| 摘要 |
Mute circuits capable of eliminating audible noise when the audio system is powered up and powered down are disclosed. A discharge element is coupled between an audio processing unit and an audio output unit in an audio system and a mute control unit is coupled to the discharge element. The mute circuit comprises an active element comprising a control terminal coupled to at least one power voltage at a power terminal of a functional element in the audio processing unit through a capacitor and turning on, by AC capacitor coupling, to drive the discharge element when the audio system is powered up, such that the discharge element is turned on to discharge an output current of the audio processing unit to a ground terminal, thereby muting the audio output unit to eliminate audible noise.
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