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Fletcher 反复 this experiment at many 频率 The 频带宽度（带宽） of the 噪 just beginning to 影响 the 掩蔽 of a 特殊 音 he called the 批判 带/乐队 有效 at that 频率

Fletcher's 作品 encouraged other 科学家 to 探索 the 形状 of these so-called 批判 频带 of the 人类 听觉 系统 Instead of using two 音 which 产生 拍（音） some experi-menters used one 音 and a 带/乐队 of 噪 much narrower than the 批判 带/乐队

Simply stated the closer the probe 音 is to the 噪 带/乐队 the easier it is to 掩蔽 the 噪 That’s exactly what Fletcher said Only 声波 能量 near a 音 of a 特定 频率 is effec-tive in 掩蔽 it