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- W2081736360 abstract "Directional sensitivity patterns of a sound-level meter were measured both in an anechoic room and over a reflecting surface to find the disturbing effects of a nearby observer. The source was at a height of 1 m above the reflecting plane and the sound-level meter at a height of 1.2 m, the separation being 7.5 m. The tests indicate that, if the observer is to hold the sound-level meter in front of him, errors in readings due to his presence can be reduced by locating the source to his left or to his right. The most serious disturbances due to the observer occur at frequencies below 1000 cps. In one case, when the microphone was 56 cm in front of an observer facing the source, at 250 cps the observer reduced the reading by 4 db, whereas at 400 cps his presence increased the reading by 2 db. The disturbances can be reduced, at least for some directions and frequencies, if the observer wears an absorbent apron or overcoat. If measurements are to be made on sine-wave sounds with an accuracy of ±1 db and with a microphone at waist height, it appears that the observer must stand certainly more than 1 m away from the microphone. However, for a band of noise 13 octave wide a nearby observer has little effect unless he stands directly between the microphone and the source." @default.
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- W2081736360 date "1961-11-01" @default.
- W2081736360 modified "2023-09-26" @default.
- W2081736360 title "Some Effects of an Observer on the Readings of a Sound‐Level Meter" @default.
- W2081736360 doi "https://doi.org/10.1121/1.1936724" @default.
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