Mondo Knows Facts
Dolby Stereo put four channels on an optical track
The 1977 release of Star Wars helped make the format widespread Dolby Stereo encoded four channels, left, centre, right and a mono surround, onto a standard optical soundtrack using noise reduction, so a cinema could play it with the right decoder. Star Wars was an early and very loud advocate in 1977, and the format spread quickly through cinemas afterwards. It sits in Mondo's movies & tv collection, one of 200 facts that each trace back to the reference below.
Where this comes from
Facts that can change over time are reviewed and updated. If something here looks wrong, Mondo would rather know than be confidently incorrect.
Go further
More facts like this
Dolby noise reduction hushed optical soundtracksThe encoder boosted quiet passages on the print and the decoder turned them downDolby Atmos treats sounds as movable objectsThe mix stores a position for each sound rather than assigning it a speakerTHX began as a standard for cinema soundGeorge Lucas's company introduced it in 1983 alongside Return of the JediSurround sound uses six separate channelsFive full-range channels plus a low-frequency channel carry the mixActors often re-record their lines after filmingAutomated dialogue replacement fixes noise and rewrites in the editEarly sound films hired musicians to play on setLive orchestras performed behind the camera so actors had a beat to move to
🎬 Movies & TVfact 49 of 200
← → to keep reading, or swipe
Tags: sound, dolby, 1977
Dolby Stereo put four channels on an optical track: the short answers
- Where does this come from, and can I check it?
- The 1977 release of Star Wars helped make the format widespread. The figure is taken from Dolby, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
- Is this really a movies & tv fact?
- Yes. It sits on the Movies & TV shelf, one of 2,600 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.
- What else can I read about it?
- The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.