CLOSED-CIRCUIT TELEVISION SYSTEM FOR PROVIDING HD IMAGE USING SINGLE TRANSMISSION LINE

摘要

PURPOSE: A single line transmission type digital closed circuit television system is provided to set a channel not to overlap each camera. CONSTITUTION: A link terminal(100) searches for a channel band of a downlink signal transmitted to an image collector(300,300A) through a communication line(10). The link terminal sets a channel which is not overlapped with the used channel in a downward signal transmitted from an uplink communication line. The link terminal modulates an image signal of a camera into a set channel. The link terminal synthesizes the modulated image signal with the downlink signal. An image collector modulates the downlink signal according to a channel.