Device for subband coding with samples scanned across frequency bands
CA 2060342 C · Owner: Nec Corporation · Inventors: Ohta, Mutsumi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A subband coding device has band-pass filters for band-limiting an input signal into band-limited signals having different frequency bands and downsampling circuits for downsampling the band-limited signals into subband samples. The input signal represents signal samples variable in one-dimensional or two-dimensional space. The subband coding device has a coder for coding the subband samples into a subband coded signal by classifying the subband samples into sample groups of classified samples and by scanning the classified samples of each of the sample groups across the frequency bands. The classified samples of each of the sample groups are selected from the subband samples in accordance …
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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 30, 1992 and granted October 7, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 30, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 30, 2014.
- 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.