DEMODULATOR, BROADCAST SYSTEM AND BROADCAST RECEIVER

摘要

PROBLEM TO BE SOLVED: To provide a demodulator that reduces a time required for demodulation so as the conduct efficient demodulation control with high quality. SOLUTION: A digital signal generating means 21 generates a digital signal corresponding to a phase axis from a modulated input signal. A frequency correction value output means 22 outputs a frequency correction value. A frequency correction 3 give a frequency offset to the digital signal on the basis of the frequency correction value to generate a frequency correction signal. A timing recovery means 24 extracts symbol timing of the frequency correction signal to conduct timing recovery. A C/N detection means 25 detects a C/N from a symbol. An optimum frequency correction value decision means 26 uses the frequency correction value when the C/N is highest for the optimum frequency correction value. A carrier recovery means 27 finally corrects a frequency offset of the signal subjected to frequency correction and timing recovery by the optimum frequency correction value to conduct carrier recovery. A synchronization detection means 28 corrects a symbol error to detect a unique word.