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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/Q data is a two-dimensional stream. 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.
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) Third quarter, Q3: July 1 – September 30 (92 days) Fourth quarter, Q4: October 1 – December 31 (92 days)
Q2, or the second quarter, refers to the accounting period of April, May and June. Any financial statements you receive from April 1 to June 30 are for Q2 of the fiscal quarter system.
IQ imbalance is a performance-limiting issue in the design of a class of radio receivers known as direct conversion receivers. [a] These translate the received radio frequency (RF, or pass-band) signal directly from the carrier frequency to baseband using a single mixing stage.
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]
In signal processing, a digital biquad filter is a second order recursive linear filter, containing two poles and two zeros. "Biquad" is an abbreviation of "biquadratic", which refers to the fact that in the Z domain, its transfer function is the ratio of two quadratic functions:
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