Patent ID: 8526629

Claim:
An audio output apparatus, comprising: a digital operation unit, receiving a left channel signal and a right channel signal, performing an arithmetic operation to obtain a compensated left channel signal and a compensated right channel signal respectively; a digital-to-analog converter (DAC), coupled to the digital operation unit, receiving and converting the compensated left channel signal and the compensated right channel signal to a left channel analog signal and a right channel analog signal; a left channel unit, coupled to the DAC and the digital operation unit, having a left channel amplifying module, a left channel bead and a left channel earphone unit; a right channel unit, coupled to the DAC and the digital operation unit, having a right channel amplifying module, a right channel bead and a right channel earphone unit; and a common unit, coupled to the left channel unit and the right channel unit, having a common bead, wherein the digital operation unit performs the arithmetic operation to the left channel signal and the right channel signal according to a first ratio and a second ratio, so as to respectively obtain the compensated left channel signal and the compensated right channel signal, wherein the first ratio is generated according to impedance values of low-frequency equivalent impedances of the left channel earphone unit, the left channel bead and the common bead, and the second ratio is generated according to impedance values of low-frequency equivalent impedances of the right channel earphone unit, the right channel bead and the common bead.