Patent ID: 7747028

Claim:
A method for improving voice clarity by controlling a gain of a voice based on a sound pressure level of the voice and a sound pressure level of noise, comprising: determining whether a sound pressure level of a gain-controlled voice exceeds a maximum allowable level, the determination being performed by a determining unit; determining whether the sound pressure level exceeding the maximum allowable level is caused by an audio sound when the sound pressure level of the gain-controlled voice exceeds the maximum allowable level, the determination being performed by a cause searching unit; and reducing a sound pressure level of audio sound when the sound pressure level of the gain-controlled voice exceeds the maximum allowable level, wherein the sound pressure level of the audio sound is minimally reduced so that the sound pressure level of the gain controlled voice becomes equal to or lower than the maximum allowable level, the reduction in sound pressure level being performed by an audio sound pressure level control unit.