基准级 meaning in Chinese

reference level
reference signal level

Reference levels for narrow - band masking noise
窄带掩蔽噪声的基准级
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
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