TELEVISION AS A SYSTEM
As shown in Fig. 30.36, television operates as a system, the station, and the numerous receivers within range of its signals. The station produces two kinds of signals, video originating from the camera or tape recording, and sound from a microphone or other source. Each of the two signals is generated, processed, transmitted separately, video as an amplitude-modulated signal, and sound as a frequency-modulated signal.
Considering such things as distance between stations, radiated power, geographic location, and topography, each station is assigned a particular channel to reduce the possibility of inter-channel interference. A station may operate in either of two bands. VHF (very high frequency) channels 2 through 13, extending ...
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