| 摘要 |
PURPOSE:To realize the receiver which can meet any signal format, by inputting the signal of two frequency combined format or single frequency format and by identifying the signal format. CONSTITUTION:The receiver is provided with the relays M and U which can identify the format of signal and enable either on of the signal format reception. When the two frequency combined signal is incoming from the terminal, it is inputted to the signal identifying circuit F of the receiver REC. The identifying circuit F is provided with the relays which can response to the frequency of the incoming signal by the number required for the frequencies used. When one frequency signal is inputted, one relay is operated to easily identify the frequency. When the frequencies fh1 and fh2 are incoming, the relays H1 and L1 are operated and the incoming signal is identified with the combination of the relay contacts. Further, if the incoming signal having undesired signal format is inputted, it can operate the alarm AL with the relays M and U. |
