| 摘要 |
<P>PROBLEM TO BE SOLVED: To preferably control timing of switching of amplification gain of multi-channel audio signals. <P>SOLUTION: A plurality of variable gain amplifiers AMP1-AMP4 amplify audio signals of a plurality of channels for each channel. An interface unit 20 receives, from outside, two or more pieces of gain control data individually designating the gain of each channel. Gain control units CNT1-CNT4 switch the gain of the plurality of variable gain amplifiers AMP1-AMP4, based on the two or more pieces of gain control data. The gain control units CNT1-CNT4 arrange the timing to change the gain of the variable gain amplifier corresponding to the gain control data received in a predetermined data entry period, among the two or more pieces of gain control data that are input at different timing. <P>COPYRIGHT: (C)2009,JPO&INPIT |
