GB/T 4854.4-1999: Acoustics. Reference zero for the calibration of audiometric equipment. Part 4: Reference levels for narrow-band masking noise

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Scope

This Standard specifies reference levels for narrow-band masking noise presented by
air conduction from an earphone in pure-tone audiometry. The data are given in terms
of levels to be added to the reference equivalent threshold sound pressure levels for
the corresponding pure-tone frequencies as specified in GB/T 4854.1 or GB/T 16402,
respectively, when the masking earphone is placed on the appropriate acoustic coupler,
ear simulator or artificial ear.
Data are given for noise bandwidths of one-third and one-half octaves.
NOTE: some notes on the derivation of the reference levels are given in Annex A.

Basic Data

Standard ID	GB/T 4854.4-1999 (GB/T4854.4-1999)
Description (Translated English)	Acoustics. Reference zero for the calibration of audiometric equipment. Part 4: Reference levels for narrow-band masking noise
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	A42
Classification of International Standard	17.140.01
Word Count Estimation	8,879
Date of Issue	3/8/1999
Date of Implementation	9/1/1999
Quoted Standard	GB/T 4854.1-1999; GB/T 7341.1-1998; GB/T 7342-1987; GB/T 7614-1987; GB/T 16402-1996; SJ/Z 9114-1987; SJ/T 10659-1995
Adopted Standard	ISO 389-4-1994, MOD
Summary	This standard specifies the air conduction pure tone audiometer headphones narrowband masking noise emitted by the base class.