does not open, there is noise in the total volume. Unplug the 30 multi-channel signal input lines on the mixer one by one. When the 27 and 28 two-stage stage microphone lines were pulled out, the noise was found to be no longer. It is proved that these two lines are the source of noise. The original two lines are the stage. 2 spare microphone lines on the outside.
Analysis of the cause: The original frame of the stage is made of metal. The lighting system is connected to the stage frame through these metal, and the two microphone cases are fixed on the stage metal frame with metal screws, which is equal to the light. Interference is passed through the microphone box to the mixer.
Solution: Remove the microphone box screw and directly fix the microphone box with glass glue. The glass glue is insulated, so the fault is eliminated.
2. An international conference and exhibition center in a certain city. When the leader of the board just wanted to speak, the speaker suddenly made a thunderous noise, and the leader of the room was scared on the spot, and then he would not go away.
Analysis of the cause: The wireless microphone used on the podium was the day when the meeting was held. When the leader went to the top to speak, the lighting engineer lighted the podium lighting, and the sound engineer turned on the wireless microphone. Who knows the system? There was a lot of noise in the middle. The preliminary judgment should be caused by the mutual interference of the lighting system and the wireless microphone signal, so the exercise was performed many times according to the situation of the day, and the judgment was correct.
Solution: The engineer re-wired the two ground lines to the lighting system and the sound system respectively, and then used the power of the silicon box to control the other power supply on the podium. At the same time, the three-color color and other cold light source lamps for the conference were added. , then increase the number of wired conference microphones on the podium. Since then, many large-scale international conferences and large-scale performances have not experienced serious interference failures.
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