Blanking Level
Blanking Level – a) Refers to the 0 IRE level which exists before and after horizontal sync and during the vertical interval. This voltage level allows the electron beam to be turned off while it is being repositioned (retracing) across the face of the CRT into the position needed to start tracing the next visible line. b) The level of the front and back porches of the composite video signal. c) The level of a composite picture signal which separates the range containing picture information from the range containing synchronizing information. Note: This term should be used for controls performing this function (IEEE 100). d) The beginning of the video signal information in the signal’s waveform. It resides at a reference point taken as 0 V, which is 300 mV above the lowest part of the sync pulses. Also known as pedestal, the level of a video signal that separates the range that contains the picture information from the range that contains the synchronizing information.
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