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VL-SVN511BX/VL-SVN511CX/VL-SVN511CX1
4 Technical Descriptions
4.1.
What is a Video Intercom?
4.2.
Video Intercom
4.2.1.
Block Diagram
Here is the block diagram of Video intercom system in Fig 1.1.
The image data is converted into NTSC signal by Camera Unit. The NTSC signal is modulated into FM, then transferred to the
Monitor station through the interphone cable. Meanwhile the received FM signal is demodulated into the NTSC in the Monitor
station. The signal is converted into Y/C signal in LCD controller so that the image is displayed on LCD.
Fig. 1.1 Video intercom system block diagram
Next the voice route between the visitor and the responder is as follows:
the voice signal from the microphone of Door station is sent through a hybrid circuit and interphone cable to the speaker of Mon-
itor station. While the responder’s voice from the microphone of Monitor station reaches the speaker of the Door station through
the reverse route.
The Monitor station provides the Door station with DC power supply through the interphone cable. It means that the image sig-
nal, voice data and power are all sent through the interphone cable.
Содержание VL-MVN511BX
Страница 20: ...20 VL SVN511BX VL SVN511CX VL SVN511CX1 Reference Refer to Image Signal in Signal Route P 32 ...
Страница 21: ...21 VL SVN511BX VL SVN511CX VL SVN511CX1 Reference Refer to AM Signal in Signal Route P 32 ...
Страница 23: ...23 VL SVN511BX VL SVN511CX VL SVN511CX1 8 2 1 Defect of the Main Monitor Station Power Supply ...
Страница 24: ...24 VL SVN511BX VL SVN511CX VL SVN511CX1 Defect of the Main unit power supply ...
Страница 25: ...25 VL SVN511BX VL SVN511CX VL SVN511CX1 ...
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Страница 34: ...34 VL SVN511BX VL SVN511CX VL SVN511CX1 ...
Страница 40: ...40 VL SVN511BX VL SVN511CX VL SVN511CX1 9 2 3 1 Note for Microphone Assembly for anti feedback ...
Страница 44: ...44 VL SVN511BX VL SVN511CX VL SVN511CX1 9 4 Relay Box 1 Remove 4 screws 2 Remove the Cabinet and Relay Board ...
Страница 72: ...72 VL SVN511BX VL SVN511CX VL SVN511CX1 14 4 2 Relay Board Bottom View PNLB2484Z AP PbF VL RLY1 Bottom View A ...
Страница 74: ...74 VL SVN511BX VL SVN511CX VL SVN511CX1 15 1 2 Door Station ...
Страница 75: ...75 VL SVN511BX VL SVN511CX VL SVN511CX1 15 1 3 Power Supply Unit ...
Страница 76: ...76 VL SVN511BX VL SVN511CX VL SVN511CX1 15 1 4 Relay Box ...
Страница 77: ...77 VL SVN511BX VL SVN511CX VL SVN511CX1 15 1 5 Accessories and Packing Materials Location 15 1 5 1 VL SVN511BX ...
Страница 78: ...78 VL SVN511BX VL SVN511CX VL SVN511CX1 15 1 5 2 VL SVN511CX VL SVN511CX1 ...