| Abstrakt: |
Earlier results [W. D. Ward, J. Acoust. Soc. Am. 54, 327 (1973)] indicated that an absence of interference with the process of recovery from TTS produced by bursts of an octave band of noise centered at 4 kHz occurred only if the level of the intervening noise (also 4 kHz) was 55-60 dB SPL or lower. Subsequent experimentation using 10 normal-hearing young listeners has confirmed this rather low value of effective quiet for this particular octave band. However, for both 1- and 2-kHz octave bands, effective quiet is reached at 70 dB SPL, and for 500 Hz at 75. It appears, therefore, that neither A- nor D-weighting will adequately represent the relative noxiousness of different octave bands using this particular criterion of hazard. [Research supported by the National Institute for Occupational Safety and Health, Public Health Service.] [ABSTRACT FROM AUTHOR] |
