| 摘要 |
PURPOSE:To provide a miniaturized and effective noise preventing circuit for a portable telephone set. CONSTITUTION:Concerning the noise preventing circuit for portable telephone set to communicate with a communication channel designated from a base station by providing plural communication channels, memory, clock signal oscillating circuit and control part to be operated by a clock signal, the clock signal oscillating circuit 11 can control a clock signal frequency corresponding to a control signal (a) and a memory 8 previously stores the value of the control signal (a) for generating the prescribed clock signal frequency and information showing whether mutual interference is generated between the clock signal frequency and the communication channel. When any communication channel is designated from the base station, while referring to the memory 8, the control part 8 adjusts the clock signal oscillating circuit 11 by selecting the value of the control signal (a) for generating the clock signal frequency not to be interfered with that communication channel. |
