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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 calendar year can be divided into four quarters, [3] often abbreviated as Q1, Q2, Q3, and Q4. Since they are three months each, they are also called trimesters. In the Gregorian calendar: First quarter, Q1: January 1 – March 31 (90 days or 91 days in leap years) [4] Second quarter, Q2: April 1 – June 30 (91 days)
Some sources treat I/Q as a complex number; [1] with the I and Q components corresponding to the real and imaginary parts. Others treat it as distinct pairs of values, as a 2D vector, or as separate streams. When called "I/Q data" the information is likely digital. However, I/Q may be represented as analog signals. [7]
The first quarter of the year runs from January through March, the second quarter is from April through June, and so on. But companies operate on business-oriented “fiscal quarters” instead.
This quarter system was adopted by the oldest universities in the English-speaking world (Oxford, founded circa 1096, [1] and Cambridge, founded circa 1209 [2]). Over time, Cambridge dropped Trinity Term and renamed Hilary Term to Lent Term, and Oxford also dropped the original Trinity Term and renamed Easter Term as Trinity Term, thus establishing the three-term academic "quarter" year widely ...
The term also applies to a comparison of data in a period of the current quarter to the same period in the previous quarter. For example, the comparison of sales in April (i.e., the first month of Q2) to sales in January would be a quarter-over-quarter comparison. It is sometimes abbreviated as q/q. [citation needed]
The calendar year has 13 months with 28 days each, divided into exactly 4 weeks (13 × 28 = 364). An extra day added as a holiday at the end of the year (after December 28, i.e. equal to December 31 Gregorian), sometimes called "Year Day", does not belong to any week and brings the total to 365 days.
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