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您好,
它使用的是欠采样( undersampling ) 工作原理,欠采样是指fh > fs/2 时的情况。它主要是利用混叠现象实现以较低的采样频率对高频带通信号进行采样。
在下面链接 PDF中 1.4 过采样与欠采样 和 1.5 混叠 章节有相关介绍:
更多信息见:
http://www.ti.com/lit/an/slaa510/slaa510.pdf
http://en.wikipedia.org/wiki/Undersampling
下面视频也有相关知识: