| 摘要 |
PROBLEM TO BE SOLVED: To suppress a high-cut function of a radio receiver in an electric field area in which high-band noise is comparatively small while powerfully removing the high-band noise in a weak electric field. SOLUTION: A received electric field intensity discrimination circuit 84 discriminates which area includes received electric field intensity, an area more than an intermediate electric field, a first weak electric field area adjacent to the intermediate electric field area, or a second weak electric field area lower than the first electric field area on the basis of a received electric field intensity signal output from an S meter circuit to control a mixing ratio of an output from a bypass circuit 114 and an output from an RC filter 112 in a mixer 110 in an HCC filter circuit 94. In an area of lower electric field intensity, much output of the RC filter 112 is mixed to remove a high frequency component more powerfully from a detected modulation signal. COPYRIGHT: (C)2009,JPO&INPIT
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