USB的设计概念之一,是将音频处理移至电脑之外进行,这是由于机身内的电力噪音环境容易产生干扰。采用USB之后,音频数据可一直保持其数字格式,直至输往外置放大器内的最后一个数模转换器为止。这些音频信号直接输往扬声器,得到高保真的音响效果。因此,它将有助于个人电脑成为普及的家用电器。这种设计不需装设个人电脑音响卡,可减少主机板的设计工作量与有关的额外成本。同时,可提供两条以上的通道,比个人电脑音效卡更为优异。由于所需的数据均储存于数字信号 One of the USB design concepts is to move the audio processing to the outside of the computer because the power noise environment in the body is prone to interference. With USB, the audio data remains in its digital format until it is transmitted to the last digital-to-analog converter in the external amplifier. These audio signals are fed directly to the speakers for high-fidelity sound. Therefore, it will help personal computers become popular household appliances. This design eliminates the need for a PC audio card, reducing board design effort and associated extra costs. At the same time, more than two channels can be provided, better than the PC sound card. Because the required data is stored in the digital signal