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It consisted of a microphone in one location and a remote listening post with a speaker that could also be recorded using a phonograph. While also marketed as a device that allowed broadcasting of sounds, or dictating text from one room to a typist in another, it was used in several criminal investigations. [8] [9]
A receiver demodulated the signal so that sound picked up by the microphone could be heard, just as an ordinary radio receiver demodulates radio signals and outputs sound. Its design made the listening device very difficult to detect, because it was very small, had no power supply or active electronic components, and did not radiate any signal ...
The allocated time slot on the wiring out of the concentrator (with the same time slot number) carries data from the local microphone to the remote speaker. To arrange a connection, the switch just completes the circle between the user's phone and the remote phone. It interchanges the data from one to the other.
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The Candid Microphone is an American radio program that was broadcast on ABC from June 28, 1947, until September 23, 1948, and on CBS from June 6, 1950, until August 29, 1950. It was adapted for television as Candid Camera . [ 1 ]
Covert listening devices or "bugs", tiny, hidden microphone and short-range radio transmitter; directional microphones; primarily chemical Artificial noses; Chemical markers like UV markers; DNA sensors: Biochip etc., for screening tiniest traces of body material; Other Airplanes, unmanned aerial vehicles and satellites; Night-vision goggles or ...
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 ...
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