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Colorburst

In a color television signal, a generated analog video signal used to keep the chrominance sub-carrier synchronized.

Colorburst is an analog video, composite video signal generated by a video-signal generator used to keep the chrominance subcarrier synchronized in a color television signal. By synchronizing an oscillator with the colorburst at the back porch (beginning) of each scan line, a television receiver is able to restore the suppressed carrier of the chrominance (color) signals, and in turn decode the color information. The most common use of colorburst is to genlock equipment together as a common reference with a vision mixer in a television studio using a multi-camera setup.

In NTSC, its frequency is exactly 315/88 = 3.57954 MHz with a phase of 180°. PAL uses a frequency of exactly 4.43361875 MHz, with its phase alternating between 135° and 225° from line to line. Since the colorburst signal has a known amplitude, it is sometimes used as a reference level when compensating for amplitude variations in the overall signal.

SECAM is unique in not having a colorburst signal, since the chrominance signals are encoded using FM rather than QAM, thus the signal phase is immaterial and no reference point is needed.

Key Terms

analog video
chrominance subcarrier
colorburst
colorburst signal
composite video signal
frequency
line
mhz
phase
video signal generator

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Acronymn

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Synonymns

Colorburst
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Sources & Credits

Last modified on May 11 2019
Content adapted from Wikipedia
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