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PD#SWPL-185990 Problem: The signal-to-noise ratio of the speaker output is small. Solution: Set the ALC parameter to automatically adjust the gain of the audio signal, ensuring that the amplitude of the output signal remains within the preset range, while improving the signal-to-noise ratio. Verify: test on T6D Change-Id: I8af12029b4ab46992367225dc740b22e085cd76a Signed-off-by: shaohui sheng <shaohui.sheng@amlogic.com>