Glossary of terms
| 4:2:0 | digital video signal chrominance sampling standard |
| 4:2:2 | digital video signal chrominance sampling standard – twice that of 4:2:0 |
| 4-wire | studio communication with separate send and return circuits enabling simultaneous bi-directional (two-way) conversations |
| 601 | digital video standard (CCIR 601) |
| acquiring the bird | locating the satellite |
| AGC | automatic gain control |
| AM | amplitude modulation |
| amplitude modulation | a 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 |
| amplitude | magnitude |
| analogue | signal which can take on a continuous range of values ... |
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