Pulse code modulated digital audio system
CA 1083488 A · Owner: Lase Industries · Inventors: Whitlock, William E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Applicant: William E. Whitlock, Docket No. 2081-101 For: Pulse Code Modulated Digital, Audio System BRIEF ABSTRACT, The instantaneous amplitude of an analog audio signal is periodically sampled to be converted into multibit binary digital words representing the sampled amplitude. The bits of successive binary words are reproduced serially with appropriate word and frame synchronising pulses in quarternary coding to pulse code modulate the FM carrier signal used in standard video recording. The recorded signal is demodulated on playback to reproduce successive digital words that are converted in-to discrete analog values which are low pass filtered to reproduce the original audio signal. 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 August 12, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 12, 1997.
- 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.