Vehicular broadcast control box

Abstract

The invention relates to a vehicular broadcast control box which comprises a microprocessor, a matrix keyboard, an audio encoding and decoding chip, an analog switch, a power amplifier chip, an SD card, a UIC568 bus, a loudspeaker, an audio simulation intercom chip, an RS485 bus, a seven-inch LCD screen and a microphone. Full-duplex simulation intercom between drivers or between the drivers and passengers is achieved through an integrated communication chip. A peripheral circuit is simple, communication noise is low, the audio effect is good, and the defects that in a traditional radio control box broadcast control box, a communication circuit is set up by discrete devices, noise is large, and the sound effect is poor are overcome. The design of a passenger alarm recording function is added, when the passengers give alarms, the conversation of the drivers and the passengers is recorded, and inquiring can be facilitated; a passenger room monitoring function is added, the condition of passenger room broadcasts can be learn by the driver conveniently; the seven-inch colorful LCD screen is used for displaying the work condition of a broadcast system, and visibility is achieved.

Description

technical field [0001] The invention belongs to the field of vehicle-mounted broadcast equipment, and relates to a broadcast control box, in particular to a vehicle-mounted broadcast control box. Background technique [0002] In the train broadcast system, the broadcast control box is mainly used to realize the driver's manual broadcast, semi-automatic broadcast, driver intercom, answering passenger alarm and other functions. The current mainstream design is to use independent operational amplifiers to amplify weak signals and discrete devices to eliminate sidetones. The circuit design is relatively complicated, and it is susceptible to interference, resulting in poor sound quality during artificial broadcasting or driver intercom, which seriously affects the experience of passengers. [0003] In addition, the existing design does not support the passenger alarm recording function, which is not conducive to the investigation and evidence collection of abnormal conditions in...

AI Technical Summary

Problems solved by technology

[0005] Technical problems to be solved: 1. The traditional broadcast control box uses discrete components to build a call circuit with large noise and poor sound effects.

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