| 摘要 |
PROBLEM TO BE SOLVED: To detect a phase inverted signal of which the frequency is not specified or of which the frequency error is great. SOLUTION: The present invention relates to a phase inversion detecting apparatus for detecting phase inversion in a signal of which the phase is inverted. The apparatus includes a phase inversion detecting means in which, at a point of time when the level of an input signal exceeds a first predetermined value, and/or a point of time when the level becomes lower than a second predetermined value smaller than the first predetermined value is detected and when an interval of the detected points of time is out of a predetermined range, phase inversion is detected. COPYRIGHT: (C)2007,JPO&INPIT
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