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The transmitter was strapped to the umpire's back. Herbert "Mac" McClelland, founder of McClelland Sound in Wichita, Kansas, fabricated a wireless microphone to be worn by baseball umpires at major league games broadcast by NBC from Lawrence–Dumont Stadium in 1951. In 1972 Moores donated his 1947 prototype to the Science Museum in London.
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The producers of the ice show decided that they would not continue using the device they would rather hire actors and singers to perform into hidden microphones to "dub" the voices of the other ice skaters, who would thus be free to concentrate on their skating. Moores did not patent his idea, as he was illegally using the radio frequency 76 MHz. Moores affixed the wireless transmitter to the costume of the character Abanazar, and it worked perfectly. įigure skater and Royal Air Force flight engineer Reg Moores developed a radio microphone in 1947 that he first used in the Tom Arnold production "Aladdin on Ice" at Brighton's sports stadium from September 1949 through the Christmas season.
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Various individuals and organizations claim to be the inventors of the wireless microphone.įrom about 1945 there were schematics and hobbyist kits offered in Popular Science and Popular Mechanics for making a wireless microphone that would transmit the voice to a nearby radio. A few low cost (or specialist) models use infrared light, although these require a direct line of sight between microphone and receiver. Some models use antenna diversity (two antennas) to prevent nulls from interrupting transmission as the performer moves around. FM modulation is usually used, although some models use digital modulation to prevent unauthorized reception by scanner radio receivers these operate in the 900 MHz, 2.4 GHz or 6 GHz ISM bands.
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Cheap units use a fixed frequency but most units allow a choice of several frequency channels, in case of interference on a channel or to allow the use of multiple microphones at the same time. Wireless microphones usually use the VHF or UHF frequency bands since they allow the transmitter to use a small unobtrusive antenna. Wireless microphones are widely used in the entertainment industry, television broadcasting, and public speaking to allow public speakers, interviewers, performers, and entertainers to move about freely while using a microphone without requiring a cable attached to the microphone. Most bodypack designs also support a wired instrument connection (e.g., to a guitar). The bodypack is connected by wire to a "lavalier microphone" or "lav" (a small microphone clipped to the user's lapel), a headset or earset microphone, or another wired microphone. In another type the transmitter is contained within a separate unit called a "bodypack", usually clipped to the user's belt or concealed under their clothes. In one type the transmitter is contained within the handheld microphone body. The other audio equipment is connected to the receiver unit by cable. 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 microphone by radio waves to a nearby receiver unit, which recovers the audio.