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2. TV Ears - Wikipedia

   en.wikipedia.org/wiki/Tv_ears

   The 5.0 Dual Digital wireless TV listening system, is the most powerful of the TV Ears’ headsets, containing twice the number of light emitting diodes. The system operates off of a digital connectivity via an optical digital audio cord and is compatible with Dolby Digital, SRS, and PCM ensuring that it works successfully with any television ...

3. The Thing (listening device) - Wikipedia

   en.wikipedia.org/wiki/The_Thing_(listening_device)

   The Thing (listening device) The Thing, also known as the Great Seal bug, was one of the first covert listening devices (or "bugs") to use passive techniques to transmit an audio signal. It was concealed inside a gift given by the Soviet Union to W. Averell Harriman, the United States Ambassador to the Soviet Union, on August 4, 1945.

4. History of radio - Wikipedia

   en.wikipedia.org/wiki/History_of_radio

   History of radio. The early history of radio is the history of technology that produces and uses radio instruments that use radio waves. Within the timeline of radio, many people contributed theory and inventions in what became radio. Radio development began as "wireless telegraphy". Later radio history increasingly involves matters of ...

5. Assistive listening device - Wikipedia

   en.wikipedia.org/wiki/Assistive_Listening_Device

   The assistive listening device usually uses a microphone to capture an audio source near its origin and broadcast it wirelessly through means of frequency modulation (FM), infrared (IR), an audio induction loop, or another method. The person who is listening may use a wireless Receiver to tune into the signal and listen at their preferred volume.

6. High fidelity - Wikipedia

   en.wikipedia.org/wiki/High_fidelity

   High fidelity (often shortened to Hi-Fi or HiFi) is the high-quality reproduction of sound. [ 1] It is popular with audiophiles and home audio enthusiasts. Ideally, high-fidelity equipment has inaudible noise and distortion, and a flat (neutral, uncolored) frequency response within the human hearing range. [ 2]

7. Instructing Educators in the Use of Assistive Technology ...

   files.eric.ed.gov/fulltext/EJ1069275.pdf

   Students with hearing impairments will need a kind of assistive technology device like a hearing aid to assist in hearing. Media can help them and language skills will be easily developed by students when using assistive technology devices. C. Problem • Limitations of assistive technology, like the FM amplification device and hearing aids

8. Broadcast signal intrusion - Wikipedia

   en.wikipedia.org/wiki/Broadcast_signal_intrusion

   A broadcast signal intrusion is the hijacking of broadcast signals of radio, television stations, cable television broadcast feeds or satellite signals without permission or licence. Hijacking incidents have involved local TV and radio stations as well as cable and national networks. Although television, cable, and satellite broadcast signal ...

9. ERIC - ED509284 - The Role of Assistive Listening Devices in ...

   eric.ed.gov/?id=ED509284

   ALDs utilize different technologies. Typically, they are wireless or wired. Wireless ALDs make use of radio frequencies, light rays, or magnetic inductive energy to transmit sound. Hardwired ones use direct electrical connection to transmit the auditory signal. Each system has special features, capabilities, advantages, and disadvantages.