| 摘要 |
<p>A composition purpose signal generating apparatus, which includes an oscillator (11) for outputting a composition purpose signal, a frequency divider (12a,12b) for dividing the frequency of the composition purpose signal, a reference oscillator (9) for outputting a reference signal, a phase comparator (13) for outputting phase difference data which indicates a phase difference between the composition purpose signal and the reference signal, and a filter (14) for outputting the phase difference data output from the phase comparator as a control voltage of the oscillator, comprises composition purpose signal frequency changing means (15) for changing the frequency of the composition purpose signal when the frequency of a composite wave consisting of a basic wave or harmonic constituting a communication signal, which is an interference wave to the receiving signal, and a basic wave or harmonic constituting the composition purpose signal is almost equal to the frequency of the intermediate frequency signal.</p> |
