Front porch

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Portion of a PAL videosignal. From left to right: end of a video scan line, front porch, horizontal sync pulse, back porch with color burst, and beginning of next line

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. The front porch is the first component of the horizontal blanking interval which also contains the horizontal sync pulse and the back porch.^[1]

[edit] References

[edit] See also

• Back porch
• Vertical blanking interval
• Porch (as in buildings)

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