Digital information storage and retrieval using video signals
CA 1257695 A · Owner: American Telephone And Telegraph Company · Inventors: Worth, Joseph P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract, A method and apparatus for carrying digital information in video signals onto the recording format of audio compact disc (CD) systems. Input signals are divided into 8-bit samples and groups of thirty-three samples are treated as a frame. Upon encoding in accordance with the CD format, the frame is made to contain 576 bits which are converted to one hundred ninety-two 3-bit samples. The 3-bit samples are converted to analog levels and those analog levels comprise the video signals. Such a video signal can advantageously be stored in a video disc with exactly one frame of digital data being contained in the video line and stored in one track of the disc. In retrieving the …
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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
- Granted July 18, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 18, 2006.
- 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.