Perceived Level of Noise by Mark VII and Decibels (E)
Perceived Level of Noise by Mark VII and Decibels (E)
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Mark VII 感知的噪音水平和分贝 (E)
DOI：
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发表时间：
1972
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影响因子：
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通讯作者：
S. S. Stevens
中科院分区：
文献类型：
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作者：
S. S. Stevens
计算程序Mark VII给出了可感知的响度或噪声水平，单位为PLdB。它利用了一组基于平均25个实验轮廓的频率加权轮廓。标准参考声音定义为以3150赫兹为中心的13-OCT频段。感知到的音量(响度或噪音)随着声压的23次方增长，因此每增加9分贝，感知音量就会翻倍。总主观震级的求和公式仍然是ST = Sm + F (∑S − Sm)，但F的值作为电平的函数变化，以反映宽带噪声的非线性增长(在对数-对数坐标下)。由于新的参考声音为3150赫兹，以分贝为单位的感知水平(PLDB)大约比电话中较旧的响度水平低8分贝。除了8分贝的近乎恒定的差异外，对于典型的宽带噪声，Mark VI和Mark VII给出了非常相似的结果。8分贝的下移使声级计有可能有一个…
The calculation procedure Mark VII gives the perceived level of loudness or noisiness in PLdB. It utilizes a set of frequency‐weighting contours based on an average of 25 experimental contours. The standard reference sound is defined as a 13‐oct band centered at 3150 Hz. The perceived magnitude (loudness or noisiness) grows as the 23 power of the sound pressure, so that perceived magnitude doubles with each increase of 9 dB. The summation formula for the total subjective magnitude remains St = Sm + F (∑S − Sm), but the value of F is made to vary as a function of level in order to reflect the nonlinear growth (in log‐log coordinates) of broad‐band noise. As a result of the new reference sound at 3150 Hz, perceived level in decibels (PLdB) is approximately 8 dB lower than the older loudness level in phons. Except for the nearly constant difference of 8 dB, Mark VI and Mark VII give closely similar results for typical broad‐band noises. The 8‐dB downward shift makes it possible for a sound level meter with a...