Glossary of terms

4:2:0digital video signal chrominance sampling standard
4:2:2digital video signal chrominance sampling standard – twice that of 4:2:0
4-wirestudio communication with separate send and return circuits enabling simultaneous bi-directional (two-way) conversations
601digital video standard (CCIR 601)
acquiring the birdlocating the satellite
AGCautomatic gain control
AMamplitude modulation
amplitude modulationa baseband message signal modulates (alters)the amplitude and frequency of a high frequency carrier signal at a nominally fixed frequency, so that the intensity, or amplitude, of the carrier wave varies in accordance with the modulating signal
analoguesignal which can take on a continuous range of values ...

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