This standard specifies the reference equivalent threshold sound pressure levels (RETSPLs) of pure tones in the frequency range of 125 Hz to 8 000 Hz, applicable to the calibration of air conduction audiometric equipment equipped with a special type of over-ear headphones (SENNHEISER HDA 200). GB/T 4854.8-2007 Reference zero level for acoustic calibration of audiometric equipment Part 8: Reference equivalent threshold sound pressure levels of pure tones for over-ear headphones GB/T4854.8-2007 Standard download decompression password: www.bzxz.net
This standard specifies the reference equivalent threshold sound pressure levels (RETSPLs) of pure tones in the frequency range of 125 Hz to 8 000 Hz, applicable to the calibration of air conduction audiometric equipment equipped with a special type of over-ear headphones (SENNHEISER HDA 200).
GB/T4854 "Reference zero level for acoustic calibration of audiometric equipment" includes 8 parts:
--- Part 1: Reference equivalent threshold sound pressure level of pure tone for on-ear headphones (GB/T4854.1);
--- Part 2: Reference equivalent threshold sound pressure level of pure tone for insert earphones (GB/T16402);
--- Part 3: Reference equivalent threshold sound pressure level of pure tone for bone vibrator (GB/T4854.3);
--- Part 4: Reference level of narrow-band masking noise (GB/T4854.4);
--- Part 5: Reference equivalent threshold sound pressure level of pure tone in the frequency range of 8kHz~16kHz (GB/T4854.5);
--- Part 6: Reference equivalent threshold sound pressure level of short-duration test signal;
---Part 7: Reference hearing thresholds for free-field and diffuse-field audiometry (GB/T4854.7);
---Part 8: Reference equivalent threshold sound pressure level of pure tone for over-ear headphones (GB/T4854.8). This part
is Part 8 of GB/T4854.
This part is equivalent to ISO389-8:2004 "Reference zero level for acoustic calibration of audiometric equipment Part 8: Reference equivalent threshold sound pressure level of pure tone for over-ear headphones" (English version).
This part makes editorial changes to the international standards that are equivalent to the international standards.
Appendices A, B and C of this part are informative appendices.
This part is proposed by the Chinese Academy of Sciences.
This part is under the jurisdiction of the National Technical Committee for Acoustics Standardization (SAC/TC17).
The drafting units of this part are: Institute of Otolaryngology, PLA General Hospital, Institute of Acoustics, Chinese Academy of Sciences.
The main drafters of this part are: Chen Hongwen, Wu Wenming, Yu Liming, Zhang Ruwei, Dai Genhua.
The clauses in the following documents become the clauses of this part through reference in this part of GB/T 4854. For all dated referenced documents, all subsequent amendments (excluding errata) or revisions are not applicable to this part. However, the parties to the agreement based on this part are encouraged to study whether the latest versions of these documents can be used. For all undated referenced documents, the latest versions are applicable to this part.
GB/T4854.1 Acoustics Reference zero level for calibration of audiometric equipment Part 1: Reference equivalent threshold sound pressure level of pure tones for supra-aural earphones (GB/T4854.1-2004, ISO389-1:1998, IDT)
GB/T7584.1 Acoustics Hearing protectors Part 1: Subjective method for measuring sound attenuation (GB/T 7584.1-2004, ISO4869-1:1990, IDT)
GB/T7341.2 Audiometer Part 2: Speech audiometric equipment (GB/T7341.2-1998, idtIEC60645?2:1993)
IEC60318-1:1998 Electroacoustics Human head and ear simulator Part 1: Ear simulator for calibration of supra-aural earphones
IEC60318-2:1998 Electroacoustics Human head and ear simulators Part 2: Temporary acoustic coupling chambers for calibration of audiometer earphones in the extended high frequency range
Foreword I
Introduction II
1 Scope 1
2 Normative references 1
3 Terms and definitions 1
4 Technical requirements 1
Appendix A (Informative) Notes on deriving the reference equivalent threshold sound pressure level of HDA200 type circumferential audiometry headphones 3
Appendix B (Informative) Acoustic attenuation of HDA200 type headphones 4
Appendix C (Informative) Correction value for the free-field equivalent output of HDA200 type circumferential audiometry headphones 5
References 6

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