Audio output apparatus and compensation method thereof
AssigneeALi Corporation
InventorsHorng-Pang Li, Chao-Yu Chen
Life of this patent
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Abstract
An audio output apparatus including a digital operation unit, a digital-to-analog converter (DAC), a left channel unit, a right channel unit and a common unit is provided. During an initial setting, the digital operation unit detects a cross talk voltage on a left channel earphone unit in the left channel unit or a right channel earphone unit in the right channel unit, calculates a first ratio and a second ratio, and then performs an arithmetic operation on a left and a right channel signals according to the first and the second ratios, so as to obtain a compensated left channel signal and a compensated right channel signal respectively for eliminating a cross talk phenomenon.
Claims12
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.
A method for compensating an audio output apparatus, which is used for compensating a cross talk phenomenon generated in the audio output apparatus, the method comprising:
- receiving a first ratio and a second ratio, wherein the first ratio is generated according to impedance values of low-frequency equivalent impedances of a left channel earphone unit, a left channel bead and a common bead, and the second ratio is generated according to impedance values of low-frequency equivalent impedances of a right channel earphone unit, a right channel bead and the common bead;
- receiving a left channel signal and a right channel signal;
- and
- providing a digital operation unit to perform an arithmetic operation on the left channel signal and the right channel signal according to the first and the second ratios, so as to obtain a compensated left channel signal and a compensated right channel signal.
Dependencies are inferred from the claim text.