a porch for the front door
That portion of the composite picture signal which lies between the leading edge of the horizontal blanking pulse, and the leading edge of the corresponding sync pulse.
The blanking signal portion that lies between the end of the active picture information and the leading edge of horizontal sync.
Television usage: In a composite video signal, that portion of the signal between the end of the active video on each horizontal scanning line and the leading edge of the horizontal synchronization pulse.
The area of the video waveform between the start of the horizontal blank and the falling edge (start of) the horizontal sync.
The portion of the video signal between the end of active video and the falling edge of sync. See also back porch, horizontal blanking, and video waveform.
The omidyar.net Front Porch is being developed now and you can help make it happen! The idea is to build a place where newcomers can stop in and find ways to not only get involved in what's happening on this network (reading and writing posts about their passions), but also take actions and get involved in life (working together on taking those passions into the world).
The portion of the composite video signal which lies between the leading edge of the horizontal blanking pulse and the leading edge of the corresponding synchronizing pulse.
The portion of a composite picture signal that lies between the leading edge of the horizontal blanking pulse and the leading edge of the corresponding sync pulse.
The area of a composite video waveform between the end of the active video and the leading edge of sync.
In television broadcasting, the front porch is a brief (about 1.5 microsecond) period inserted between the end of each transmitted line of picture and the leading edge of the next line sync pulse. Its purpose was to allow voltage levels to stabilise in older televisions, preventing interference between picture lines.
