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图3所示的数字调制器及它的互连情况。图中的发送数据,为便于转换成传医中使用的 DPSK 信号,它从同步串行形式医向调制器。由于数字调制器是数字化的,所以必需通过数/模转换器和一个滤波器把信息转换成模拟信息。
Figure 3 shows the digital modulator and its interconnection. The transmit data in the figure, from the serial form to the modulator for ease of conversion into the DPSK signal used in medical practice. Because digital modulators are digitized, it is necessary to convert the information into analog information through a digital-to-analog converter and a filter.