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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.
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 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 term referred to any small microphone that could be hooked into the buttonhole of the lapel of a coat. The lapel microphone offered freedom of movement. [2] An early use of the microphone supported by a strap around the neck: telephone operator. The term lavalier originally referred to jewelry in the form of a pendant worn around the neck ...
The receiver records the Morse code on paper tape Generic block diagram of an unamplified radio receiver from the wireless telegraphy era [25] Example of transatlantic radiotelegraph message recorded on paper tape by a siphon recorder at RCA's New York receiving center in 1920. The translation of the Morse code is given below the tape.
Receiver in canal (RIC) hearing aids are similar to BTE styles but offer a more discreet option. This type of hearing aid is worn behind the ear with the speaker inside the ear canal.
The lavalier cord may be hidden by clothes and either run to an RF transmitter in a pocket or clipped to a belt (for mobile use), or run directly to the mixer (for stationary applications). A wireless microphone transmits the audio as a radio or optical signal rather than via a
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