System of controlling exhaust sound of vehicle automatically and method of the same

摘要

A system and method automatically controls exhaust sound of a vehicle according to music chosen by a driver for the pleasure of driving. The system may include a media reproducing device which plays music and outputs a music playback signal, a control unit which analyzes a frequency of the music playback signal output from the media reproducing device and generates a drive signal according to the frequency, and a variable valve of a muffler installed in the muffler which adjusts the exhaust sound according to the drive signal output from the control unit.

主权项

1. A system of controlling exhaust sound of a vehicle automatically, comprising:
a media reproducing device which plays music and outputs a music playback signal; a control unit which analyzes a frequency of the music playback signal output from the media reproducing device and generates a drive signal according to the frequency; and a variable valve of a muffler installed in the muffler which adjusts the exhaust sound according to the drive signal output from the control unit, wherein the control unit comprises:
an input section which receives the music playback signal;an analysis section which analyzes the frequency of the music playback signal;a determination section which determines a mode of the music played currently according to the analyzed frequency of the music playback signal; andan output section which generates and outputs a drive signal according to a determined mode of the music, and wherein the analysis section produces a frequency histogram by transforming the frequency of the music playback signal, and wherein the analysis section classifies the frequency of the music playback signal into a low frequency band, a medium frequency band, and a high frequency band, and wherein the determination section determines a silent mode when a level of the medium frequency band is higher than a level of the low frequency band and a level of the high frequency band, and the determination section determines a sport mode when the level of the medium frequency band is lower than or equal to the level of the low frequency band or the level of the high frequency band.