| 摘要 |
PURPOSE: A door vision including a voice information memo function is provided to offer voice information recorded in advance to a visitor and to allow the visitor to record voice information. CONSTITUTION: A door vision has an indoor device(200) and an outdoor device(100). The indoor device includes a mode selector(220) having a general mode select button(221), an absence mode select button(222), a recording mode select button(223) and a play mode select button(224), a microcomputer(280) for generating a control signal according to a selected mode, a low pass filter for low-pass-filtering a signal inputted through an indoor microphone(251), and a sample/hold unit(255) for sampling the output signal of the low pass filter. The indoor device further includes an A/D converter(257) for converting the output signal of the sample/hold unit into a digital signal under the control of the microcomputer, a memory(259) for storing the output signal of the A/D converter under the control of the microcomputer, a D/A converter(260) for converting the signal of the memory into an analog signal under the control of the microcomputer, a low pass filter(256) for low-pass-filtering the output signal of the D/A converter, and an amplifier(254) for amplifying the output signal of the low pass filter. The outdoor device has a calling button.
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