| 摘要 |
PURPOSE: A wireless door view camera system is provided to sense a knock or voice at the door through an ECM and operate a view camera for a predetermined period of time to load the image of a visitor on an empty channel of a TV in radio. CONSTITUTION: A wireless door view camera system includes an ECM(11), a power supply(13), a frequency oscillator(21), a view camera(25), and a transmitter(30). The ECM receives a knock, bell sound, voice at the door. The frequency oscillator operates according to the power supply to generate a predetermined television channel frequency. The view camera operates together with the ECM and takes a picture of a visitor. The transmitter transmits a composite signal of a signal from the frequency oscillator and a signal from the view camera to a television receiver.
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