After the sequence passes through digital-to-analog converter and low pass filter, the desired frequency sweep signal is synthesized by the method of direct digital synthesis.

该序列通过数-模转换器和低通滤波器后，产生出频率扫描信号。

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After the sequence passes through digital-to-analog converter and low pass filter, the desired frequency sweep signal is synthesized by the method of direct digital synthesis.

该序列通过数-模转换器和低通滤波器后，产生出频率扫描信号。

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