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  2. Quadraphonic sound - Wikipedia

    en.wikipedia.org/wiki/Quadraphonic_sound

    Quadraphonic sound. Quadraphonic (or quadrophonic and sometimes quadrasonic) sound – equivalent to what is now called 4.0 surround sound – uses four audio channels in which speakers are positioned at the four corners of a listening space. The system allows for the reproduction of sound signals that are (wholly or in part) independent of one ...

  3. List of loudspeaker manufacturers - Wikipedia

    en.wikipedia.org/wiki/List_of_loudspeaker...

    Meyer Sound Laboratories: United States Meridian Audio: United Kingdom Mission: United Kingdom (brand) Magnat: Germany Mitek/MTX: United States Monitor Audio: United Kingdom Mordaunt-Short: United Kingdom Naim: United Kingdom NHT Loudspeakers: United States Onkyo: Japan Oswalds Mill Audio: United States Panasonic: Japan Peavey Electronics ...

  4. 819 line - Wikipedia

    en.wikipedia.org/wiki/819_line

    819 line. "Marly Horses" test card from RTF Alger (predecessor of TV1 Algeria) from 1956, originally in 819 lines. 819-line was an analog monochrome TV system developed and used in France [1][2] as television broadcast resumed after World War II. Transmissions started in 1949 and were active up to 1985, although limited to France, Belgium and ...

  5. Musical note - Wikipedia

    en.wikipedia.org/wiki/Musical_note

    The term note can refer to a specific musical event, for instance when saying the song "Happy Birthday to You", begins with two notes of identical pitch. Or more generally, the term can refer to a class of identically sounding events, for instance when saying "the song begins with the same note repeated twice".

  6. RCA Photophone - Wikipedia

    en.wikipedia.org/wiki/RCA_Photophone

    RCA Photophone was an optical sound, "variable-area" film exposure system, in which the modulated area (width) corresponded to the waveform of the audio signal. The three other major technologies were the Warner Bros. Vitaphone sound-on-disc system, as well as two "variable-density" sound-on-film systems, Lee De Forest 's Phonofilm, and Fox ...

  7. Stereophonic sound - Wikipedia

    en.wikipedia.org/wiki/Stereophonic_sound

    The inset shows the electronic simulation. Notably, such electronic systems require more than one speaker. Time difference in a stereophonic recording of a car going past. Stereophonic sound, or more commonly stereo, is a method of sound reproduction that recreates a multi-directional, 3-dimensional audible perspective.

  8. 5.1 surround sound - Wikipedia

    en.wikipedia.org/wiki/5.1_surround_sound

    The left and right surround speakers in the bottom line create the surround sound effect. 5.1 surround sound ("five-point one") is the common name for surround sound audio systems. 5.1 is the most commonly used layout in home theatres. [1] It uses five full bandwidth channels and one low-frequency effects channel (the "point one"). [2]

  9. Formant - Wikipedia

    en.wikipedia.org/wiki/Formant

    In speech science and phonetics, a formant is the broad spectral maximum that results from an acoustic resonance of the human vocal tract. [1][2] In acoustics, a formant is usually defined as a broad peak, or local maximum, in the spectrum. [3][4] For harmonic sounds, with this definition, the formant frequency is sometimes taken as that of the ...

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