| 摘要 |
PROBLEM TO BE SOLVED: To provide an interphone device provided with a display function for identifying a call signal from a visitor even in a noisy environment, by an auraly handicapped person or after turning out a light. SOLUTION: When the visitor depresses the call button 17 of a slave set 2, the call signal is transmitted to an interface(I/F) through a line 3 and transmitted to a CPU 8. Then the CPU 8 identifies that the signal is the call one and outputs an operation indication to a driving circuit 11. The driving circuit 11 outputs a flicker signal to a master set display part 12 or a handset display part 16. The LEDs of the master set display part 12, e.g. arrayed in a master set 1, are turned on/off by the outputted flickering signal. An another display method, the flicker signal is outputted to a video circuit 9 by the call signal from the call button, then the black and white levels of a luminance signal are alternately and repeatedly displayed on the screen of a monitor 10.
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