> -----Original Message----- > From: [email protected] [mailto:[email protected]] On > Behalf Of Bruce Griffiths > Sent: Tuesday, August 04, 2009 5:06 PM > To: Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] Method for comparing oscillators > > > http://www.uspto.gov/ > > > > patent search > > quick > > symmetricom in "Assignee Name" > > > > > Actually Timing Solutions corp would be better choice of assignee as > they developed the concept until swallowed/absorbed by Symmetricom > > Bruce > 1 7,436,166 Full-Text Direct digital synthesizer producing a signal representing an amplitude of a sine wave 2 7,227,346 Full-Text Two channel digital phase detector 3 5,315,566 Full-Text Time scale computation system 4 5,155,695 Full-Text Time scale computation system including complete and weighted ensemble definition
The second one, to Wayne Solbrig, looks interesting. The present invention is directed to a digital phase detector that is capable of being used in a phase measurement system to make very low phase noise measurements and, in one embodiment, as low as about 180 dB/Hz below the carrier frequency It would appear that some folks from Cal Tech and JPL, have used a similar technique in 7,511,469, for measuring small changes in laser frequencies. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
