Measurement of sc/h phase

Details Measurement of sc/h phase Measurement of sc/h phase

G - Physics

01

R

375/33

G01R 13/00 (2006.01) H04N 17/02 (2006.01)

Patent

CA 1271855

Abstract Apparatus for indicating the timing relation- ship between a reference point of a repetitive input signal, e. g. the horizontal sync point of a video signal, and a signal element that repeats at a higher frequency than the input signal, e. g. an element of the color burst, comprises a phase- locked oscillator for generating a continuous wave signal that is in phase with the signal element. The continuous wave signal is used to generate a train of pulses having a repetition frequency that is equal to the repetition frequency of the signal element and is selectively variable in phase rela- tive to the continuous wave signal, and this train of pulses is used to modulate a display of the repetitive input signal in a dimension other than one that is used in a normal waveform display, e.g. intensity. By alternately bringing the pulse train into phase with the reference point of the input signal and the higher frequency signal element, the phase relationship between the signal element and the reference point can be determined from the required phase adjustment.

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