| 摘要 |
PURPOSE:To attain the sure alarm operation and to prevent interference, by preventing a modulation signal from being transmitted when a pulse train of any one output among N-set of inputs is interrupted, in a digital radio device executing dirrerential logic modulation and procession. CONSTITUTION:A circuit 11 detecting a pulse train of N-input determined by the modulation system of the digital radio set executing differential logic modulation and procession is provided to detect the interruption of an input signal among the N-set inputs determined by the modulating system inputted to a differential logic converting circuit 9. If interruption is detected even in one input signal, M-set of outputs of the differential logic converting circuit 9 are fixed. Thus, a carrier not modulated is transmitted from the output of the modulator 10. |
