| 摘要 |
In a sound intermediate frequency conversion circuit, a second mixer receives an output of a first mixer which converts a first SIF; reference signal sources and receives an output of a frequency divider. The output of the reference signal source is got through the divider, and then a frequency conversion is performed by the second mixer so that the second SIF has a constant value. A frequency dividing ratio of the frequency divider is selected according to a frequency difference between a VIF and a first SIF. Thus, a conversion to a constant frequency is possible without deteriorating sound reception performance in a television receiver mounted in a mobile object.
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