Underground intercom system

Abstract

The invention provides an underground intercom system, which includes a voice input unit, an amplification unit, an AD conversion unit, a coding unit, a lighting modulation circuit, a lighting unit, an optical concentrator, a photoelectric detector, an amplifier, a decoding unit, a DA conversion unit, a power Amplifying unit and voice output unit. The transmitter sends the collected analog audio signal to the control unit for amplification, AD conversion and Manchester encoding, and the digital signal is loaded to the lighting modulation drive circuit. The optical concentrator converges the optical signal to the photosensitive surface of the photodetector, the optical signal is converted into an electrical signal, and regenerated into the original Manchester coded signal, and then the signal is decoded and DA converted by the control unit. Finally, the signal is amplified and loaded onto the small speaker to restore the voice signal. The invention utilizes the outstanding advantages of high LED response sensitivity and good modulation performance to realize visible light wireless communication of LED miner's lights, and the background conditions of underground darkness and low reflection intensity are conducive to the transmission of visible light, and can realize both lighting and communication.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to an underground intercom system. Background technique [0002] In recent years, there has been underground short-range wireless voice communication using Bluetooth technology, but Bluetooth devices have disadvantages such as high power consumption, short communication distance, and easy interference. Other short-range wireless communication technologies include UWB (ultra-wideband) technology, ZigBee (wireless sensor) technology, and the like. These technologies all belong to radio frequency wireless communication, which have disadvantages such as high cost, difficult installation and high power consumption. In addition, the underground communication environment is harsh, and a large amount of coal mine dust, combustible gas and water vapor contained in the air will absorb radio waves, and the radio waves in the narrow roadway space are easily absorbed and reflected by rock...

AI Technical Summary

Problems solved by technology

In addition, mining equipment and exhaust facilities are placed under the mine, and a large number of barbed wires are distributed on and around the roadway. These metal objects will also absorb and interfere with radio frequency signals, affecting communication quality and transmission distance.

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