Patent ID: 7865217
Filing Date: 2011-01-04
Classification: H04B

Abstract:
1. An electronic apparatus for reducing audio noise caused from unbalanced ground, the electronic apparatus comprising: a first circuit board comprising: a second circuit board comprising: a flexible board cable, utilized for coupling the first audio source of the first circuit board to the second circuit board; a grounding wiring, utilized for coupling the first reference grounding end of the first circuit board to the second circuit board; a selection unit, disposed on the second circuit board, having a first input end, a second input end, a third input end, a fourth input end, a first output end, and a second output end, wherein the first input end, the second input end, the third input end, and the fourth input end are respectively utilized for receiving the first audio source, the second audio source, the first reference grounding end, and the second reference grounding end, the selection unit selects one from the first audio source and the second audio source to output and selects one from the first reference grounding end and the second reference grounding end to output; and a receiver, disposed on the second circuit board, having an input end coupled to the first output end of the selection unit and controlled by the selection unit to be coupled to the first audio source or to the second audio source, and a grounding end coupled to the second output end of the selection unit and controlled by the selection unit to be coupled to the first reference grounding end or to the second reference grounding end; wherein when the first mode audio input is inputted, the selection unit selects to output the first audio source to the first output end and to be coupled to the input end of the receiver, and the selection unit selects to output the first reference grounding end to the second output end and to be coupled to the grounding end of the receiver; wherein when the second mode audio input is inputted, the selection unit selects to output the second audio source to the first output end and to be coupled to the input end of the receiver, and the selection unit selects to output the second reference grounding end to the second output end and to be coupled to the grounding end of the receiver.