https://www.nfsa.gov.au/sites/default/files/2025-02/Colour%20TV%20Mega%20Menu%203%20TVs_1000x745%20px.jpg
Double system
a) Projecting a film with the picture, on 35mm film, in interlock with the soundtrack, most commonly on mag film.
b) Film or video production that utilizes sound recorded on a separate tape recorder, such as a DAT or Nagra.
The National Film and Sound Archive of Australia acknowledges Australia’s Aboriginal and Torres Strait Islander peoples as the Traditional Custodians of the land on which we work and live and gives respect to their Elders both past and present.