GB/T 4854.4-1999

Active

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

Standard Type
GBT
ICS
13.140
CCS
A42
Status
Active
Issue Date
1999-03-08
Implementation
1999-09-01
Centralized Committee
中国科学院
Issuing Authority
国家质量技术监督局

Application Summary AI generated

This standard specifies reference levels for narrow-band masking noise used in audiometric testing, ensuring consistent calibration of equipment across hearing clinics and occupational health settings. It is applied when calibrating audiometers and sound systems that deliver masking noise during pure-tone hearing threshold measurements. The standard ensures that masking noise levels are accurately referenced to normal hearing thresholds, enabling reliable hearing loss diagnosis and industrial noise exposure assessments.

Related Standards

GB/T 7582-2004 Acoustics--Statistical distribution of hearing thresholds as a function of age GB/T 4854.1-2004 Acoustics--Reference zero for the calibration of audiometric equipment--Part1:Reference equivalent threshold sound pressure levels for pure tones and supra-aural earphones GB/Z 21233-2007 Acoustics - Assessment of noise annoyance by means of social and socio-acoustics surveys GB/T 4854.7-1999 Acoustics--Reference zero for the calibration of audiometric equipment--Part 7:Reference threshold of hearing under free-field and diffuse-field listening conditions GB/T 17696-1999 Acoustics--Audiometric test methods--Part 3:Speech audiometry GB/T 17249.1-1998 Acoustics--Guidelines for the design of low-noise workplaces--Noise control strategies GB/T 17250-1998 Acoustics--Measurement of noise emitted by passenger cars under conditions representative of urban driving GB/T 14366-1993 Acoustics--Determination ofoccupational noise exposure and estimation of noise-induced hearing impairment
Transparency note: The application summary and key sentences on this page were automatically generated by AI from the standard's original text. This content has not been human-verified and should not be used for compliance or regulatory purposes. Always refer to the official standard document from the issuing authority.