Simple coefficient half-bandwidth digital filter for video data compression
CA 1308487 C · Owner: Grass Valley Group, Inc. (The) · Inventors: Michener, James A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure, A digital data rate compression system accepts an input digital signal having A plurality of samples at a given rate and outputs a digital signal at one-half of the given rate, or as an expansion system outputs a digital signal at twice the given rate. The digital data rate reduction technique uses multi-rate digital filtering in the form of a half bandwidth filter. In the case of the digital filter the input digital signal is separated into even and odd samples which are input to separate delay lines at one-half the given rate. The even samples are summed in pairs symmetrically about the center of the even delay line and each pair is weighted according to a …
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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 October 6, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 6, 2009.
- 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.