To increase the degree of integration by forming using digital devices and relates to a digital demodulator in H. D. TV to permit correct demodulation operations, selecting one of the carrier from the inputted signal to generate an I-channel signal of the baseband and digital converted into a signal and then it generates the Q-channel signal of the I channel signal and a predetermined phase difference by using a Hilbert transform in digital demodulation, and using the difference of the beat frequency to perform the carrier recovery operation it is possible to improve the demodulation performance It can facilitate ASIC design.
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