Michael S. Bernstein, Stanford University
频谱图的参数上图是一个 flac 无损文件的频谱图，最上面是这个文件的外在参数，采样率 48kHz、24bit，横轴是时间，纵轴是声音的频率，不同的颜色代表着不同的响度，也就是音量，可以参考图上最右侧的色条；当音量小到 -120db 以下，颜色就是黑色的，表示几乎没有声音。
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overall this was a really fun and interesting project. from start to finish this took me around 3 months. i learned alot from this project, from how to solder, how to 3d model, this was a really nice way to learn these skills.there are somethings i would've like to have done better or differently, namely making some custom pcbs in place of my usb hubs so i could have any i/o i want, and finding a better way to mount stuff instead of super glue lol.
size = hp[0]; /* read header */