Timing recovery for modems
CA 1163005 A · Owner: Plessey Overseas Limited · Inventors: Galpin, Robert K.P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention is an improvement on a technique of timing recovery from the line signal by envelope detection using double bandpass filtering prior to detection to improve the power ratio of the recovered timing signal to the interfacing by-products of the squaring process as disclosed in BSTJ March 1975 (Vol. 54 No. 3) pp 569-593 by Githin & Hayes entitled "Timing Recover" and Scramblers in Data Transmission". In the method disclosed in the article in addition the difference frequency components which are used to provide the desired timing signal, there are not only the sum-frequency products but also the products of squaring the individual bandpassed signal components, some of which may be …
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
- Granted February 28, 1984. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 28, 2001.
- 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.