Is the audio debugging in the conference room noisy? These three methods can be solved quickly!

　　Whether in schools or companies, meeting rooms will have multimedia equipment, including audio. During a meeting, no one wants to make noise during the meeting. Generally speaking, there must be an amplifier in the meeting audio, so noise is inevitable.

　　1. External noise

　　When debugging the audio in the conference room, various interference noises often affect the audio effect, resulting in poor audio effect. To deal with the noise, we need to know the source of the noise so as to cure it.

　　When the conference room was initially built, most of the external noise can be basically solved, and sound insulation treatment is enough, while the heat dissipation noise of the equipment needs to be treated later. First, high-quality silent heat dissipation fans should be selected, followed by sound absorption treatment around the equipment, and finally, the equipment should be installed in the corner as far as possible.

　　2. Background noise

　　After the equipment is turned on, the speaker makes a sound. Under normal circumstances, these noises can only be heard when you are close to the speaker, which will not affect the sound effect of the meeting room. One is product quality, the other is level mismatch during debugging. It can be checked step by step. First turn on the rear equipment to listen to the noise, and then turn on the front equipment in turn. If the noise of a certain equipment suddenly increases, the equipment has quality problems, and you can replace the equipment. If the rear equipment makes a lot of noise, but the noise changes little, then the rear equipment has a quality problem, and you can replace the equipment. If the rear equipment is turned on and the noise gradually increases, it is a problem of level mismatch, and the input level needs to be adjusted. For example, the input signal of the mixer is too small. In order to hear the normal signal, the power amplifier improves the output, and the noise increases significantly. If the input signal is normal, the noise amplification factor is small, and the noise is naturally small.

　　3. Current noise

　　When the computer is plugged into the desk or ground to play sound, there will be a stinging current sound; When the computer is not connected to the projection, it makes a normal noise. When the projection is connected, there is a buzzing current sound; When the computer is not connected to the power supply, it makes a normal noise. When the computer is connected to the power supply, there is a buzzing current sound; In these three cases, basically, the equipment is not grounded together, resulting in potential difference between the equipment, and entering the audio system to amplify the noise through the unbalanced audio cable; If all grounding is still unacceptable, and everything else is normal, and the wiring cannot be moved, buy a noise canceller; If it still fails, you need to change the wiring.

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