Measured in decibels, noise intensity can range from zero, the quietest sound the human ear can detect, to over 160 decibels.
按分贝计算,噪音强度可以从零(人耳所能感到的最低声音)到160分贝以上。
In standing wave method, the sound is not perfect standing wave, so the swing is not zero at wave knot.
驻波法中形成的声场不是理想驻波场,且波节处振幅不为零。
Zero-crossing detector is capable of predicting the shape changes of power spectrum so as to find the newly emerged moving sound sources in ambient noise.
过零检测器可以通过预报功率谱形状的变化来发现环境噪声中新出现的运动声源,研究了过零检测器的检测性能。
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