Technical analysis: audio problems in the conference system and attention to details

Looking at the audio problems of today's video conferencing systems, the main manifestations are large noise, local sound howling, sound scale imbalance, light interference, power interference and other issues. This article discusses related sound effects and puts forward different attention to details. Conference system audio problems and attention to details Common audio problems in conference systems: 1. Loud noise. It affects the clarity, softness, and brightness of the sound. In severe cases, it will cover up the sound of the venue. Due to excessive gain, automatic gain control, impedance mismatch, etc., background noise will appear. 2. The local voice howls. The principle is that the sound of the speaker is fed to the microphone, so that a positive feedback circuit is formed between the speaker and the microphone, which is mainly caused by the unreasonable placement of the microphone and the speaker in the layout of the conference room. 3. The sound is out of proportion. If the sound ratio between the main control room, the main conference room, and the speaking branch venue is out of balance, it will affect the balance of the remote sound restoration of other branch venues, and cause the overall effect of the conference to decrease. 4. Light interference. If the ballast is used in the venue for intermittently activated lighting, high-frequency radiation will be generated when the lamp is excited, and it will be stringed in through the microphone and its lead, and there will be a 'click'; the microphone line will also appear if it is too close to the light line 'Squeak' sound. 5. Power interference. Poor grounding of the power supply, poor grounding contact and impedance mismatch between the equipment, and the power supply of the equipment without 'purification' treatment, etc., will cause clutter interference to the audio signal, forming a low-frequency AC 'buzzing' sound. Tuning skills for video conferences 1. Do not use the built-in microphone and speakers of the notebook. 2. The distance between the speaker and the microphone should be farther away. 3. The conference room should choose unidirectional dynamic microphone or wireless microphone. 4. The audio performance of the operating system win7 is better than xp. 5. PCs with too low performance will bring noise. 6. Use a mixer or mic amplifier to increase the volume of the dynamic microphone.