Patent ID: 8457326

Claim:
An output circuit for audio codec chip, comprising: a noise eliminating circuit electrically coupled to the audio codec chip for eliminating noise signals; the noise eliminating circuit comprising a first switch and a second switch, wherein when the audio codec chip output signals jump from low voltage level to high voltage level, the noise signals are grounded via the first and the second switches respectively; wherein the audio codec chip comprises an L-channel analog signal output terminal and an R-channel analog signal output terminal; the L-channel and the R-channel analog signal output terminals are grounded via the first and the second switches respectively; the noise eliminating circuit further comprises a first capacitor and a second capacitor; the L-channel analog signal output terminal is electrically coupled to the first capacitor first terminal; the first capacitor second terminal is electrically coupled to the first switch; the R-channel analog signal output terminal is electrically coupled to the second capacitor first terminal; and the second capacitor second terminal is electrically coupled to the second switch; the noise eliminating circuit further comprises a third switch; and the first and second switches receive an input voltage via the third switch; the first, the second and the third switches are transistors; the first switch base is electrically coupled to the third switch collector; the first switch collector is electrically coupled to the second capacitor first terminal; the second capacitor second terminal is electrically coupled to the R-channel analog signal output terminal; and the first switch emitter is grounded; the first and the second switches are NPN type transistors; and the third switch is a PNP type transistor.