| 摘要 |
PURPOSE:To transmit transmission data to a specific person in an excellent way by transmitting repetitively a digital signal of one-frame constitution comprising a bit synchronism signal, a work synchronizing signal, a data signal, an address signal and an error correcting code for plural times. CONSTITUTION:After a required output signal from a microcomputer (muCom)1 is FSK-modulated 3 and amplified 4 via a waveform shaping circuit 2, the signal is transmitted from an antenna 6 via a switch 5 (contacts 5a, 5b are closed). On the other hand, the signal from the antenna 6 is inputted to a tuner 7 via the switch 5 (contacts 5a, 5c are closed) at reception, and after an output of the tuner 7 is FSK-detected 8 and waveform-shaped 9, the output is inputted to the muCom1 via a PLL circuit 10 and displayed 11. In applying communication to a specific person, e.g., secretary, a word is repeated four times in succession to the bit synchronizing signal, and when two or more of them are coincident, it is regarded that transmitted data is received accurately and it is displayed on a display device 11. |
