What is the principle of the cooker lid used in TV sets?
The satellite antenna pot is what we often say, is a metal paraboloid, will be responsible for satellite signal reflection in satellite antenna tuner in feed and focus. The function of a satellite pot is to collect weak signals from satellites and to remove as much noise as possible. Most satellite pans are usually parabolic, and some of the multi focus satellite pans are made of spherical and paraboloid combinations. The satellite signals are reflected through a parabolic satellite pan and concentrated at its focus.
Satellite TV signals through the ground receiver antenna input to amplify the high frequency first, C - or KU - band signal transformThe signal frequency of 950 ~ 2150MHZ. The signal is fed into the tuner and re amplified in the tuner and processed by two frequency conversion. output36MHZ intermediate frequency signal, the signal through the QPSK (four phase shift keying) demodulator, I, Q analog baseband signals, analog baseband signals I, QAfter analog digital (A/D) conversion and QPSK decoding, forward error correction (FEC) and other processing, the satellite TV receiver output bytes of 8 bits MPEG - 2 numberAccording to flow. Demultiplexer MPEG - 2 data unpack, decomposition of sound, video and other data synchronization control. MPEG - 2 solutionCode complete audio, video decompression and decoding function, the data and information is reduced to complete image and sound signal, and televisionFrequency encoder, audio D/A transform, output TV analog audio, video signal.
Is it satellite TV? It is used to collect satellite signals. Because the satellite signal is very weak, the parabolic antenna to converge on the tuner.
Satellite TV receiving system is composed of a paraboloid antenna, feed, tuner, satellite receiver is composed of a complete set of satellite receiving station.function1, the paraboloid antenna is the star of the satellite signal energy reflection, convergence into one focus.2, the feed is located in the focus of the parabolic antenna set a satellite signal horn, known as feed, which means feeding the source of energy, requiring the energy will be gathered to focus all collected. Feedforward satellite receiving antenna basically by large angle corrugated feed.3 (also known as LNB, LNB downconverter) is used to reduce frequency and signal amplification and then transmitted to the satellite receiver signal sent by the satellite feed. The lower the degree of noise tuner.4, the satellite receiver is the satellite signal transmission to the tuner to demodulate the demodulated satellite TV image signal and sound signal.
