| 摘要 |
PURPOSE:To know the call given from the remote station, by installing an aural signal generator to produce several types of calling aural signal and thus producing the calling aural signal corresponding to the selection signal which is received for the own station. CONSTITUTION:The selection signal (s) transmitted from the remote station to the station to be selected is received at each station by the selective receiver 9. The receiver 9 decides whether this selection signal selects the own station or not, and applies the decision signal (a) to the switch 3 according to the decision. At the station to be selected, the switch 3 is turned on by the signal (a). At the same time, the receiver 9 identifies the type of the signal (s) to apply the identification signal (b) to the memory 6. Then the memory 6 delivers the digital coded aural signal to the decoder 7 in correspondence to the applied signal (b). The decoder 7 applies the decode output to the A/D converter 8 to convert the output into the analog signal. |
