Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1980-03-28
1981-07-28
Martin, John C.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358147, 358183, 358153, H04N 522, H04N 708, H04N 504
Patent
active
042813450
ABSTRACT:
The aim of the present invention is to make it possible to synchronize a digital memory with an existing TV-system, in which a TV-picture is transmitted with video interlace. According to the invention a corrected field synchronizing pulse is formed by means of a composite sync signal of the TV-system, which pulse, in spite of the video interlace, always appears at the starting point of a line and by means of which a part in an address counter for the memory associated with vertical addressing of the memory is reset to a starting position at the starting point of each picture field. The address counter is stepped for addressing purposes by means of a clock signal from a main oscillator, the frequency of which is controlled in response to a comparison between a line synchronizing signal derived from the composite sync signal and line frequency signals supplied from the address counter.
REFERENCES:
patent: 3898377 (1975-08-01), Fairbairn et al.
patent: 3982064 (1976-09-01), Barnaby
Globe Computers AB
Martin John C.
LandOfFree
Synchronization of digital memory with TV signal having interlac does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Synchronization of digital memory with TV signal having interlac, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Synchronization of digital memory with TV signal having interlac will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-551506