The conclusion is that only when the minimum sample rate is more than the double of the band of the signal, can the signal been resumed without distortion.
得出结论：只有抽样信号最低抽样率大于两倍信号带宽时，才能保证信号的无失真恢复。
However, when the signal is a circularly band-limited, the minimum sampling density for a hexagonal sampling lattice is 13.
当连续图像信号的频带处于一个圆形区域之内时，正六边形点阵结构的采样密度比矩形点阵结构的采样密度要降低13。
However, when the signal is a circularly band-limited, the minimum sampling density for a hexagonal sampling lattice is 13.4% less than that for a rectangular sampling lattice.
当连续图像信号的频带处于一个圆形区域之内时，正六边形点阵结构的采样密度比矩形点阵结构的采样密度要降低13.4%。
You can take the IELTS test as many times as you wish, but you must wait 3 months before you retake the test. This is the minimum time considered necessary to improve upon your Overall Band Score.
你想参加多少次的雅思考试就能参加多少次，但是必须间隔至少三个月，这是提高你雅思成绩所必需的最短的时间。
You can take the IELTS test as many times as you wish, but you must wait 3 months before you retake the test. This is the minimum time considered necessary to improve upon your Overall Band Score.
你想参加多少次的雅思考试就能参加多少次，但是必须间隔至少三个月，这是提高你雅思成绩所必需的最短的时间。
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