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A microphone (or a mic or mike) is an acoustic-to-electric transducer or sensor that converts sound into an electrical signal. Microphones are used in many applications such as telephones, tape recorders, karaoke systems, hearing aids and in computers for recording voice, speech recognition, VoIP, and for non-acoustic purposes such as ultrasonic checking.
Most microphones today use electromagnetic induction (dynamic microphone), capacitance change (condenser microphone), piezoelectric generation, or light modulation to produce an electrical voltage signal from mechanical vibration.
The sensitive transducer element of a microphone is called its element or capsule. A complete microphone also includes a housing, some means of bringing the signal from the element to other equipment, and often an electronic circuit to adapt the output of the capsule to the equipment being driven. A wireless microphone contains a radio transmitter.
The most common connectors used by microphones are 3.5 mm (sometimes referred to as 1/8 inch mini) stereo (wired as mono) mini phone plug on very inexpensive and computer microphones.
Usage
Computer mic is plugged into the sound in or input RCA jack on the sound card. OS utility software like sound recorder and specialized sound recording software for recording sound using it.
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