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on the high-frequency colour signal. Incorrect synchronisation means the phase will be off, and consequently the colour will be incorrect. Creating broadcast television usually involves mixing video signals. When doing this in an analogue way, it is essential that all signals have the same colour
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With the introduction of colour, the reference had to be much more accurate. In every composite video signal a reference burst is present in the horizontal sync portion, so all equipment in the chain will be synchronised roughly 16000 times per second. This regular synchronisation is necessary
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phase, which was achieved by synchronising all cameras with a black and burst signal. Because of cable length differences, every camera required a (often only slightly) different timing. This could be tuned at the reference source, and/or at the camera.
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signal with a black picture. It is a reference signal used to synchronise video equipment, in order to have them output video signals with the same timing. This allows seamless switching between two video signals.
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Black and burst can also be used to synchronise colour phase and provides timing accuracy in the order of tens of nanoseconds which is necessary to perform e.g. analogue video mixing.
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followed by 10 cycles of the colour sub carrier of video. For most variants of PAL video, the frequency of the sub carrier is 4.43361875 MHz.
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Before colour TV existed, the reference signal was also a black video signal. Inaccuracies meant the video picture would be shifted.
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Black and burst exists for various colour TV standards, such as
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Its natural waveform is a negative pulse with a level of -40
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Analogue synchronization signal used in broadcasting
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274:(Third ed.). Newnes Press. p. 14.
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207:Michael Talbot-Smith (1 January 1994).
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236:"World TV Standards and Waveforms"
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