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DigitalVideoAndHDTVAlgorithmsAndInterfaces.pdf

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714 2 Voltage, mV<br />

/ 7<br />

53<br />

0<br />

4 / 7<br />

-285 5 / 7<br />

0H 4.7 Time, µs<br />

IRE<br />

100<br />

7.5<br />

0<br />

-40<br />

52 8 /9<br />

63 5 / 9<br />

Figure 42.3 480i composite NTSC analog waveform showing the luma component, with setup.<br />

EIA, Industrial Electronics Tentative<br />

Standard No. 1 (IETNTS1),<br />

published on November 8, 1977.<br />

maximum chroma excursion to about 131 IRE, the<br />

maximum excursion of the composite NTSC signal is<br />

about 1.22 V PP .<br />

The composite NTSC analog interface is sometimes<br />

called RS-170. EIA Recommended Standard 170 was<br />

adopted in 1957; it defined the signal format for<br />

525/60.00 interlaced monochrome television at a field<br />

rate of exactly 60.00 Hz. This standard has been obsolete<br />

for nearly forty years. Revision A was proposed, but<br />

never adopted; had the revision been adopted, the<br />

standard would now properly be denoted EIA-170-A.<br />

The notation RS-170-A is technically erroneous, but it is<br />

widely used to refer to the timing diagram associated<br />

with 480i NTSC, as documented in the archaic EIA<br />

publication cited in the margin. SMPTE 170M, adopted<br />

in 1994, supersedes all of these.<br />

518 DIGITAL VIDEO AND HDTV ALGORITHMS AND INTERFACES

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