ISO 389-4:1994(R2015)现行
ACOUSTICS - REFERENCE ZERO FOR THE CALIBRATION OF AUDIOMETRIC EQUIPMENT - PART 4: REFERENCE LEVELS FOR NARROW-BAND MASKING NOISE
出版：International Organization for Standardization
专家解读视频
Defines reference levels for narrow-band masking noise presented by air conduction from an earphone in pure-tone audiometry.
PN EN ISO 389-4 : 2002 - Identical
BS ISO 389-4 : 1994 AMD 10484 - Identical
DIN EN 28798 : 1992 - Corresponds
DS EN ISO 389-4 : 1999 - Identical
GOST R ISO 389-4 : 2011 - Identical
