Patent ID: 8254597
Filing Date: 2012-08-28
Classification: H03G,H04S

Abstract:
1. An audio signal processing circuit comprising: a plurality of variable gain amplifiers provided for respective ones of a plurality of channels, each of which amplifies an analog audio signal of the respective channel; an interface that receives, from outside, plural gain control data at different timing, plural gain control data specifying respective gain of the plurality of variable gain amplifiers; a plurality of gain controllers provided for respective ones of the plurality of variable gain amplifier, each of which switches gain of a corresponding one of the plurality of variable gain amplifiers, based on the corresponding one of the plural gain control data; and a timer that measures a predetermined data entry period and generates an active signal having a predetermined level when the data entry period has elapsed; wherein each gain controller receives the active signal and the corresponding one of the plural gain control data, and wherein when the active signal is generated, each gain controller changes the gain of the corresponding one of the plurality of variable gain amplifiers based on the corresponding one of the plural gain control data that has been received in the previous data entry period.