| 摘要 |
PURPOSE:To revise a ratio of a call signal and an incoming call signal generated at random optionally according to the revision of the ratio of the call signal and the incoming call signal and to attain a simulation test under various conditions by revising the ratio of the call signal and the incoming call signal stored in a ROM circuit optionally. CONSTITUTION:A data comprising bits D0-D7 outputted based on a random number from a random number generating circuit 1 is inputted to a ROM circuit 2 as an address data, from which relevant address signal, call or incoming call signals are outputted. Then the call signal or the incoming call signal is inputted to an automobile telephone controller 3, in which prescribed control is implemented. In this case, since all addresses are shared for call signals and incoming call signals at a prescribed ratio, an address is selected based on the data generated at random from the circuit 1 and the ratio of the call signal and the incoming call signal outputted corresponding to the address is a prescribed ratio. Thus, the test is conducted under various conditions. |
