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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 ...
I(t) and Q(t) are the time-series data for the in-phase and quadrature components. S is the signal IQ data has extensive use in many signal processing contexts, including for radio modulation , software-defined radio , audio signal processing and electrical engineering .
Yi is a genus of scansoriopterygid dinosaur from the Late Jurassic of China.Its only species, Yi qi (Mandarin pronunciation: [î tɕʰǐ]; from Chinese: 翼; pinyin: yì; lit. 'wing' and 奇; qí; 'strange'), is known from a single fossil specimen of an adult individual found in Middle or Late Jurassic Tiaojishan Formation of Hebei, China, approximately 159 million years ago.
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.
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)
Yiqi Wu, founder and CEO at e-commerce-focused customer intelligence startup Aimerce, says this Black Friday is shaping up to be extremely competitive.
YIQ was formerly used in NTSC (North America, Japan and elsewhere) television broadcasts for historical reasons. This system stores a luma value roughly analogous to (and sometimes incorrectly identified as) [ 9 ] [ 10 ] luminance , along with two chroma values as approximate representations of the relative amounts of blue and red in the color.
The scope of the terms Y′UV, YUV, YCbCr, YPbPr, etc., is sometimes ambiguous and overlapping. Y′UV is the separation used in PAL.; YDbDr is the format used in SECAM and PAL-N, unusually based on non-gamma-corrected (linear) RGB, making the Y component true luminance.