| 单词 | noy value |
| 释义 | > as lemmasnoy value A unit of perceived noisiness. Frequently attributive in noy value.One noy is equal to the noisiness of a sound of specified bandwidth and intensity (see quot. 1959). ΘΚΠ the world > matter > physics > science of sound > [noun] > unit of sound > unit of perceived noisiness noy1959 1959 K. D. Kryter in Jrnl. Acoustical Soc. Amer. 31 1424/1 The following..steps were taken in arriving at the procedure suggested for the calculation of the perceived noise kind of a sound: Step 1. First, the word ‘noy’ was coined for the units on the scale of perceived noisiness. The numerical value of 1 was assigned to the perceived noisiness of the band from 910–1090 cps of random noise at a sound pressure level of 40 db re 0·0002 μ bar. 1963 H. G. Jerrard & D. B. McNeill Dict. Sci. Units 96 The noisiness of a jet aircraft taking off is about 110 noys. 1971 B. J. Smith Acoustics ii. 29 Find the total noisiness N from N = Nmax + 0·3(ΣN − Nmax) where Nmax = highest noy value and ΣN = sum of the noy values in all octave bands. 1991 C. M. Harris Handbk. Acoustical Measurem. & Noise Control (ed. 3) xlvii. 13 Table 47.1 shows the calculation of the sum of the noy values for each of the 24 bands for the spectrum of the aircraft noise. < as lemmas |
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