采样率是 96kHz，看频谱音频信号已经顶满 48KHz，但是很明显的是，20 多 K 以上部分是静音和噪音部分（30 K 以上），所以这个歌曲的有效信号其实就是 21KHz 以下。但它并没有出现高频很明显的截断，高频截止得比较自然，说明这个文件就是一个真的 CD 音质无损音乐强行升频出来的，升频后并没有带来任何的音质提升，而是引入了大量的高频噪音。
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The system collects data on restaurant operations and shares it via “Patty,” a voice that talks to employees through their headsets. If the drink machine is low on Diet Coke, Patty will tell the store’s manager. If a customer uses a QR code to report a messy bathroom, the manager will be alerted.