Single cable constant voltage broadcasting system having intercomm function

Abstract

The invention provides a single-cable constant-voltage broadcasting system with intercommunication function, which can realize the intercommunication and addressing functions based on an original public broadcasting. The broadcasting system is formed by a broadcast host machine, an instruction generator, a signal superimposer, a direct current power supply, a loudspeaker, a signal amplifier, a switch circuit and a microphone. A terminal control unit is formed by a power amplifying circuit, a signal separator, an acoustical pick-up, an instruction receiver, a switch circuit and a power supply module. The broadcasting system has the following substantive characteristic and advantage of realizing the intercommunication and addressing functions based on the original public broadcasting system without changing lines. The intercommunication can be randomly realized through assigning a certain terminal control unit to enter into the working state in a master control center at any time. The multi-point time-sharing automatic inspection tour monitor can be set through the programs of a PC terminal. Each terminal needing the intercommunication does not connect with a local power supply, which reduces the construction and the engineering cost.

Description

technical field [0001] The invention relates to a public broadcasting control system, in particular to a single-cable constant-voltage broadcasting system capable of intercom function. Background technique [0002] Public address systems are widely used in stations, docks, public squares, buildings, factories, schools, hospitals, etc. Although the functions of the public broadcasting system are becoming more and more perfect, it is still unavoidable to be limited by one-way transmission. The same problem plagues the development of video surveillance systems. Due to the need for security, video surveillance systems are increasingly appearing in people's lives. However, video surveillance systems are generally limited to one-way video transmission. At present, there is a lack of professional intercom equipment in public places on the market. There are too many limitations in the use of walkie-talkies; the intercom system with a simple pickup head structure has problems suc...

AI Technical Summary

Problems solved by technology

This has affected the normal development of rescue activities such as disaster relief and rescue, saving people's lives and property, and increased unnecessary losses.

Images