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The electret microphone is based on the electret capacitor, which is a special capacitor with quasi-permanent charge. Vibrations in the air are picked up by the capacitor, which generates an equivalent vibrating electrical signal. Unlike a traditional condensor (another name for capacitor) microphone, the electret does not require a power source.
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Who invented the condenser microphone?
E.C. Went
What converts sound waves to an electrical signal?
Microphone can do this job.
How does microphone mixer work?
To combine the signals of multiple microphones, you add (sum) their electrical voltages, just like the sound waves from multiple singers sum in the air. To measure the voltage produced by the microphone without affecting it, you need amplifier circuits with high input impedances. These amplifiers must also have a widely variable gain (trim control), since there are many different microphones with different output levels, and you want them all internally at the same level. Then you might have EQ or other controls to manipulate the sound of each microphone. Then there is an overall volume control for each microphone, for setting the relative level of each. Then the weighted signals go into a summing amplifier to be added together, and then to an output.
Microphone gives dc or ac output?
Microphone gives ac output. Microphone converts sound energy to electrical energy. Due to vibration of Carbon diaphragm the resistance varies so that the amplitude of current varies. That is not entirely true. A microphone element produces a very small DC sine wave output, all of it above the zero line. It can be made to have an AC ouput if a circuit is added to do so, as an amplifier which provides the negative component. Thus, half (or sometimes less than half) of the sine wave will be below the zero line. Otherwise, circuitry may be integral to the mic. Example: http://www.rane.com/pdf/old/mic1dat.pdf ( See the Phasing spec )
What is a roll off filter of a microphone?
The roll off filter removes low frequencies. Usually at about 75 HZ and bellow.
