horizontal blanking pulse
horizontal blanking pulse[‚här·ə′zänt·əl ′blaŋk·iŋ ‚pəls]
The rectangular pulse that forms the pedestal of the composite television signal between active horizontal lines and causes the beam current of the picture tube to be cut off during retrace. Also known as line-frequency blanking pulse.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.