vertical sweep การใช้

As discussed above, this does not exactly happen : the vertical sweep continues at a steady rate over a scan line, creating a small tilt.
In analog television receivers since at least the late 1930s, phase-locked-loop horizontal and vertical sweep circuits are locked to synchronization pulses in the broadcast signal.
"A person can get on the hill and outcrawl us, " said bulldozer operator Bob O'Keefe, describing the terrain with a near-vertical sweep of his hand.
These create a sawtooth wave : steady movement across the screen, then a typically rapid move back to the other side, and likewise for the vertical sweep.
Lecomte du Nou returned to the church's initial plan, placing the walls and the spire in one vertical sweep and eliminating the buttresses, thus giving the whole a much more sleek appearance.