Satellite receiver refers to the electronic equipment that converts the output signal of satellite down-converter LNB into audio and video signals or radio frequency signals. Analog satellite TV receiver-receives analog signals, but at present, most of the signals have been digitized and basically disappeared. Digital satellite tv receiver, which receives digital signals, is a commonly used receiver at present, and it is also divided into card digital machine, free machine and high-definition machine. A basic satellite TV receiver usually includes the following parts: electronic tuning channel selector, intermediate frequency amplifier and demodulator, image signal processor, audio signal, demodulator, front panel indicator and power supply circuit. The card digital machine also includes a card interface circuit and the like.