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  2. Phonofilm - Wikipedia

    en.wikipedia.org/wiki/Phonofilm

    Phonofilm is an optical sound-on-film system developed by inventors Lee de Forest and Theodore Case in the early 1920s. In 1919 and 1920, de Forest, inventor of the audion tube, filed his first patents on a sound-on-film process, DeForest Phonofilm, which recorded sound directly onto film as parallel lines. These parallel lines photographically ...

  3. Sound-on-film - Wikipedia

    en.wikipedia.org/wiki/Sound-on-film

    Sound-on-film is a class of sound film processes where the sound accompanying a picture is recorded on photographic film, usually, but not always, the same strip of film carrying the picture. Sound-on-film processes can either record an analog sound track or digital sound track, and may record the signal either optically or magnetically ...

  4. Optical sound - Wikipedia

    en.wikipedia.org/wiki/Optical_sound

    Due to film grain and possible dust on the sound track, optical sound could be noisy or have crackling sounds, especially when projecting worn release prints. In low-volume sections (where the noise would be especially noticeable) noise reduction was originally performed either by partly masking the track, or, in variable area recording ...

  5. Graphical sound - Wikipedia

    en.wikipedia.org/wiki/Graphical_sound

    Graphical sound or drawn sound (Fr. son dessiné, Ger. graphische Tonerzeugung,; It. suono disegnato) is a sound recording created from images drawn directly onto film or paper that were then played back using a sound system.

  6. Transfer-matrix method (optics) - Wikipedia

    en.wikipedia.org/wiki/Transfer-matrix_method...

    The transfer-matrix method is a method used in optics and acoustics to analyze the propagation of electromagnetic or acoustic waves through a stratified medium; a stack of thin films. [ 1 ] [ 2 ] This is, for example, relevant for the design of anti-reflective coatings and dielectric mirrors .

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  8. Sound-on-disc - Wikipedia

    en.wikipedia.org/wiki/Sound-on-disc

    Western Electric engineer E. B. Craft (on the left) demonstrating Vitaphone sound-on-disc film system. Sound-on-disc is a class of sound film processes using a phonograph or other disc to record or play back sound in sync with a motion picture. Early sound-on-disc systems used a mechanical interlock with the movie projector, while more recent ...

  9. FBI seizes websites that North Koreans allegedly used to ...

    www.aol.com/fbi-seizes-websites-north-koreans...

    The FBI has seized multiple websites that North Korean operatives used to impersonate legitimate US and Indian businesses in a likely effort to raise money for the nuclear armed-North Korean ...