LOBBY STATION, DOOR PHONE SYSTEM AND COMMUNICATION METHOD

摘要

To make it possible to use many of existing facilities as they are without adding a new apparatus when switching from an analog system to a digital system. A camera module (104) captures a subject to generate digital video data, and sequentially applies compression processing on the digital video data. Controller (105) converts the digital video data subjected to the compression processing into a packet. Digital modulator (106) performs digital modulation on a digital data string of the packet and outputs a video signal of a carrier within a preset frequency band.