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2. Talkboy - Wikipedia

   en.wikipedia.org/wiki/Talkboy

   Talkboy is a line of handheld voice recorder and sound novelty toys manufactured by Tiger Electronics in the 1990s. [1] The brand began as a result of a promotional tie-in with the 1992 film Home Alone 2: Lost in New York; the most well-known product was the Deluxe Talkboy, a cassette recorder and player with a variable-speed voice changer that caused toy crazes over several holiday shopping ...

3. Cam (bootleg) - Wikipedia

   en.wikipedia.org/wiki/Cam_(bootleg)

   Cams produced in this way use the camera's microphone to record audio, which tends to produce a recording that sounds "muddy". In addition, the microphone may pick up ambient noises in the auditorium, such as the audience's response to the film (e.g. laughter, screaming) or disruptive noises (crying baby, mobile phone ring, people coughing, etc.).

4. Covert listening device - Wikipedia

   en.wikipedia.org/wiki/Covert_listening_device

   The recording device was concealed on a person Thatcher had previously approached for help in the crime. [citation needed] Electronic bugging devices were found in March 2003 at offices used by French and German delegations at the European Union headquarters in Brussels. Devices were also discovered at offices used by other delegations.

5. The Thing (listening device) - Wikipedia

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

   The device, a passive cavity resonator, became active only when a radio signal of the correct frequency was sent to the device from an external transmitter. This is referred to in NSA parlance as "illuminating" a passive device. Sound waves (from voices inside the ambassador's office) passed through the thin wood case, striking the membrane and ...

6. DTS, Inc. - Wikipedia

   en.wikipedia.org/wiki/DTS,_Inc.

   DTS, Inc. (originally Digital Theater Systems) is an American company.DTS company makes multichannel audio technologies for film and video.Based in Calabasas, California, the company introduced its DTS technology in 1993 as a competitor to Dolby Laboratories, incorporating DTS in the film Jurassic Park (1993).

7. RCA Photophone - Wikipedia

   en.wikipedia.org/wiki/RCA_Photophone

   Unlike the Phonofilm and Movietone systems in which the audio modulated the intensity of a recording lamp which exposed the soundtrack, thus creating a variable-density track, the GE system employed a fast-acting mirror galvanometer to create a variable-area soundtrack. A number of demonstrations of this system, now known as Photophone, were ...