| 摘要 |
PROBLEM TO BE SOLVED: To allow for sound volume correction corresponding to noise generated in a mobile, while balancing easy listening and change in the original sound volume.SOLUTION: A correction step determination unit 13 acquires the detection noise level around a motor car detected by a noise level detection unit 11, and an acoustic correction unit 7 corrects the output sound volume on the basis of the detection noise level thus acquired. An acoustic level conversion unit 16, a correction volume calculation unit 17 and a correction step correction unit 18 control the correction amount of the acoustic correction unit 7 on the basis of the acoustic level of an acoustic signal output from a sound source 1, and a user set volume value specified by an operation unit 5. |
