Patent ID: 7058183

Claim:
A sound-correction apparatus in the audio apparatus installed in a vehicle comprising: an adjustment device adjusting the sound-volume in the full frequency range of the reproduced signal; a low-frequency-correction device which corrects the sound in the low-frequency range; a high-frequency-correction device which corrects sound in the high-frequency range; an extraction device that extracts a low-frequency component below the audible frequency of noise picked up by a microphone; a first detection device that detects the vehicle speed; a second detection device which detects the amount of adjustment by said adjustment device; a first calculation device that calculates the amount of low-frequency correction that is corrected by said low-frequency-correction device according to the ratio of said low-frequency component extracted by said extraction device, and said adjustment amount detected by said second detection device; and a second calculation device that calculates the amount of high-frequency correction that is corrected by said high-frequency-correction device according to said detected vehicle speed, wherein the extraction device comprises a low pass filter used to extract the low-frequency component below the audible frequency of noise picked up by the microphone.