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Definition of "DBS receiver" |
electronic assembly that accepts as input a microwave signal from a satellite, containing transmitted TV signals “modulated” onto the signal. The receiver first amplifies the low-level signal, then processes the signal by first converting it to a lower “IF” frequency and then demodulating the signal to separate the TV signals from the microwave carrier signal. A basic way of looking at the relationship of the microwave carrier to the TV signal is to think of the carrier signal as an envelope with a message letter inside. The message letter is the TV signal. Demodulation is the process of carefully removing the message from the envelope (carrier). The noise figure of receiver is a measure of the amount of noise that will be added to the signal (carrier and TV signal) by the receiver. If the receiver adds too much noise, the result will be a snowy picture on the TV screen. |
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