| 摘要 |
PURPOSE:To reduce the current consumption of the title receiver so that the battery of the receiver can be extended in service life by operating the receiver with high-speed clocks only when it is detected that the receiver itself is called during the receiving period of the group to which the receiver itself belongs, with the receiver being operated with low-speed clocks while the receiver itself is not called. CONSTITUTION:A control circuit 40 outputs ON/OFF control signals to a battery saving circuit 10 after acquisition of synchronism is completed to set a radio circuit 2 and demodulator circuit 3 to reception operating states during the receiving period of its own group 2 only. The control circuit 40 leads in and uses low-speed clocks generated from the 2nd clock oscillator 29 as operating clocks through the full period of one frame unless a call to its own receiver is detected. Upon detecting a call to its own receiver as a result of collation to individual number coding, the circuit 40 switches the operating clocks from the low-speed clocks to high-speed clocks generated by a 1st clock oscillator 91. Thereafter, message codes are decoded synchronously to the high-speed clocks and, upon completing the decoding, the operating clocks are returned to the low-speed clocks. |
