To provide an interphone apparatus which has an image delay circuit to output image signals with delaying by a specified time and reduces a storage area of the image delay circuit.
The interphone apparatus has a master device 1, and child devices 2a, 2b and 2c, which are connected with the master device 1. The child devices 2a, 2b and 2c have a camera 22 which photographs visitors to output image signals, a human body detection sensor 23 which detects that visitors approach to output detection signals, a child device CPU 24 which outputs command signals that indicate human body detection after receiving a detection signal from the human body detection sensor, and an image delay circuit 25 which delays image signals by a specified time to output them. The master device 1 has a master device CPU 13 which receives command signals, a master device image switch 14 which is turned on by the master device CPU that received command signals, and a monitor 16 which displays delayed image signals through the turned-on master device image switch.
NAGAIYA AKIRA
OIWA MASASHIGE
OGAWA KENICHI
Hiromichi Watanabe