Additional information signal superimposing and detecting system, additional information signal superimposing and detecting method, and additional information signal detecting method and apparatus therefor
CA 2245765 A1 · Owner: Sony Corporation · Inventors: Kimura, Yuji; Ogino, Akira; Moriwaki, Hisayoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Video signals are converted into one or more blocks for each predetermined unit amount of data and a DCT process is, performed in this block unit to convert the video signal from a time-base area signal to a DCT coefficient in a frequency area for data compression. As regards additional information consisting of spread spectrum signals, 1 chip of the spread spectrum signal is allocated to each block of the video signal or to each plural blocks, and the additional information is superimposed on the video signal as a constant level corresponding to the chip value for transmission. The video signal on which the additional information consisting of the spread spectrum signal transmitted has …
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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 August 25, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 25, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 25, 2020.
- 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.