Everything about Color Burst totally explained
In
composite video,
colorburst is a signal used to keep the
chrominance subcarrier synchronized in a color
television signal. By synchronizing an
oscillator with the colorburst at the
beginning of each
scan line, a television receiver is able to restore the suppressed carrier of the
chrominance signals, and in turn decode the color information.
Explanation
In
NTSC, its frequency is 39375/11 k
Hz or 3.579545 MHz with a phase of 180°, whereas
PAL uses a frequency of 4.43361875 MHz, with its phase alternating between 135° and 225° from line to line.
SECAM is unique in not having a colorburst signal, since the chrominance signals are encoded using
FM rather than
QAM.
Since the colorburst signal has a known amplitude, it's sometimes used as a reference level when compensating for amplitude variations in the overall signal.
Crystals
An NTSC or PAL television's color decoder contains a colorburst
crystal oscillator.
These operate at some multiple of the colorburst frequency, such as 4
f = 157.5/11 MHz or 14.318 MHz for NTSC.
Because analog color TVs
were so common between the
1960s and
2000s,
economies of scale have driven down the cost of colorburst crystals, which often find uses in various other applications:
Applications of NTSC subcarrier-frequency crystals, with
f = 39375000/11 Hz, approx. 3.580 MHz, have included:
Further Information
Get more info on 'Color Burst'.
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