When working with microphones, the user often has to deal with various kinds of interference. Such interference can only be eliminated if the cause of its occurrence is known.
Instructions
Step 1
Determine the cause of the interference by its nature. Intense hiss when recording outdoors may be caused by wind blowing on the microphone. Any kind of crackling that occurs when the microphone is moved occurs when the wires are broken and short-circuited. The presence in the signal, in addition to the voice, of extraneous noises (noise of cars, voices of people who are far from the microphone), indicates an incorrectly selected directional pattern. Finally, the hum, the frequency of which depends on the distance between the microphone and the speakers, is a consequence of acoustic feedback.
Step 2
To protect the microphone from the wind, use a special cap, which is called a windproof cap. It may be included in the delivery set of the device, and if it is not there, just wrap it with several layers of foam rubber with a total thickness of about 10 millimeters.
Step 3
If there is a cracking sound, try to find out which section of the cable is bent. There is a periodically occurring short circuit or open circuit. Eliminate it.
Step 4
In order for the microphone to be sensitive only to the speaker's voice, and not to extraneous noise, change it to another one with a narrow directivity pattern. Differential microphones DEM and DEMSh, which are insensitive to sounds equally affecting the membrane from both sides, give good results. In a particularly noisy environment, use the throatophone with the microphone.
Step 5
You can also use a differential microphone or throatophone to eliminate acoustic feedback. But they are rarely electret, which means that such a solution is unsuitable for working in conjunction with a computer. In this case, good results can be obtained from a piezoelectric laryngophone, which develops voltages of sufficient amplitude. It must necessarily be well electrically insulated from the neck. If using a conventional microphone, try lowering the volume of the speakers or placing the unit farther from them. Finally, a radical solution is to use headphones instead of speakers while recording or performing karaoke.
