Information transmission measurement and control system and method suitable for video intercom system

Abstract

The invention discloses an information transmission measurement and control system and method suitable for a video intercom system. The system comprises a main telephone module, a plurality of extension telephone modules and a transmission distribution network. The main telephone module comprises a main telephone carrier modulation and demodulation circuit, as well as a camera shooting component, a main telephone microphone, a main telephone speaker and a main telephone control system which are connected with the main telephone carrier modulation and demodulation circuit respectively, and also comprises a main telephone carrier frequency division multiplexing network in bidirectional communication with the main telephone carrier modulation and demodulation circuit; each extension telephone module comprises an extension telephone carrier modulation and demodulation circuit, as well as a display screen component, an extension telephone speaker, an extension telephone microphone and an extension telephone control system which are connected with the extension telephone carrier modulation and demodulation circuit respectively, and also comprises an extension telephone carrier frequency division multiplexing network in bidirectional communication with the extension telephone carrier modulation and demodulation circuit; and the transmission distribution network comprises a signal power hybrid circuit and a user distribution network, the signal power hybrid circuit is in communication with the main telephone carrier frequency division multiplexing network, and the user distribution network is in communication with all of the extension telephone carrier frequency division multiplexing networks. The system is high in anti-interference performance and excellent in stability.

Description

Technical field [0001] The invention belongs to the technical field of signal transmission, and particularly relates to a signal transmission measurement and control system and method in a building video intercom system. Background technique [0002] In the traditional video intercom system, the video, audio and data signals are transmitted in the form of baseband. At least four sets of transmission lines are needed to realize the network wiring. Secondly, the video and audio baseband signals are easily affected by various electrical appliances, Interferences such as hum from the power grid; thirdly, after long-distance transmission and multi-stage relay amplification, the picture quality of the image deteriorates and the sound quality of the voice decreases, and affects the stability of the system. [0003] In order to solve the problems inherent in the direct transmission of baseband signals, people have carried out research on applying carrier modulation and frequency division m...

AI Technical Summary

Problems solved by technology

However, the spectrum of the data carrier modulation signal and the spectrum of the voice signal (telephone sound quality 200Hz-3.4kHz) will obviously overlap with the spectrum of the image signal (0-6MHz), and frequency multiplexing and demultiplexing cannot be realized; The attenuation is very large and cannot be used for long-distance transmission

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