Patent ID: 8199930
Filing Date: 2012-06-12
Classification: H03F,H03G

Abstract:
1. An audio output system utilizing a pop noise suppression apparatus for eliminating popping noise generated upon initiation of an audio output circuit, wherein the pop noise suppression apparatus comprising: a switch component connected to an output terminal of an audio output circuit to allow the audio output circuit to provide audio through the output terminal and to prevent the audio output circuit from providing audio through the output terminal in response to receiving a mute signal, wherein the switch component is a first transistor, a collector of the first transistor is connected to the output terminal of the audio output circuit, and an emitter of the first transistor is grounded; and a control circuit providing the mute signal for a first period of time in response to initiation of the audio output circuit and a third period of time in response to shutdown of the audio output circuit, the control circuit comprising: