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mems microphone ppt
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Microphone, microphone or microphone in common parlance(/maɪk/),  an acoustic to electric transducer or sensor that converts sound into an electrical signal in the air. Microphonesare used in many applications such as cell phones, hearing aids,warning systems for concert halls and public events, film images,live and recorded audio equipment, radios, megaphones, radioand television broadcasting and in computers for recordingvoice, VoIP, speech recognition, and for non-acoustic purposes such as ultrasonic checking or knock sensors.


Most microphones today uses electromagnetic induction(dynamic microphones), changing the capacity (condenser microphones) or piezoelectricity (piezoelectric microphones) for the electrical signal from the fluctuations in the air pressure.Microphones typically must be connected with the pre-amplifier,before the signal can be amplified with the power amplifier oraudio recorded.
History
In order to speak to large groups of people, there was a desire to increase the volume of the spoken word. Earliest knowndevice for this purpose dates back to 600 BC with the invention of the masks with specially designed holes mouth thatacoustically advanced voice in amphitheaters. In 1665, theEnglish physicist Robert Hooke was the first to experiment withmedia other than air, with the invention of "love call" from astretched wire with the Cup is attached at each end.

German inventor Johann Philipp Reis is a young soundtransmitter, which uses the metal strip attached to a vibratingmembrane, which will produce a periodic current. The bestresults were achieved with a "liquid transmitter design in telephone Scottish-American 1876 Alexander Graham Bell-diaphragm was attached to conducting rod in an acid solution.These systems, however, gave a very poor sound quality.
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