| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a receiver that increases channels to be detected while controlling increase of a circuit scale. <P>SOLUTION: The receiver is configured such that: signals of an intraoffice channel and an upper adjacent channel, signals of an upper adjacent channel adjacent further to the upper side of the upper adjacent channel, signals of a lower adjacent channel and signals of a lower adjacent channel adjacent further to the lower side of the lower adjacent channel, in received signals, are sequentially selected by changing frequency of a locally oscillated output LO2, after a signal IF4 of a bandwidth for at least five channels adjacent to each other in the received signals branched by a distributor 6 is input in a mixer 18 and a signal IF7 which is frequency-converted by a locally-oscillated output LO2 is limited to the bandwidth for one channel by a detection filter 20 and extracted as a signal IF8; a signal level of each channel is held to a data capture-hold circuit 22; and interference of adjacent channel adjacent further to the adjacent channel in addition to the interference of the adjacent channel is detected by the signal level of each channel. <P>COPYRIGHT: (C)2011,JPO&INPIT |
