| 摘要 |
PROBLEM TO BE SOLVED: To provide a sound intermediate frequency conversion circuit for converting the frequency of a second SIF to a constant frequency without deteriorating sound receiving performance in the television receiver of a mobile body corresponding to a plurality of the frequencies of the second SIFs. SOLUTION: A second mixer (12) for inputting the output of a first mixer (10) converting the frequency of a first SIF, reference signal sources (14, 18), and a frequency divider (17) are provided. The output of the reference signal sources is made to pass the frequency divider. After that, the frequency of the second SIF is converted so as to be the constant frequency by executing frequency conversion with the second mixer (12). It is possible to convert to the constant frequency by switching the frequency division ratio of the frequency divider corresponding to the frequency difference between a VIF and the first SIF. COPYRIGHT: (C)2006,JPO&NCIPI |
