| 摘要 |
PROBLEM TO BE SOLVED: To provide a small and low-cost receiving set which has superior image disturbance-proof characteristics. SOLUTION: This receiving set provides a local signal source 5, which outputs a frequency which is ((2n-1)/4) times (where n: a natural number) a channel frequency interval, as high as or as low as a desired channel frequency of a receiving signal; a mixer 4, which inputs the receiving signal and the output of the local signal source, converts to an intermediate frequency signal and outputs it; a channel selecting filter 6, which inputs the intermediate frequency signal and passes only the desired channel components; and a decoder circuit 7 which inputs the output of the channel selecting filter 6 and decodes it. Thus, since the image frequency signal components can be made small, this receiving set enables obtaining superior image disturbance-proof characteristics, even if the amount of attenuation of the filter for elimination of the image components is small.
|
