Video line selector


A video line selector is an electronic circuit or device for picking a line from an analog video signal. The input of the circuit is connected to an analog video source, the output triggers an oscilloscope, so display the selected line on the oscilloscope or similar device.

Properties

Video line selectors are circuits or units of other devices, fitted to the demand of the unit or a separate device for use in workshops, production and laboratories. They contain analog and digital circuits and an internal or external DC power supply. There's a video signal input, sometimes an output to prevent reflexions of the video signal and the cause of shadows of the video picture, also a trigger output. There is also an input or adjust for the line number to be picked out and as an option an automatic or manual setting to fit other video standards and non-interlaced video. Video line selectors do not need all the picture signal, just the synchronisation signals are needed. Sometimes inputs for H- and V-sync were installed, only.

Applications

Video line selecting was used in laboratory, production, and workshop:
Monitoring television picture content:
For modifying television signals:
As precise optical sensor: