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  2. Turtle Beach Corporation - Wikipedia

    en.wikipedia.org/wiki/Turtle_Beach_Corporation

    Turtle Beach also released the Stream Mic for users who broadcast from their consoles and PC. [33] In 2017, it released the first headsets (the Stealth 600 and 700) that could connect directly to the Xbox One console wirelessly. [34] The Stealth 600 went on to be the best-selling Xbox One gaming headset for 2018. [35]

  3. Continuous Tone-Coded Squelch System - Wikipedia

    en.wikipedia.org/wiki/Continuous_Tone-Coded...

    The most common set of supported tones is a set of 39 tones including all tones with Motorola PL codes, except for the tones 8Z, 9Z, and 0Z (zero-Z). [6] The lowest series has adjacent tones that are roughly in the harmonic ratio of 2 0.05 to 1 (≈1.035265), while the other two series have adjacent tones roughly in the ratio of 10 0.015 to 1 ...

  4. Roland GS - Wikipedia

    en.wikipedia.org/wiki/Roland_GS

    Roland GS, or just GS, sometimes expanded as General Standard [1] [2] or General Sound, [1] is a MIDI specification. It requires that all GS-compatible equipment must meet a certain set of features and it documents interpretations of some MIDI commands and bytes sequences, thus defining instrument tones, controllers for sound effects, etc.

  5. United States Army Field Manuals - Wikipedia

    en.wikipedia.org/wiki/United_States_Army_Field...

    According to The New York Times, the Army has started to "wikify" certain field manuals, allowing any authorized user to update the manuals. [4] This process, specifically using the MediaWiki arm of the military's professional networking application, milSuite, was recognized by the White House as an Open Government Initiative in 2010.

  6. Piano key frequencies - Wikipedia

    en.wikipedia.org/wiki/Piano_key_frequencies

    This is a list of the fundamental frequencies in hertz (cycles per second) of the keys of a modern 88-key standard or 108-key extended piano in twelve-tone equal temperament, with the 49th key, the fifth A (called A 4), tuned to 440 Hz (referred to as A440). [1] [2] Every octave is made of twelve steps called semitones.

  7. PSK31 - Wikipedia

    en.wikipedia.org/wiki/PSK31

    A waterfall display depicting several PSK31 transmissions at around 14.07 MHz. The green lines indicate a station that is transmitting. PSK31 or "Phase Shift Keying, 31 Baud", also BPSK31 and QPSK31, is a popular computer-sound card-generated radioteletype mode, used primarily by amateur radio operators to conduct real-time keyboard-to-keyboard chat, most often using frequencies in the high ...

  8. Tone contour - Wikipedia

    en.wikipedia.org/wiki/Tone_contour

    A tone in a contour-tone language which remains at approximately an even pitch is called a level tone. Tones which are too short to exhibit much of a contour, typically because of a final plosive consonant, may be called checked, abrupt, clipped, or stopped tones. It has been theorized that the relative timing of a contour tone is not distinctive.

  9. Phon - Wikipedia

    en.wikipedia.org/wiki/Phon

    Equal-loudness contours. The phon is a logarithmic unit of loudness level for tones and complex sounds. Loudness is measured in sones, a linear unit.Human sensitivity to sound is variable across different frequencies; therefore, although two different tones may present an identical sound pressure to a human ear, they may be psychoacoustically perceived as differing in loudness.