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  2. Astro (Motorola) - Wikipedia

    en.wikipedia.org/wiki/Astro_(Motorola)

    ASTRO 25 solutions are designed for information assurance by preventing, detecting, and responding to external and internal risks. [25] On January 19, 1996, Motorola was the first U.S. company to be granted FIPS 140-1 validation for its ASTRO subscriber encryption module, having been granted certificate number 2.

  3. Motorboating (electronics) - Wikipedia

    en.wikipedia.org/wiki/Motorboating_(electronics)

    In electronics, motorboating is a type of low frequency parasitic oscillation (unwanted cyclic variation of the output voltage) that sometimes occurs in audio and radio equipment and often manifests itself as a sound similar to an idling motorboat engine, a "put-put-put", in audio output from speakers or earphones.

  4. Project 25 - Wikipedia

    en.wikipedia.org/wiki/Project_25

    Several hand-held Project 25 radios used around the world. Project 25 (P25 or APCO-25) is a suite of standards for interoperable digital two-way radio products. P25 was developed by public safety professionals in North America and has gained acceptance for public safety, security, public service, and commercial applications worldwide. [1]

  5. Electret microphone - Wikipedia

    en.wikipedia.org/wiki/Electret_microphone

    An electret film is applied to the back plate of the microphone capsule and the diaphragm is made of an uncharged material, which may be mechanically more suitable for the transducer design being realized. Front electret This design features no back plate, and the capacitor is formed by the diaphragm and the inside surface of the capsule.

  6. Trump fumes over mic issues at Milwaukee rally: ‘Do ... - AOL

    www.aol.com/trump-fumes-over-mic-issues...

    Former President Trump’s rally in Milwaukee on Friday was derailed by technical difficulties as he seethed over microphone issues during his final planned stop in the swing state of Wisconsin.

  7. Microphone - Wikipedia

    en.wikipedia.org/wiki/Microphone

    A microphone, colloquially called a mic (/ m aɪ k /), [1] or mike, [a] is a transducer that converts sound into an electrical signal. Microphones are used in many applications such as telephones , hearing aids , public address systems for concert halls and public events, motion picture production, live and recorded audio engineering , sound ...

  8. Audio feedback - Wikipedia

    en.wikipedia.org/wiki/Audio_feedback

    Block diagram of the signal-flow for a common feedback loop [1]: 118 . Audio feedback (also known as acoustic feedback, simply as feedback) is a positive feedback situation that may occur when an acoustic path exists between an audio output (for example, a loudspeaker) and its audio input (for example, a microphone or guitar pickup).

  9. ORTF stereo technique - Wikipedia

    en.wikipedia.org/wiki/ORTF_stereo_technique

    ORTF setup. The ORTF stereo technique, also known as side-other-side, is a microphone technique used to record stereo sound.It was devised around 1960 at the now-defunct Office de Radiodiffusion Télévision Française (ORTF).