Automatic volume adjustment method and device of vehicle-mounted player of bus

Abstract

The invention discloses an automatic volume adjustment method and device of a vehicle-mounted player of a bus. The automatic volume adjustment method includes the steps that voltage signals between the positive pole and the negative pole of a loudspeaker of a bus-stop reporter are collected and pre-processed; amplitudes of the pre-processed voltage signals are compared with voltage threshold values at a time interval, and a corresponding adjustment instruction is formed according to a comparison result; the volume of the vehicle-mounted player is adjusted according to the adjustment instruction. Compared with a loudspeaker sound signal collecting method in the prior art, the voltage signals between the positive pole and the negative pole of the loudspeaker are collected, the adjustment instruction is generated according to the voltage signals, interference of external sounds is effectively removed, and adjustment precision is improved; additionally, electrical signals are directly collected, conversion from the voltage signals to the sound signals and from the sound signals to the electrical signals in the prior art is avoided, adjustment time delay is reduced and adjustment real-time performance is guaranteed.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a method and device for automatically adjusting the volume of a player on a bus. Background technique [0002] At present, buses are generally equipped with vehicle-mounted players and vehicle-mounted stop announcers. When the bus is running between the stations, the loudspeaker on the car plays the signal of the car player (such as music, program video, advertisement video, etc.) to provide passengers with entertainment; and when the bus arrives at the station, The loudspeaker on the car plays the station site name broadcast by the vehicle station announcer and reminds passengers to get on and off the bus safely. After the vehicle station announcer finishes broadcasting, the speaker resumes playing the signal of the vehicle player. [0003] However, when the vehicle-mounted player and the vehicle-mounted stop announcer used on the bus are not a set of systems (that is, when...

AI Technical Summary

Problems solved by technology

This method needs to obtain the characteristic parameters of the environmental sound of the terminal through a pickup. When the volume difference is greater than the preset threshold, the frequency spectrum of the sound needs to be analyzed. The noise from inside and outside the car is very large, which poses a great challenge to the recognition algorithm and spectrum analysis of the station announcement sound. If the time is too long, it will affect the volume adjustment effect of the bus terminal

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