Therefore, taking advantage of AD device and digital filtering technique to realize mixing and other frequency transformation function is a comparatively advanced, novel and practical method.

因此，采用AD器件和数字滤波器技术实现混频等频率变换功能，是一种比较先进和新颖并且实际可行的方法。

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Objective It is to comparatively study the curative effect of Risperdal on behavioral and psychiatric symptoms (BPSD) of Alzheimer's disease (AD).

目的对照研究维思通治疗阿尔茨海默病(AD)行为和精神症状(BPSD)的疗效。

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