Abstract
To avoid adverse effects on sound quality when the level of an audio signal is raised, a speaker driving circuit having an ultralow range emphasizing circuit for emphasizing an ultralow range, a high-pass filter, and a switching circuit for removing the high-pass filter from an audio signal path when an audio signal to be supplied to a speaker is below a medium level and for inserting the high-pass filter in the audio signal path when the audio signal to be supplied to the speaker is above the medium level is provided.
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