RECEPTION FIELD STRENGTH DETECTION CIRCUIT AND RECEPTION FIELD STRENGTH DETECTION METHOD

摘要

PROBLEM TO BE SOLVED: To provide a reception field strength detection circuit and reception field strength detection method thereof for a diversity receiver or the like which requires a high-accuracy and high-speed antenna selection means.;SOLUTION: A low-pass filter 4a is provided only in detectors 2c, 2d which operates with a weak electric field. Thus, since a baseband modulation signal is not residual in the weak electric field where a reception field strength becomes lower than or equal with a set threshold value, the reception field strength can be accurately detected and increase in frequency of channel switching caused by a malfunction of antenna selection, erroneous detection of phasing or erroneous recognition of high-speed movement can be prevented. Furthermore, a transient response time of reception field strength is also shorter than that of the conventional reception field strength, thereby reducing an antenna selection time.;COPYRIGHT: (C)2007,JPO&INPIT