Reaffirmed 2021

NATIONAL FOREWORD

This Indian Standard (Second Revision) which is identical with ISO 1999 : 2013 ‘Acoustics — Estimation of noise-induced hearing loss’ issued by the International Organization for Standardization was adopted by the Bureau of Indian Standards on recommendation of the Audio, Video and Multimedia Systems and Equipments Sectional Committee and approval of the Electronics and Information Technology Division Council.

This standard was originally published in 1973 and subsequently revised in 1994. The original version was based on ISO/R 1999 : 1971. First revision was based on ISO 1999 : 1990. The second revision of this standard has been undertaken to align it with the latest version of ISO 1999 : 2013.

The text of ISO Standard has been approved as suitable for publication as an Indian Standard without deviations. Certain terminologies and conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following:

a) Wherever the words ‘International Standard’ appear referring to this standard, they should be read as ‘Indian Standard’.

b) Comma (,) has been used as a decimal marker, while in Indian Standards, the current practice is to use a point (.) as the decimal marker.