| 摘要 |
PURPOSE:To reduce the transfer signal number for the telephone increment system connected with the radio link and with the repeater connected to the existing telephone circuit by using the dial signals as the transfer signals between handsets. CONSTITUTION:It is supposed that the handset not shown in the figure is connected to telephone circuit 4 via repeater 2 and by the known method. When the handset in question has the connection transfer to other handsets, the holding tone is transmitted. And the intermittence of the holding tone, if occurs, is detected by tone decoder 24, and control circuit 25 counts the number of intermittence of the tone. At the same time, tone generator 26 generates the call tone to call the handset corresponding to the count value. The call tone is then transmitted via modulator 15 and transmitter 13. After hang-up, the called handset has the same operation as that known already. |
