Where does this come from, and can I check it?

Sony printed two thin digital strips outside the picture area. The figure is taken from SMPTE, 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.

Mondo Knows Facts

SDDS hid eight sound channels at the frame edge

Sony printed two thin digital strips outside the picture area Sony Dynamic Digital Sound, launched in 1993, placed its data on the film just beyond the perforations on each side. Eight channels allowed five behind the screen and two surrounds. A reader in the projector picked up the data, with an optical track kept as backup. It sits in Mondo's movies & tv collection, one of 200 facts that each trace back to the reference below.

Where this comes from

SMPTE

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

Technology trivia

More facts like this

Film scanners copy a frame at a timeA sensor behind the lens records each picture while pins hold it in place Digital masters need copying every few yearsDrives fail and file formats go obsolete, so archives rewrite their holdings Digital cinema packages replaced reels of printsThe DCP is a set of encrypted files rather than a physical film The Red One brought 4K capture to low budgetsThe camera was announced in 2006 and shipped the following year Dolby Atmos treats sounds as movable objectsThe mix stores a position for each sound rather than assigning it a speaker Audio restoration lifts speech out of hissEngineers sample the noise between words and subtract that pattern from the track

Tags: sound, digital, 1990s

SDDS hid eight sound channels at the frame edge: the short answers

Where does this come from, and can I check it?: Sony printed two thin digital strips outside the picture area. The figure is taken from SMPTE, 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.