Measurement of SC/H phase

Details Measurement of SC/H phase Measurement of SC/H phase

1984-04-23

1986-05-06

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 1702

Patent

active

045875510

ABSTRACT:
An instrument for use in indicating SC/H phase of a composite video signal comprises a display device for providing a polar display. A device generates a first input signal for the display device from the reference subcarrier burst of the video signal so as to cause the display device to display an indication at a predetermined angular position of the polar display. The time difference between the sync point and that zero crossing of the extended subcarrier wave which is closest to the sync point is determined, and is used to generate a second input signal for the display device such as to cause the display device to display an indication at a position of the polar display that is angularly spaced from a predetermined axis of the polar display by an angle given by the fraction having as its denominator the period of the reference subcarrier wave and as is numerator the product of the time difference and 360.degree..

REFERENCES:
patent: 3958269 (1976-05-01), Davis
patent: 4024571 (1977-05-01), Dischort et al.
patent: 4180829 (1979-12-01), Pires
patent: 4388637 (1983-06-01), Blair
patent: 4454530 (1984-06-01), Yoshinaka et al.
patent: 4470064 (1984-09-01), Michener

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