| 摘要 |
A mobile terminal has an audio device to adjust the gain of an audio amplifier depending on whether the terminal is in an open or a closed position. The audio amplifier provides an audio signal to a speaker, and the volume of the audio signal is proportional to the gain of the audio amplifier. One of a plurality of gain control circuits is selected according to the position of the terminal and is provided to the audio amplifier to adjust the gain. Therefore, the gain of the audio amplifier may be greater when the terminal is in the closed position than in the open position. Alternatively, one of the gain control circuits may be selected according to a measure of the ambient noise surrounding the terminal, or may be manually selected by a user. |
