Why does a small loudspeaker in class use harsh noises sometimes?
Because there is a current through the microphone, the speakers are also current through, if they put too close, will receive the current microphone loudspeaker, and louder (to some extent), put it away on the line, this is the result of mutual interference.
Generally because there are watches or mobile phones near the magnetic metal or electronic componentsJust sometimes closer to the electronic components, then there will be electromagnetic interference, interference frequency and the original frequency difference is too large, the sound will be very harshIt is better to put the electronic component away when it is suggested to use it
The signal generates positive feedback. In other words, the microphone is near the sound, the sound is introduced by the microphone, amplified by the sound, and then the sound amplified by the sound enters the microphone, so that the cycle is magnified indefinitely. This is so will have a piercing screech in a very short period of time.
This phenomenon is called self-excited oscillation.Self excitation whistling is a common problem in audio equipment and causes headaches for users. Not only annoying, damaging atmosphere, but also sometimes damage to equipment.The reason for self-excited whistling is that sound amplification takes time. The process is: sound by a microphone amplifier - - horn released by air once again spread to the microphone amplifier, so repeated circulation scream.The occurrence of self-excited oscillation is related to the conditions in the field and the performance of the amplifying equipment. If a cycle longer, most people feel a horn (acoustic echo phase); if the spread to the microphone sound of the horn is small, recycling will become increasingly weak to maintain (amplitude acoustic conditions). A howling occurs only when a particular condition (phase and amplitude) is satisfied.Prevent howling can take the following methods: 1, reduce the volume; 2, the low sensitivity of microphone (that must be close to the microphone to speak); 3, with strong directional microphone; 4, using the anti - interference microphone; 5, access attenuation equalizer, howling band; 6, access frequency shifter, broken ring howling phase; 7, closed sound, microphone and speakers will be placed in different rooms; 8, on the wall of the room to take 9, multi speaker acoustic treatment; small volume, each horn tube in a small area, the volume is very small; 10, using special self suppression equipment.Without changing the environment and the condition of the equipment, changing the position of the microphone and the speaker (wall reflection should be taken into account) to reduce the horn sound into the microphone, find the howling point to the sound amplification equipment does not occur.
It's a whistle. The speaker is near the receiver. It's better to put the loudspeaker behind you!
