a) The portion of the video signal that lies between the trailing edge of the horizontal sync pulse and the start of the active picture time. Burst is located on the back porch.

b) The back porch of a horizontal synchronizing pulse is that area from the uppermost tip of the positivegoing right-hand edge of a sync pulse to the start of active video. The back porch of a color video sync pulse includes the 8 to 9 cycles of reference color burst. The back porch is at blanking level.