| 摘要 |
PURPOSE:To enable to prevent miss-call and to make effective use of telephone sets, by giving various functions such as time display, number display and display of communication time and communication charge and by the digital display of various functions. CONSTITUTION:When telephone set is not used, only the time display circuit Z is operated with manual switch, and the signal output displays the time on the digital display section J via the display drive section E. Next, in calling the opposing party, the time is interrupted in interlocking with the switch in the telephone set switched with the removal of handset, and the call number with push button operation is sequentially displayed at the callout number display circuit X, drive section E and display section J. After that, when the opposing party picks up the handset, the communication circuit is closed, and the communication detection section F detects it to trigger the count section G and the communication time is displayed one after another with the drive section E and the display section J. Further, the content of counter in the section G is fed to the register separately provided for the operation of the charge per unit time, and the communication charge can be displayed after readout. |
