标准摘要
[中文适用范围]： 指定纯音测听中耳机气导所呈现的窄带掩蔽噪声的参考水平。 数据以要添加到相应纯音频率的参考等效阈值声压级的级别的形式给出。 给出了三分之一和二分之一倍频程噪声带宽的数据。 [外文原描述]： 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.
英文名称Acoustics — Reference zero for the calibration of audiometric equipment — Part 4: Reference levels for narrow-band masking noise