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  2. RCA Photophone - Wikipedia

    en.wikipedia.org/wiki/RCA_Photophone

    Whereas the Western Electric/Westrex recorders with the ca. 1938 4-ribbon light valve (RA-1231, e.g., but not RA-1231A) were inherently capable of producing time-aligned sound negatives. The Westrex system was renamed Photophone after the Western Electric and Westrex registered trademarks were sold by AT&T and Litton Industries, respectively ...

  3. Movietone sound system - Wikipedia

    en.wikipedia.org/wiki/Movietone_sound_system

    The Movietone sound system is an optical sound-on-film method of recording sound for motion pictures, ensuring synchronization between sound and picture. It achieves this by recording the sound as a variable-density optical track on the same strip of film that records the pictures.

  4. THX - Wikipedia

    en.wikipedia.org/wiki/THX

    A concept sound system for the Lincoln Blackwood showcased the potential for in-car multi-channel surround sound, demonstrated at the THX booth at the Consumer Electronics Show in Las Vegas. The license ensured that high-performance audio systems in Lincoln vehicles met the exacting sound quality and performance standards of its new THX Ultra ...

  5. 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 .

  6. The best surround sound systems in 2024 - AOL

    www.aol.com/news/best-surround-sound-systems...

    Logitech Z906 5.1 $ at Amazon. Logitech Z906 5.1 $ at Walmart. 5.1 is the primary spec to meet in a surround sound system, and this setup from Logitech meets all the basic requirements, with a ...

  7. Optical sound - Wikipedia

    en.wikipedia.org/wiki/Optical_sound

    During filming, audio signals modulated the Aeo-light to expose the film's audio directly inside the camera, streamlining Phonofilm's process for synchronizing a motion picture with its soundtrack. In 1924, Sponable focused on the design of these single-system cameras, in which both sound and picture were recorded on the same negative.

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