The frequency domain entropy of communication signal is smaller than that of environmental noise. We use the threshold method to distinguish whether the primary user is present.
通信信号的频域熵较小，噪声的频域熵较大，采用阈值判别法来判别授权频段是否存在授权用户的通信信号。
Easy to use software allows the user to graphically configure a custom signal processing flow using blocks such as biquad filters, dyna-mics processors, and surround sound processors.
借助方便易用的软件，用户可以利用双二阶滤波器、动态处理器和环绕声处理器等模块，以图形方式配置自定义信号处理流程。
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