As a key technology in digital quadrature demodulation system, the direct IF sampling filter with sharp cutting-off transition band can improve the performance of demodulation system.
中频采样是数字正交鉴相系统中的一项关键技术，具有锐截止特性的中频采样滤波器可以改善鉴相系统的性能。
They look like chipped cobbles, and they were made simply by taking one large piece of stone and striking it with another, chipping off a few bits to make at least one sharp cutting edge.
它们外表看来就像一颗颗稍稍锤击过的鹅卵石，而且它们制作简单，通常就是拿两颗石头互相锤击，至少把一端锤打出一个尖锐的边缘出来。
They look like chipped cobbles, and they were made simply by taking one large piece of stone and striking it with another, chipping off a few bits to make at least one sharp cutting edge.
它们外表看来就像一颗颗稍稍锤击过的鹅卵石，而且它们制作简单，通常就是拿两颗石头互相锤击，至少把一端锤打出一个尖锐的边缘出来。
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