| 摘要 |
PURPOSE:To send out a telephone number while confirming the sent-out number visually by sending out pulses to a trunk line/PBX circuit when an operator performs dial oscillation. CONSTITUTION:When the operator presses the dial pad 101 of the key telephone set, dial contacts in a matrix of 3X4 are made to send out a dial signal corresponding to the operated number to a dial pulse sending circuit 102. The dial signal is stored temporarily and then converted into a corresponding dial pulse, which is sent out to the trunk line/PBX circuit through a telephone network 103. At the same time, the pulse is encoded into a 4-bit binary code of 1, 2, 3-0, which is stored in a memory circuit 104. The stored dial pulse data is inputted to a decoder 105 at specific interval of time and decoded. This decoded signal drives a driver circuit 106 to display the corresponding number on a dial number display device 107. |
