The noise spectrum at the modulator output is not flat.

调节器输出的噪声频谱并不平滑.

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Include noise spectrum, group when delay.

包括噪声频谱, 群时延.

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Test result shows that, there are important effect of protecting mesh diameter on noise spectrum distribution.

测量发现, 防护网钢丝直径对噪声频谱分布有重要的影响.

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However , the noise spectrum of the ash exhauster always centers at low frequency range.

排粉机噪声呈明显的低频特性.

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