The channel decoding circuit in the set top box is equivalent to the tuner and the intermediate frequency amplifier in the analog television set. In the set-top box, the tuner is a must, but the tuning range includes satellite channels, terrestrial TV reception channels, and cable TV supplement channels. According to the modulation methods currently available in DTV, channel decoding should include QPSK, QAM, and OFDM demodulation functions.
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