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(′bak ¦pörch)

(electronics) The period of time in a television circuit immediately following a synchronizing pulse during which the signal is held at the instantaneous amplitude corresponding to a black area in the received picture.


 
 
WordNet: back porch
Note: click on a word meaning below to see its connections and related words.

The noun has one meaning:

Meaning #1: a porch for the back door


 
Wikipedia: back porch

Back porch refers to the portion in each scan line of a video signal between the end (rising edge) of the horizontal sync pulse and the start of active video. It was originally allocated to allow the slow electronics in early televisions time to respond to the sync pulse and prepare for the active line period.

With faster electronics making the delay unnecessary, the period has found other uses:

  • In color TV systems such as PAL and NTSC, this period includes the colorburst signal.
  • In some professional systems, particularly satellite links between locations, the audio is embedded within the back porch of the video signal, to save the cost of renting a second channel.

See also


 
 

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Copyrights:

Sci-Tech Dictionary. McGraw-Hill Dictionary of Scientific and Technical Terms. Copyright © 2003, 1994, 1989, 1984, 1978, 1976, 1974 by McGraw-Hill Companies, Inc. All rights reserved.  Read more
WordNet. WordNet 1.7.1 Copyright © 2001 by Princeton University. All rights reserved.  Read more
Wikipedia. This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Back porch" Read more

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