Motion picture digital sound system and method with primary sound storage edit capability
CA 2116028 C · Owner: Digital Theater Systems Corporation · Inventors: Ketcham, James S.; Dellaria, Joseph; Beard, Terry D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A digital sound system for motion picture films employs a digital time code (20) on the film (4) to trigger the transfer of sound data from a digital audio store (40) to a FIFO memory (42). The digital audio data is read out from the FIFO memory and played back in the theater at a constant rate, with any jumps in the digital time code handled by making a corresponding jump within the digital audio store but not in the FIFO memory. Readout from the FIFO memory and clocking of the digital-to-analog converters (DACs) (DAC 1-4) used for theater playback is synchronized to the AC mains (54) that powers the theater projector, and thus allows for an uninterrupted audio playback even if time code …
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed August 2, 1993 and granted March 23, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 2, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 2, 2015.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.