Front porch

Front porch
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.

See also

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Last updated on Monday September 15, 2008 at 18:06:34 PDT (GMT -0700)
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