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DigitalVideoAndHDTVAlgorithmsAndInterfaces.pdf

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Voltage, mV<br />

700<br />

350<br />

BBC/ITA, Specification of television<br />

standards for 625-line system-I<br />

transmissions, published jointly by<br />

the BBC and the Independent<br />

Television Authority (now Independent<br />

Television Commission,<br />

ITC), Jan. 1971.<br />

0<br />

-300<br />

0H 4.7 Time, µs<br />

Figure 44.2 576i PAL<br />

composite analog waveform<br />

The electrical and mechanical interfaces for 4f SC PAL<br />

are derived from the Rec. 656 parallel and serial interfaces;<br />

see SDI coding, on page 396.<br />

Composite analog PAL interface<br />

Figure 44.2 overleaf shows a waveform drawing of luma<br />

in a 576i composite analog interface. The interface is<br />

detailed in Analog electrical interface and Analog<br />

mechanical interface, on page 408. The excursion of an<br />

analog composite 576i PAL signal with zero chroma,<br />

from synctip to reference white, is 1 VPP , comprising<br />

700 mV of picture and 300 mV of sync.<br />

The definitive reference to the 576i25 PAL composite<br />

analog signal is cited in the margin.<br />

534 DIGITAL VIDEO AND HDTV ALGORITHMS AND INTERFACES<br />

52<br />

64

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