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Aliasing Foldover

figure 1 16g shows a 波形 with eleven 周期 每（一个） ten 采样 This 中项 that one 周期 takes longer than the 间隔（音程） between 采样 This 关系 could also be 表示 as 11/10 周期 每（一个） 采样

figure 1 16i the 再合成 波形 is completely different from the 原始/原创 in one 重要 respect Namely the wavelength 长 of the 周期 of the 再合成 波形 is different from that of the 原始/原创 This kind of 失真 is called aliasing or foldover

The 频率 at which this aliasing occurs can be 预测 Suppose just to keep the 数 simple that we take 1000 采样 每（一个） second Then the 信号 in figure 1 16a has a 频率 of 125 周期 每（一个） second since there are eight 采样 每（一个） 周期 and 1000/8 = 125

The 频率 of the 原始/原创 信号 in figure 1 16g has been changed by the 采样 率 转换 过程 This represents an unacceptable change to a 樂/乐 信号 which must be avoided if 可能