| 摘要 |
A computer is provided to block the noise influence which is generated when installing a USB device by adding 5V power voltage source which is separated from the 5V power voltage which is added to the USB device to an audio amplifier. A computer comprises a power supply unit(10), a USB port(20), an audio amplifier(30), a first power source line(40) and a second power source line(50). The power supply unit receives DC voltage of predetermined level from outside such as an adapter or a battery. The power supply unit outputs the received DC voltage by converting the DC voltage into the DC voltage of predetermined level. A USB cable is connected into the USB port, and the first power source line is applied to the USB port. The audio amplifier accepts music sources by using a sound card installed in a computer, and the music source is added to the audio amplifier for driving speakers. And the audio amplifier receives voice signal from the computer, and amplifies and outputs the voice signal according to the second power source line.
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