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Therefore, the energy of the echo signal decreases as the signal frequency increases, as shown in Fig. 3(d).

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shawmar: ½ð±Ò+25, ·­ÒëEPI+1, ¡ï¡ï¡ï¡ï¡ï×î¼Ñ´ð°¸ 2015-03-16 10:01:59
Therefore, the energy of the echo signal decreases with the increase in signal frequency (Fig. 3d).
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