中文说明：对信号进行三层变换，得到小波系数d和逼近系数a，得出各频段的能量。
English Description：
The wavelet coefficient D and approximation coefficient a are obtained by three-layer transformation of the signal, and the energy of each frequency band is obtained.
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中文说明：对信号进行三层变换，得到小波系数d和逼近系数a，得出各频段的能量。
English Description：
The wavelet coefficient D and approximation coefficient a are obtained by three-layer transformation of the signal, and the energy of each frequency band is obtained.