我发现我保存的大量 96kHz 和 192KHz 的音乐，都是普通的 CD 音乐强行升频的，感觉这个目前是高解析度音频的重灾区。当然不是所有这种音频的频谱都和上面一样，但是明显的特征是 21K 处有明显的边界，再以上的部分要么是全是静音，要么是静音和噪音的混合体，可能和使用的升频算法不一样导致的。
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That return statement will stop the execution of each and return from find_mod_2. If this was another language, or if each was implemented with a Proc rather than a yield, you would have to return a special value to indicate you wanted to stop, or raise an exception. This is how Crystal gets away with having no for loop in the language.4 Otherwise the block would simply cede control to the method that called it.
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