Television – Synchronization – Phase locking regenerated subcarrier to color burst
Patent
1997-05-08
2000-03-28
Grant, Chris
Television
Synchronization
Phase locking regenerated subcarrier to color burst
348505, H04N 945
Patent
active
060438509
ABSTRACT:
A burst gate pulse generator circuit generates a burst gate pulse signal representative of a time period during which a burst signal is present within a composite video signal without requiring external components. Each period of the composite video signal includes a horizontal synchronization signal pulse, a burst signal and a video information signal. A pair of integrated capacitors are discharged during the horizontal synchronization pulse. The capacitors are charged at different rates by two current sources after the horizontal synchronization pulse. A first amount of charge across a first capacitor rises above a predetermined threshold level in a first time period. The burst gate pulse signal is activated when the first amount of charge rises above the predetermined threshold level. This occurs before the burst signal is present within the composite video signal. A second amount of charge across a second capacitor rises above the predetermined threshold level in a second time period. The burst gate pulse signal is deactivated when the second amount of charge rises above the predetermined threshold level. This occurs after the burst signal is complete within the composite video signal.
REFERENCES:
patent: 3730982 (1973-05-01), Niimi et al.
patent: 3789141 (1974-01-01), Ayaki et al.
patent: 3918085 (1975-11-01), Numakura et al.
patent: 4007482 (1977-02-01), Amari
patent: 4054903 (1977-10-01), Ninomiya
patent: 4120000 (1978-10-01), Ninomiya
patent: 4149180 (1979-04-01), Lovely
patent: 4165524 (1979-08-01), Ninomiya
patent: 4173023 (1979-10-01), Lagoni et al.
patent: 4228456 (1980-10-01), Lovely
patent: 4404583 (1983-09-01), Tatami
patent: 4550338 (1985-10-01), Kojima
patent: 4706034 (1987-11-01), Kojima
patent: 4714954 (1987-12-01), Yoshinaka et al.
patent: 4733311 (1988-03-01), Yoshinaka
patent: 5130785 (1992-07-01), Jang et al.
patent: 5325184 (1994-06-01), Choi
patent: 5386296 (1995-01-01), Craft
patent: 5844621 (1998-12-01), Ngo et al.
Nayebi Mehrdad
Ngo Duc
Grant Chris
Sony Corporation
Sony Electronics Inc.
LandOfFree
Burst gate pulse generator circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Burst gate pulse generator circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Burst gate pulse generator circuit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1330393