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The Turner Microphone company was founded by David Turner and Everett Foster in Cedar Rapids, Iowa in 1931. The company soon began making microphones and public address systems . Turner opened a larger factory in 1936 and produced a large quantity of microphones and grew to 1200 employees by the 1970s.
A wireless microphone, or cordless microphone, is a microphone without a physical cable connecting it directly to the sound recording or amplifying equipment with which it is associated. Also known as a radio microphone , it has a small, battery-powered radio transmitter in the microphone body, which transmits the audio signal from the ...
A theatrical hair and wig designer works with the theatre director and costume designer to create appropriate looks that define each performer in a theatre production. . This includes becoming familiar with the script, meeting with the director and costumer, conducting any research that may be required, and developing designs for each performer while working within the
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Carbon microphone from Western Electric telephone handset, around 1976. A disassembled Ericsson carbon microphone with carbon particles visible. The carbon microphone, also known as carbon button microphone, button microphone, or carbon transmitter, is a type of microphone, a transducer that converts sound to an electrical audio signal.
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On 25 August 2009, U.S. patent 7,580,533 was issued for a device that uses a laser beam and smoke or vapor to detect sound vibrations in free air ("Particulate Flow Detection Microphone based on a laser-photocell pair with a moving stream of smoke or vapor in the laser beam's path"). Sound pressure waves cause disturbances in the smoke that in ...
An electret microphone is a microphone whose diaphragm forms a capacitor (historically-termed a condenser) that incorporates an electret. The electret's permanent electric dipole provides a constant charge Q on the capacitor.
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