Let us consider the block diagram of a digital computer as shown in Fig. 2-5.
让我们来考虑下图2 - 5所示(那样)的数字计算机的方框图。
Block diagram: a diagram of a system, instrument, computer, or program in which selected portions are represented by annotated boxes and interconnecting lines.
框图：用线框把一个系统，仪器，电脑或程序的主要部份围绕，并用线把它们注的图示。
And the hardware functional block diagram of the double channels DDS source by using AD9858 and chip monolithic computer 89c51is provided.
给出了利用89c51系列单片机和AD 9858组成的双通道直接频率合成器的设计框图。
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