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In the UK, use of wireless microphone systems requires a Wireless Telegraphy Act license, except for the license free bands of 173.8–175.0 MHz and 863–865 MHz. In 2013 the UK communications regulator, Ofcom, held an auction in which the UHF band from 790 MHz to 862 MHz was sold to be used for mobile broadband services. [23] [24] [25]
Raymond A. Litke (1920-1986) was an American electronic engineer, the inventor of a practical wireless microphone, and the first to patent the wireless microphone.He was born and raised on a farm near Alma, Kansas, but spent most of his adult life in San Jose, California.
Loop up-link (ground to train) systems Annex 5. Road transport and traffic telematics (RTTT) 5795–5805 MHz 5805-5815 MHz: C: 63–64 GHz: V: Vehicle to vehicle and road to vehicle systems 76–77 GHz: W: Vehicle radar and infrastructure radar systems 21.65–26.65 GHz: K: Automotive short range radars (SRR) (marketed until July 2013) 77–81 ...
MIPRO Electronics Co., Ltd. (Chinese: 嘉強電子), established in 1995, is an ISO-9001 certified Taiwan-based company that designs and manufactures wireless microphones, portable wireless public address and other wireless audio equipment for consumer, professional and commercial applications.
Microphonics, microphony, or microphonism [1] [2] [3] describes the phenomenon wherein certain components in electronic devices transform mechanical vibrations into an undesired electrical signal . The term comes from analogy with a microphone , which is intentionally designed to convert vibrations to electrical signals.
Listening devices of the East German security services A microphone disguised as a power outlet plate. A covert listening device, more commonly known as a bug or a wire, is usually a combination of a miniature radio transmitter with a microphone.
Shure Brothers microphone, model 55S, multi-impedance "Small Unidyne" dynamic from 1951. A microphone, colloquially called a mic (/ m aɪ k /), [1] or mike, [a] is a transducer that converts sound into an electrical signal.
By placing the diaphragm of the microphone capsule parallel to and facing the plate boundary provided by the microphone package, the reflected sound delay is reduced, and the resulting comb filter interference frequencies are high enough that they are outside the audible range. The terms "boundary microphone" and "pressure zone microphone" (or ...
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