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  2. Laser microphone - Wikipedia

    en.wikipedia.org/wiki/Laser_microphone

    On 25 August 2009, U.S. patent 7,580,533 was issued for a device that uses a laser beam and smoke or vapor to detect sound vibrations in free air ("Particulate Flow Detection Microphone based on a laser-photocell pair with a moving stream of smoke or vapor in the laser beam's path"). Sound pressure waves cause disturbances in the smoke that in ...

  3. Microphone - Wikipedia

    en.wikipedia.org/wiki/Microphone

    A new type of laser microphone is a device that uses a laser beam and smoke or vapor to detect sound vibrations in free air. On August 25, 2009, U.S. patent 7,580,533 issued for a Particulate Flow Detection Microphone based on a laser-photocell pair with a moving stream of smoke or vapor in the laser beam's path.

  4. Covert listening device - Wikipedia

    en.wikipedia.org/wiki/Covert_listening_device

    A laser microphone can be used to reconstruct audio from a laser beam shot onto an object in a room, or the glass pane of a window. Researchers have also prototyped a method for reconstructing audio from video of thin objects that can pick up sound vibrations, such as a houseplant or bag of potato chips. [18]

  5. Long-range optical communication - Wikipedia

    en.wikipedia.org/wiki/Long-range_optical...

    Long-range optical communication or free-space optical communication (FSO) is an optical communication technology that uses light propagating in free space to wirelessly transmit data for telecommunications or computer networking over long distances. "Free space" means air, outer space, vacuum, or something similar.

  6. Sennheiser MD 441 - Wikipedia

    en.wikipedia.org/wiki/Sennheiser_MD_441

    Sennheiser MD 441. The Sennheiser MD 441 is a large-diaphragm dynamic microphone introduced by Sennheiser in 1971. [1] Following the introduction of the MD 21 in 1953 and the Sennheiser MD 421 in 1960, the MD 441 was widely-used for radio and television reporting and was often seen as part of political appearances around the world.

  7. The 30 Best 'Cool' Gifts for Teens in 2022

    www.aol.com/lifestyle/best-gifts-for-teens...

    Not only does the Rukus FX mix music, it has an LED light show and over 80 sound effects. And of course, there's a built-in microphone for vocals.

  8. Category:Microphones - Wikipedia

    en.wikipedia.org/wiki/Category:Microphones

    Pages in category "Microphones" The following 34 pages are in this category, out of 34 total. ... Laser microphone; Lavalier microphone; M. Magic Mic;

  9. The Thing (listening device) - Wikipedia

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

    The cavity was a high-Q round silver-plated copper "can", with the internal diameter of 31 ⁄ 40 in (19.7 mm) and about 11 ⁄ 16 in (17.5 mm) long, with inductance of about 10 nanohenries. [5] Its front side was closed with a very thin (3 thou , or 75 micrometers) and fragile conductive membrane.

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