GB/T 4854.4-1999
Acoustics--Reference zero for the calibration of audiometric equipment--Part 4: Reference levels for narrow-band masking noise (English Version)
- Standard No.
- GB/T 4854.4-1999
- Language
- Chinese, Available in English version
- Release Date
- 1999
- Published By
- General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
- Latest
- GB/T 4854.4-1999
- Scope
- This standard specifies the reference level of narrow-band masking noise emitted by pure tone audiometer air conduction earphones. The reference level of narrow-band masking noise refers to the pure tone of each corresponding frequency specified in GB/T4854.1 or GB/T16402 when the masking earphone is placed on an appropriate acoustic coupling cavity, ear simulator or artificial ear The value at the reference equivalent threshold sound pressure level. This standard gives reference levels for 1/3 octave and 1/2 octave bandwidth masking noise. Note: A few notes on derived reference levels are given in Appendix A.
GB/T 4854.4-1999 history
- 1999 GB/T 4854.4-1999 Acoustics--Reference zero for the calibration of audiometric equipment--Part 4: Reference levels for narrow-band masking noise
GB/T 4854.4-1999 -All Parts
GB/T 4854.1-2004 Acoustics-Reference zero for the calibration of audiometric equipment-Part 1:Reference equivalent threshold sound pressure levels for pure tones and supra-aural earphones
GB/T 4854.3-2022 Acoustics—Reference zero for the calibration of audiometric equipment—Part 3：Reference equivalent threshold vibratory force levels for pure tones and bone vibrators
GB/T 4854.4-1999 Acoustics--Reference zero for the calibration of audiometric equipment--Part 4: Reference levels for narrow-band masking noise
GB/T 4854.5-2008 Acoustics.Reference zero for the calibration of audiometric equipment.Part 5:Reference equivalent threshold sound pressure levels for pure tones in the frequency range 8 kHz to 16 kHz
GB/T 4854.6-2014 Acoustics.Reference zero for the calibration of audiometric equipment.Part 6:Reference hearing threshold levels for test signals of short duration
GB/T 4854.7-2008 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 4854.8-2007 Acoustics.Reference zero for the calibration of audiometric equipment.Part 8: Reference equivaleng threshold sound pressure levels for pure tone and circumaural earphones
GB/T 4854.9-2016 Acoustics.Reference zero for the calibration of audiometric equipment.Part 9:Preferred test conditions for the determination of reference hearing threshold levels