Prior to this, the signal may have been harder to detect.
在此之前，很难察觉得到蛛丝马迹。
The receiving end is needed to detect the signal to restore the signal exactly.
为了准确恢复信号，接收端需进行信号检测。
First, the noise energy is tracked to detect the unstable signal.
首先通过跟踪平稳噪声能量，检测能量变化非平稳的信号；
First, the noise energy is tracked to detect the unstable signal.
首先通过跟踪平稳噪声能量，检测能量变化非平稳的信号；
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