Abstract
This study determined if the maximum permissible ambient noise levels (MPANLs) for audiometry specified in the revision of ANSI S3.1-199x provided the same amount of threshold shift for monaural and binaural listening. Sound-field monaural and binaural warble-tone thresholds (125–8000 Hz) were obtained on 24 normal-hearing subjects in quiet (ambient) and in two background noise conditions. One noise condition approximated the ANSI S3.1-199x ears not covered MPANLs (ANSI noise). The other noise condition was 20 dB higher than the ANSI MPANLs (ANSI noise + 20). Monaural thresholds were about 2 dB higher than binaural thresholds in quiet and in each noise condition. The difference between the monaural minus the binaural threshold shifts in each noise condition (ANSI noise + 20 minus ambient; ANSI noise minus ambient) averaged over frequency was typically less than 1 dB. Thus the MPANLs in the revision of ANSI S3.1-199x are appropriate for both monaural and binaural testing.
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