针对基于AD9874芯片的数字接收机的最小谱宽和谱宽允许设置的数目均不能满足常规临床用磁共振成像技术的要求，本文从软件角度提出了一种扩展数字接收机谱宽的二次抽取算法。

Here we propose a second decimation algorithm for widening the range of sweep width in the AD9874 based digital receiver to meet the sweep width requirement set by the clinic imaging pulse sequences.

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