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Compared with the power spectrum of signal a, the power spectrum of signal b narrows slightly, especially high frequency energy  is reduced somewhat.

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Compared with the power spectrum of signal a, the power spectrum of signal b is narrower slightly, especially with a reduced high frequency energy.

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The power spectrum of signal b is narrower slightly than that of signal a because of its reduced energy at high frequency.
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Compared with the frequency spectrum  of signal a, the frequency spectrum of  signal B is slightly narrower, especially the  part of high frequency  is reduced somewhat.
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