Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1977-11-25
1979-12-25
Murray, Richard
Facsimile and static presentation processing
Static presentation processing
Attribute control
358139, 358185, H04N 962
Patent
active
041808290
ABSTRACT:
For phase matching a first and second television signal, both signals are applied to the inputs of an electronic switching circuit, whose output is connected to a standard television monitor. The switching circuit applies the video portion of the first television signal to the monitor. For matching the phase of the synchronizing signals, the synchronizing signals from the first television signal are applied to the monitor for the first half of each field, those from the second television signal during the second half of each field. A visually detectable shift occurs between the top and bottom half of the picture displayed on the monitor if the synchronizing signals of the second television signal are not in phase with those of the first television signal. Similarly for color television signals, the video and synchronizing portions of the first television signal are applied to the monitor throughout each field while the color burst from the first television signal is applied for the first half of each field and that from the second television signal for the second half of each field. If the two color burst are not exactly in phase, the hue of the pictured display on the monitor will differ between the top and bottom half. Manual adjustment of the phase of the synchronizing signals or the color burst to eliminate the shift or the difference in hue, respectively, will cause the second television signal to be phased-matched with the first.
REFERENCES:
patent: 3958269 (1976-05-01), Davis
"Measurement Techniques in Television Studios etc.", The Radio and Electronic Engineer, Tecar et al., vol. 41, No. 3, Mar. 1971, pp. 113-125.
Crosspoint Latch Corp.
Murray Richard
Rich Marianne
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