| 摘要 |
PURPOSE: A door vision with improved compatibility is provided to use all of cameras or monitors having different DC offset voltage levels. CONSTITUTION: A door vision with improved compatibility is composed of an outdoor device including a camera(11) for generating video signals and an audio unit(12) for outputting audio signals, and an indoor device that is connected to the outdoor device and displays images. The door vision further includes a video signal amplifier(21) for amplifying the output signal of the camera of the outdoor device, and a buffer(22) for receiving the output signal of the video signal amplifier and the output signal of the audio unit to transmit the signals to the indoor device, and separates DC offset voltages of the outdoor device and indoor device from each other.
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