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The YIQ system is intended to take advantage of human color-response characteristics. The eye is more sensitive to changes in the orange-blue (I) range than in the purple-green range (Q)—therefore less bandwidth is required for Q than for I. Broadcast NTSC limits I to 1.3 MHz and Q to 0.4 MHz. I and Q are frequency interleaved into the 4 MHz ...
The two amplitude-modulated components are known as the in-phase component (I, thin blue, decreasing) and the quadrature component (Q, thin red, increasing). A sinusoid with modulation can be decomposed into, or synthesized from, two amplitude-modulated sinusoids that are in quadrature phase , i.e., with a phase offset of one-quarter cycle (90 ...
The YIQ color space at Y=0.5 in the IQ plane, normalized to a range of -1 to +1. Date: 9 June 2009: Source: Own work: Author: Tonyle: Licensing. I, the copyright ...
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Also in the bottom section are two sections that contain -In-phase and +Quadrature signals (see YIQ), centered on black level and having the same gain as the color burst signal; these show up on the pattern as a square of very dark blue, and a square of very dark purple. On a vectorscope, they appear as two short lines ninety degrees apart.
The final CPI release before the Fed's meeting is expected to be released at 8:30 a.m. ET on Wednesday. Wall Street economists expect headline inflation rose 2.7% annually in November, an increase ...
In the YIQ article, it says that broadcast NTSC limits I to 1.3 MHz, Q to 0.4 MHz, and Y to 4 MHz. That's where the percentages come from, though it's rather simplistic to map YIQ directly to RGB. Having less bandwidth is like having a smaller number of colors, if I understand correctly. - mak o 00:41, 24 March 2006 (UTC)
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