RECEIVING CIRCUIT, RECEIVER AND RECEIVING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a receiving circuit which can correctly obtain a video detection output even when the video modulation degree of a video intermediate signal becomes over-modulation and even with respect to any video pattern and in which circuit scale is made large. SOLUTION: The receiving circuit has: a PLL (Phase Locked Loop) circuit 102 which outputs an oscillation signal synchronized with a phase of a modulation signal using a video signal as a modulated signal; a video detector 21 which outputs the video signal by performing synchronous detection of the modulation signal using the oscillation signal and a frequency detection circuit 33 which outputs a frequency detection signal indicating whether or not the above phase synchronization circuit is at a lock state by judging whether or not a frequency of the oscillation signal is within a predetermined range and controls the PLL circuit 102 using the frequency detection signal. COPYRIGHT: (C)2007,JPO&INPIT