Intercommunication system linking to telephone and TV networks includes audio and video assemblies monitoring visitor access and with analogue telephone operation

摘要

The intercommunication system linking to telephone and TV networks has analogue telephone line and subscriber interfaces, and a microphone, loudspeaker, keyboard, liquid crystal and video assembly. The system also undertakes diagnosis, remote control and access control functions. EMBODIMENT - The image of the visitor caught by the video camera is processed by TV channeling.