GB/T 4854.4-1999Acoustics. Reference zero for the calibration of audiometric equipment. Part 4: Reference levels for narrow-band masking noise (English PDF)
Also coversGBT4854.4-1999
This is a limited preview
Buy now to download the full PDF (13 pages)
Need quotation for your management?
Get a formal quotation for GB/T 4854.4-1999 in 30 minutes.
Issued by
The State Bureau of Quality and Technical Supervision
Level / Type
National · Recommended
Issue date
March 8, 1999
Implementation date
September 1, 1999
Scope
GB/T 4854.4-1999 (Acoustics. Reference zero for the calibration of audiometric equipment. Part 4: Reference levels for narrow-band masking noise) is available as an English-translated PDF.
GB/T 4854.4-1999 is the Chinese standard "Acoustics. Reference zero for the calibration of audiometric equipment. Part 4: Reference levels for narrow-band masking noise".
Its scope clause reads: This Standard specifies reference levels for narrow-band masking noise presented by air conduction from an earphone in pure-tone audiometry.
The data are given in terms of levels to be added to the reference equivalent threshold sound pressure levels for the corresponding pure-tone frequencies as specified in GB/T 4854.1 or GB/T 16402, respectively, when the masking earphone is placed on the appropriate acoustic coupler, ear simulator or artificial ear.
Data are given for noise bandwidths of one-third and one-half octaves. NOTE: some notes on the derivation of the reference levels are given in Annex A.
Found what you need?
Document preview — GB/T 4854.4-1999
National Standard of the People's Republic of China
- ICS
- 17.140.01
- Classification
- A 42
Issued by: The State Bureau of Quality and Technical Supervision
Contents
- Foreword3
- ISO Foreword5
- Introduction6
- 1 Scope7
- 2 Normative References7
- 3 Definitions8
- 4 Specifications9
- Annex A (informative) Notes on the Derivation of the Reference Levels11
- Annex B (informative) Bibliography13
1 Scope
This Standard specifies reference levels for narrow-band masking noise presented by air conduction from an earphone in pure-tone audiometry. The data are given in terms of levels to be added to the reference equivalent threshold sound pressure levels for the corresponding pure-tone frequencies as specified in GB/T 4854.1 or GB/T 16402, respectively, when the masking earphone is placed on the appropriate acoustic coupler, ear simulator or artificial ear.
Data are given for noise bandwidths of one-third and one-half octaves.
NOTE: some notes on the derivation of the reference levels are given in Annex A.
2 Normative References
The following standards contain provisions which, through reference in this text, constitute provisions of this Standard. At the time of publication, the editions indicated where valid. All standards are subject to revision, and parties to agreements based on this Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below.
GB/T 4854.1-1999 Acoustics - Reference Zero for the Calibration of Audiometric
Equipment - Part 1: Reference Equivalent Threshold Sound Pressure Levels for Pure
Tones and Supra-aural Earphones (eqv ISO 389-1:1991)
GB/T 7341.1-1998 Audiometers - Part 1: Pure-tone Audiometers (idt IEC 645-1:1992)
GB/T 7342-1987 IEC Provisional Reference Coupler for the Calibration of Earphones
Used in Audiometry (eqv IEC 303:1970)
GB/T 7614-1987 An Artificial Ear of Wide Band Type for the Calibration of Earphones
Used in Audiometry (eqv IEC 318:1970)
GB/T 16402-1996 Acoustics - Reference Equivalent Threshold Sound Pressure Levels for Pure Tones and Insert Earphones (eqv ISO 389-2:1994)
SJ/Z 9144-1987 IEC Reference Coupler for the Measurement of Hearing Aids Using
Earphones Coupled to the Ear by Means of Ear Inserts
GB/T 2829-2025 | DZ/T 0175-2014 | GB/T 6379.6-2009 | GB/T 4854.3-2022 | […]
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 13 pages — is available in the English PDF.
Referenced standards
Normative references
GB/T 4854.1-1999 · ISO 389 · GB/T 7341.1-1998 · IEC 645 · GB/T 7342-1987 · IEC 303 · GB/T 7614-1987 · IEC 318 · GB/T 16402-1996
How to Download GB/T 4854.4-1999
- 1
Add to cart
Click "Download PDF" on this page and choose "Buy this standard". You can add more standards before checkout.
- 2
Checkout
Enter your email and billing details. Payment is processed securely by Stripe (cards or bank transfer). Prefer bank details? Request a quotation (min. order $300).
- 3
Instant delivery (0–9 sec)
Delivery is automatic: within seconds of payment you'll receive an email with a secure download link. The link stays valid for 72 hours.
- 4
Invoice included
A tax invoice is attached to the confirmation email. Need a custom invoice? Contact us.
Related Standards
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 4854.7-2008 — 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 47006-2026 — Additive manufacturing - Quality grading and testing requirements for laser powder bed fusion metal parts
Secure payment via Stripe
Payments accepted
GB/T 4854.4-1999
$95.00