ISO 389-4-1994 声学 校正听力设备的基准零级 第4部分:窄带掩蔽噪声基准级

标准号：ISO 389-4-1994
中文标准名称：声学 校正听力设备的基准零级 第4部分:窄带掩蔽噪声基准级
英文标准名称：Acoustics - Reference zero for the calibration of audiometric equipment - Part 4: Reference levels for narrow-band masking noise
标准类型：N65
发布日期：1999/12/31 12:00:00
实施日期：1999/12/31 12:00:00
中国标准分类号：N65
国际标准分类号：13.140
适用范围：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. Data are given for noise bandwidths of one-third and one-half octaves.