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  2. Ray J - Wikipedia

    en.wikipedia.org/wiki/Ray_J

    Ray J. William Ray Norwood Jr. (born January 17, 1981), [1] known professionally as Ray J, is an American R&B singer, songwriter, television personality, and actor. Born in McComb, Mississippi, and raised in Carson, California, he is the younger brother of singer and actress Brandy Norwood. [3] In January 2017, he competed in the nineteenth ...

  3. Noise-cancelling headphones - Wikipedia

    en.wikipedia.org/wiki/Noise-cancelling_headphones

    Noise-cancelling headphones alongside a carry case. Noise-cancelling headphones are headphones which suppress unwanted ambient sounds using active noise control. This is distinct from passive headphones which, if they reduce ambient sounds at all, use techniques such as soundproofing.

  4. List of amateur radio modes - Wikipedia

    en.wikipedia.org/wiki/List_of_amateur_radio_modes

    Amateur teleprinting over radio (AMTOR) D-STAR (Digital Data) a high speed (128 kbit/s), data-only mode. Hellschreiber, also referred to as either Feld-Hell, or Hell a facsimile-based teleprinter. Discrete multi-tone modulation modes such as Multi Tone 63 (MT63) Multiple frequency-shift keying (MFSK) modes such as. FSK441, JT6M, JT65, and FT8.

  5. Active noise control - Wikipedia

    en.wikipedia.org/wiki/Active_noise_control

    Noise control is an active or passive means of reducing sound emissions, often for personal comfort, environmental considerations, or legal compliance. Active noise control is sound reduction using a power source. Passive noise control is sound reduction by noise-isolating materials such as insulation, sound-absorbing tiles, or a muffler rather ...

  6. Hearables - Wikipedia

    en.wikipedia.org/wiki/Hearables

    Speakers, to convert analog signals to sound. Bluetooth IC, to communicate with other devices typically a smartphone. Sensors, to track heart rate, cadence, or to detect proximity. Microphones, to take or make phone calls, or take voice commands. Most of the "Hearables" seen to date are Bluetooth devices that use phones or PCs as the central ...

  7. Headphones - Wikipedia

    en.wikipedia.org/wiki/Headphones

    Wireless headphones. Headphones are a pair of small loudspeaker drivers worn on or around the head over a user's ears. They are electroacoustic transducers, which convert an electrical signal to a corresponding sound. Headphones let a single user listen to an audio source privately, in contrast to a loudspeaker, which emits sound into the open ...

  8. Spatial hearing loss - Wikipedia

    en.wikipedia.org/wiki/Spatial_hearing_loss

    Spatial hearing loss. Spatial hearing loss refers to a form of deafness that is an inability to use spatial cues about where a sound originates from in space. Poor sound localization in turn affects the ability to understand speech in the presence of background noise. [1]

  9. Radar beacon - Wikipedia

    en.wikipedia.org/wiki/Radar_beacon

    Radar beacon (short: racon) is – according to article 1.103 of the International Telecommunication Union's (ITU) ITU Radio Regulations (RR) [1] – defined as "A transmitter-receiver associated with a fixed navigational mark which, when triggered by a radar, automatically returns a distinctive signal which can appear on the display of the ...

  10. MGM-140 ATACMS - Wikipedia

    en.wikipedia.org/wiki/MGM-140_ATACMS

    History Demonstration of firing. The concept of a conventional tactical ballistic missile was made possible by the doctrinal shift of the late Cold War, which rejected the indispensability of an early nuclear strike on the Warsaw Pact forces in the event the Cold War went hot.

  11. High-frequency Active Auroral Research Program - Wikipedia

    en.wikipedia.org/wiki/High-frequency_Active...

    The High-frequency Active Auroral Research Program ( HAARP) is a University of Alaska Fairbanks program which researches the ionosphere – the highest, ionized part of Earth's atmosphere . The most prominent instrument at HAARP is the Ionospheric Research Instrument (IRI), a high-power radio frequency transmitter facility operating in the high ...