| 摘要 |
PURPOSE:To calculate and display automatically the communication rate by using a memory for telephone numbers, distance data and unit time, a timepiece circuit which outputs the time point data and an arithmetic circuit. CONSTITUTION:A memory 4 stores the time point data and the distance data through the data on a unit time table; while a memory 5 stores the office number data through the communication distance data. Furthermore a memory 6 stores the own office number supplied from a keyboard 3, plural telephone numbers of the remote sides and the calculated communication rate data. The telephone number of the remote side stored in the memory 6 is fed through the keyboard 3 after a handset 10 is hooked off. Then a control circuit 1 reads the telephone number out of the memory 6 and displays it to a display device 8. A dial signal generating circuit 11 transmits the dial signal to a telephone circuit L via a speech network 9. The circuit 1 reads the time point of a timepiece circuit 7 after detecting the inversion of polarity of the line L and reads the time point of a timepiece circuit 7. Then the circuit 1 calculates a communication rate from the time point when a ring-off is detected, the unit times supplied from memories 4 and 5 and the distance data and displays it to the device 8. |
