Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1988-12-16
1989-11-14
Shepperd, John W.
Facsimile and static presentation processing
Static presentation processing
Attribute control
H04N 1702
Patent
active
048811211
ABSTRACT:
A method and an electrical circuit determines the phase relationship between the color synchronization burst signal and horizontal synchronization pulses of a single color video signal and the color frame relationship between two color video signals. This is accomplished by regenerating on a line-by-line basis a color subcarrier signal which has a fixed phase relative to the leading edge of a horizontal synchronization pulse. A phase comparison is then made between regenerated color subcarrier signal and the color synchronization burst signal to develop a signal that represents the amount of phase error. The phase error signal is sampled to determine an average phase error for successive lines of the color video signal. Simultaneously, a phase comparison is also made between a 90.degree. phase-displaced version of the color synchronization burst signal and the regenerated color subcarrier signal to provide a quadrature phase error signal. The quadrature phase error signal can be compared to a color video reference signal to determine whether they have the same color frame. Both the video signal and the reference signal have independent timing circuits so that the signals need not be in synchronism to determine a color frame error. The amount of phase error and the existence of color frame mismatch is communicated to a user by means of a visual display monitor. The error is displayed as a separate image from other video images such that the size of the error image increases with an increase in phase error.
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Magni Systems, Inc.
Shepperd John W.
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