Timing recovery for variable bit-rate video on asynchronous transfer mode (atm) networks
CA 2097349 C · Owner: American Telephone And Telegraph Company · Inventors: Haskell, Barin Geoffry; Reibman, Amy Ruth
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Complications of timing recovery in an ATM receiver are overcome by employing a first phase lock loop including a phase comparator filter, voltage controlled, oscillator (VCO) and output counter to lock to systems clock reference (SCR) values which are asynchronously received from a remote ATM transmitter. The SCR values represent the instantaneous values of a system timing clock (STC) at the instant of transmission of the asynchronous SCR values. In the receiver the output counter is first, set to the value of the initial received SCR value so that the derived STC is available for decoding data cells in the initial received packets. Then so-called Presentation/Decode, Time Stamps (PTS/DTS) …
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 May 31, 1993 and granted January 19, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 31, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 31, 2015.
- 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.