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纯音修正因子
The spectral irregularity correction, called "tone correction factor", is made at each time increment for only the maximum tone.
频谱不规则性修正,又称为"纯音修正因子",是仅对每一时间增量内最大纯音所作的修正。
A tone correction factor C(k) is calculated for each spectrum to account for the subjective response to the presence of spectral irregularities.
(b) 考虑到人们对频谱不规则性的主观反应,对每一个频谱都要计算纯音修正因子C(k)。
For any i-th one-third octave band, at any k-th increment of time, for which the tone correction factor is suspected to result from something other than (or in addition to) an actual tone (or any spectral irregularity other than airplane noise), an additional analysis may be made using a filter with a bandwidth narrower than one-third of an octave.
If the narrow band analysis corroborates these suspicions, then a revised value for the background sound pressure level SPL'(i, k), may be determined from the narrow band analysis and used to compute a revised tone correction factor for that particular one-third octave band.
如果证实了这些质疑,则可以根据窄带分析确定本底声压级SPL'(i, k )的修正值,用来计算相应三分之一倍频程修正的纯音修正因子。
A36.4.4.2 After the value of PNLTM is obtained, the frequency band for the largest tone correction factor is identified for the two preceding and two succeeding 500 ms data samples. This is performed in order to identity the possibility of tone suppression at PNLTM by one-third octave band sharing of that tone.
If the value of the tone correction factor C(k) for PNLTM is less than the average value of C(k) for the five consecutive time intervals, the average value of C(k) must be used to compute a new value for PNLTM.
Note 2: In the absence of a tone correction factor, PNLTM would equal PNLM.
注2:如果没有纯音修正因子,PNLTM 就等于PNLM。
The tone correction factor is added to the perceived noise level to obtain tone-corrected perceived noise levels PNLT(k), at each one-half second increment
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