| 摘要 |
An amplifier for a headphone is provided that can increase an upper limit on the amplitude of an audio signal generated between one common terminal and the output terminals of left and right channels, without raising the power supply voltage. The level at a common terminal C is changed corresponding to the average of the input audio signals (ViL, ViR) to increase the amplitudes of the output audio signals (VL, VR). In this way, the amplitudes of audio signals (VL, VR) supplied to the headphone can be increased compared with the case when the level at terminal C is kept constant. Also, the upper limit on the amplitudes of audio signals (VL, VR) can be increased without raising the power supply
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