The most perfect and most professional video conferencing audio

Interference conference sound system and method for processing audio interference commonly interfere with the audio signals generated in the transmission process is multifaceted, a common power disturbances, interference between devices, lighting interference. 1, power disturbances. Power poor grounding, poor contact between the devices and ground impedance mismatch, power without the device's "purification" processing, audio cable and AC cord with the pipe, ditch, or with the same bridge laying, will be on the audio signal clutter to form a low-frequency AC "buzzing" sound. 2, interference between the devices. "Howling" occurs between the speaker and the microphone positive feedback caused mainly due to too close to the microphone away from the speakers or microphone to point speakers. "Empty sound" is produced by sound waves delay, if the microphone picked up both the sound source signal has a signal picked up by the PA to restore, or distance from the sound source with two different microphone picks up the signal with the sound source, or a microphone pickup After another public address microphone only after reduction signal will produce a corresponding path length difference caused by the delay. When these signals are superimposed, some frequency components cancel each other, forming a "empty sound." 3, light interference. If the venue started intermittently using ballast lighting, the lamp will be generated when the excitation frequency radiation, and its lead in series through a microphone, a "da da" sound; microphone cable from the lamp cord too close, there will be "creak" sound. Further, also the external high-frequency electromagnetic interference. Processing method of video conferencing sound reduction, should be based on theoretical knowledge of acoustics, according to the actual situation of different flexibility to adjust the mixer and equalizer, sound processing and landscaping, defects make up the sound field, creating an ideal acoustic environment; appropriate adjust the compression limiter encounter unexpected large peak signal overloading and distortion, while avoiding compression limiter for a long time in a compressed state, so that the sound of convergence smooth, mellow. For power interference, may take the following solutions: ① increase power filters, the use of a resonant circuit to filter harmonics, "clean" output power; ② signal input and output lines and power lines traces separately and can not be wired in parallel, to avoid Nearby and cross-interference, mutual induction; ③ the use of twisted power lines, bringing the total magnetic flux generated by two wires cancel each other out. For the "whistle" phenomenon, may take the following approach avoids the formation of the natural resonance points: ① reduce PA gain; ② the use of an equalizer or automatic feedback suppressor reduces the magnitude of "howling" frequency point; ③ connector or tone frequency shifter phase, with the offset frequency or phase to destroy the feedback sound and the sound source with phase conditions; ④ adjust the speaker layout, changing the distance between the microphone direction and avoid the formation of positive feedback. For the "empty sound" phenomenon, may take the following approach avoids acoustic delay: ① chosen a highly directional microphone; ② Close Mixer ST-switch or pull down the extra microphone fader; ③ adjust the sound source and by PA restore sound ratio. For light interference, can be taken to solve the following methods: ① microphone cord away from light line; ② shielded microphone cable through the tube; ③ the use of anti-interference ability of the microphone. In summary, we should do a better job of video conferencing, it is necessary to improve the sound aesthetic appreciation and artistic accomplishment, and sound reduction conceived and creativity, artistic expression in order to improve the sound.