| 摘要 |
A carrier reproducing circuit capable of judging the polarity of oppositiona l frequency. A TMCC section is detected from the synchronous detection output from a synchronous detection circuit (1) by a TMCC section detecting circuit (4), the synchronous detection output is converted to a signal point arrangement by a signal point arrangement converting circuit (5), the phase of the converted signal point position signal is rotated at a predetermined angular velocity for each symbol of the TMCC by a phase rotating circuit (8) , the signal position signal whose phase is rotated is phase-detected by a pha se detector (6), an auto-correlation function of the phase detection output in the TMCC section is determined by an auto-correlation function determining circuit (7) and angular velocity information based on the period of the waveform of the determined auto-correlation function is obtained, the phase- rotation angular velocity at the phase rotation circuit (8) is subtracted fr om the obtained angular velocity by a subtracting circuit (9), and sine and consine wave data on frequency based on the output of the subtraction are generated and sent to the phase detection circuit (1) by a numerical control oscillator (2).
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