Reference levels for narrow - band masking noise 窄带掩蔽噪声的基准级
2.
Acoustics - reference zero for the calibration of audiometric equipment - part 4 : reference levels for narrow - band masking noise 声学校准测听设备的基准零级第4部分:窄带掩蔽噪声的基准级
3.
Acoustics . reference zero for the calibration of audiometric equipment . part 4 : reference levels for narrow - band masking noise 声学.听力测定仪器的校准用基准0 .第4部分:窄频带遮蔽噪声的基准级