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As shown in Fig. 1, the more energy of the signal a is concentrated in low frequency band, resulting in its power spectrum becoming narrower than that of signal in Fig. b.
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Compared with signal b in Figure 2£¬the energy of signal a in Figure 1 was mainly concentrated in lower frequency bands, which resulted in narrowing the spectrum.
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As shown in Fig. 1, the majority of energy of signal a is concentrated in low frequency band, resulting in a relatively narrower spectrum when compared with the of spectrum of signal b in Fig.2

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As shown in Fig. 1, signal a output more energy in low, which cause its spectrum become relatively narrower than that of signal b in Fig. 2
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As shown in Fig. 1, more energy of signal a is concentrated in low frequency band, resulting in a narrower power spectrum compared with signal b as presented in Fig. 2.

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