| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To use a single mobile wireless communication device for different communication systems. <P>SOLUTION: The mobile wireless communication device is provided with the first crystal oscillator to supply the first master clock frequency for a time base of the first communication system, the second crystal oscillator to supply the second master clock frequency for the time base of the second communication system, the third oscillator to supply a clock signal with relatively low frequency inside the device; and a means to calibrate the respective first and second master clock signals to the clock signal of the third oscillator, and a means to determine a ratio of the first and the second master clocks, on the basis of the respective measured values of the first and the second master clocks to the clock signal with the relatively low frequency, can be obtained. <P>COPYRIGHT: (C)2004,JPO</p> |
