| 摘要 |
PURPOSE: To surely attain selective call of an opposite station with a simple configuration by detecting plural slots of reception levels of each frequency signal for selecting a called station and making radio communication with a called station whose address is coincident with an address of a concerned station as the result of comparison. CONSTITUTION: A reception level detector DT detects only a respectively frequency f1 in a first time slot and the data bits are shifted by shift registers SR1 -SR4 . Only a reception frequency f3 is detected in a succeeding time slot and reception frequencies f2 , f4 are sequentially detected and data bits of the data are shifted by the shift registers SR1 -SR4 . A register 74 latches information equivalent to address data of a concerned station and the content is '1000', '0010', '0100', '0001' from high order bits. When the station address 71 is detected in the order of the reception frequencies f1 -f4 and a comparator 75 detects the coincidence with the latched content, the comparator gives an interrupt request signal IRQ to a CPU 67. Then the CPU 67 activates a demodulation section 58 and recover a data clock PCK, the identification are monitored. |
