| 摘要 |
It is an object of the present invention to provide a radio receiving set which can prevent a deterioration of a reception quality even under a weak electric field. The radio receiving set comprises: an antenna selecting section 3 for selecting one of a plurality of antennas 2a - 2d which receive analogue television broadcasts; a receiving section 4 for reproducing a composite video signal Cvd and a composite synchronizing signal Csync from a reception signal Sin outputted from a selected antenna; a continuity judging unit 6 which, upon judging that the composite synchronizing signal Csync is not being continuously reproduced at a timely high frequency, generates a correction control signal CMP indicating a correction instruction, and which, upon judging that the composite synchronizing signal is being continuously reproduced at a high frequency, generates a correction control signal CMP not performing a correction instruction; a level detection unit 5 for detecting the level of each composite video signal Cvd reproduced by the receiving section 4 when the plurality of antennas 2a-2d are respectively selected by the antenna selecting section 3 at predetermined timings, and outputting respective level detection signals DLV(i); a correction unit 8 which, when correction control signal CMV indicating a correction instruction is generated, applies a correction processing to each of said level detection signals DLV(i), thereby generating respective correction detection signals DLVC(i)free from instability; and an antenna switchover control unit 9 which performs a comparison among the respective correction detection signals DLVC(i), controls the antenna selecting section 3 to select an antenna corresponding to a maximum correction detection signal. |
