石头的外部噪声会被内部感知，它在盒形模块中传播并且音量会因为本身的金属结构而扩增。
The outside noise of the stones is perceived inside, it resonate in the box-shaped modules and it's amplified by the metal structure itself.
分析了一阶分形模糊控制滤波器的频率-幅度特性，白噪声和有色噪声分形盒维数的变化；
The frequency-magnitude response of the fractal filter and the change of fractal box dimension of white noise and color noise are analyzed.
在信号分形盒维数特征的基础上，提出利用噪声与授权信号分形盒维数的差异对授权用户是否存在进行检测。
Based on fractal box dimension feature of signals, this paper presents a spectrum sensing method employing the difference of fractal box dimension be tween noise and licensed signals.
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