数字脉冲的带宽为无穷大，但信号的大部分能量都集中在0-4/T的相对较窄的频带里，这个频带称为有效频带，也就是常说的宽带。
这样做的结果，使高频段有效信号的估计更加准确，能更好地改善去噪效果，从而达到拓宽有效频带的目的。
As a result, we accurately estimate the effective signals in high frequency band and better the noise suppression, thus broadening the effective frequency band.
最后通过对能反映源特征的频带信号进行重构，这样能更好更有效的提取声发射信号的本质特征。
At last, we recomposed some frequency band of wavelets, and the results can efficiently extract the features of acoustic emission signal.
为了克服这一性能差距，提出了一种有效的基于多频带uwb系统的差分编译码方案。
To overcome the gap, an effective differential encoding and decoding scheme for multiband UWB systems is proposed.
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