A transmission system for digital audio broadcasting using pseudo-random number sequences in frame headers
CA 2199762 C · Owner: Wang, Jin-Der · Inventors: Wang, Jin-Der
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A digital audio broadcasting (DAB) system includes a radio-frequency (RF) transmitter and a corresponding RF receiver. The RF transmitter formats a DAB signal into a, sequence of frames, each frame having a header comprising a predefined grouping of pseudo-, random number sequences comprising 100 symbols. Of these 100 symbols 86 , symbols of, the header are used for frame synchronization and channel sounding (for characterization of a, communications channel) while the remaining 14 symbols are used for interleaver and data, synchronization in an interleaved fashion.
Read the whole patent
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 March 12, 1997 and granted August 7, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 12, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 12, 2019.
- 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.