| 摘要 |
PURPOSE:To economize a receiver for both a dial pulse and PB signal, by providing a PB signal receiver circuit which converts number information of PB signal into codes and a circuit which convets those codes into dial pulses. CONSTITUTION:The PB signal of key telephone set is received from input terminal IP by PB signal reception part PBR and the low-frequency group or high-frequency group of it is sent to output terminal Fl or Fh of preceding circuit FE. Then, PB signal receiver circuit R discriminates the signal frequency inputted from Fl or Fh and converts number information, expressed by the PB signal, into binary code, for example, which are sent to converter circuit CONV. Circuit CONV converts those codes into dial pulses and then sends them to dial pulse counting part DPC, thereby operating relay AA. Consequently, number information on each digit of the received PB signal is stored in digit-coordinate receltion number storage circuit DA to DD of reception number storage part ST. Therefore, there is no need for a group of relays corresponding to PB signal frequencies, so that the constitution will be simplified. |
