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1. GOST R ISO 389-4-2011
State system for ensuring the uniformity of measurements. Acoustics. Reference zero for the calibration of audiometric
equipment. Part 4. Reference levels for narrow-band masking noise
ГОСТ Р ИСО 389-4-2011
Государственная система обеспечения единства измерений. Акустика. Опорный нуль для калибровки аудиометрической
аппаратуры. Часть 4. Опорные уровни узкополосного маскирующего шума
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