Temporary Threshold Shift from Octave-Band Noise: Applications to Damage-Risk Criteria

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Abstract
The growth and recovery of temporary threshold shift in normal observers following exposure to octave-band noise is shown to follow the same course as that after broad-band noise: both are linear in log time. Rate of growth varies with frequency of exposure band and test frequency, being greatest at 4 kc following exposure to 2400-4800 cps or 1200-2400 cps, less at lower test frequencies and octave bands. The time for total recovery apparently is a function of the initial temporary threshold shift. The results support present damage-risk criteria for continuous noise, which suggest ear protection when octave-band levels exceed 85 db, and require it above 95 db.

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