| 摘要 |
PROBLEM TO BE SOLVED: To generate two kinds of sampling frequencies accurately by selecting an output frequency from a 1st frequency variable crystal oscillator or an output frequency from a 2nd frequency variable crystal oscillator having a different center frequency from that of the 1st crystal oscillator and providing an output of the selected signal. SOLUTION: A 1st frequency variable crystal oscillator VCXO 3 generates a frequency within a frequency range around a prescribed center frequency, A 2nd frequency variable crystal oscillator VCXO 4 generates a frequency within a frequency range around a prescribed center frequency different from the center frequency of the oscillator VCXO 3. Then a changeover device 5 selects an output frequency from the oscillator VCXO 3 or the oscillator VCXO 4 and provides an output of the selected signal. |
