TH23799A - "Field detector for video signal" - Google Patents

Abstract

Image shaking is displayed overlay. Compared with the main picture of the receiver The vision is avoided by providing an improved field-type detector that avoids the occurrence of a pause at the start of the field indication. Available override signal First Relationship On the number of clock pulses during the Change the negative side of the vertical empty signal and the positive transition of the subsequent horizontal empty pulse one is measured and When the count signal has a large value, distortion occurs at the start, change in the field indication device in response to the count signal

Claims (1)

1. In systems for processing video signals with a first and second alternate fields, the system consists of a source of An empty signal is converted from such video signal. And it is composed of a horizontal empty signal component and Along the verticals separated by periods Where differentiation of The interval of time of the dash The horizontal and vertical empty fields of the two consecutive fields are output as an ascending field. And a field detector clock pulse signal source to be incorporated by a stag counter trajectory: