Method and apparatus for multiplexed encoding of digital audio information onto a digital audio storage medium
CA 2180002 C · Owner: Beard, Terry D. · Inventors: Beard, Terry D.; Ketcham, James S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Extra high quality or ultralong digital audio channels (CH1 Ch2...Chn) with an aggregate data bit rate that exceeds the maximum data bit rate for a digital storage medium (12) such as a CD, laser disk or digital audio tape are recorded on the audio medium. The, recording is accomplished by compressing (C1 C2...Cn) the data bit rates of the multi-channel input signals so that their aggregate data bit rate after compression does not exceed the maximum for the storage medium multiplexing (2) the compressd audio signals encoding (6), the multiplexed signal (32) into a predetermined format and recording (10) the encoded signal on the storage medium. Playback is achieved by decoding (16), …
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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
- Filed January 23, 1995 and granted July 13, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 23, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 23, 2017.
- 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
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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.