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Calibration Specification for Measuring Instruments for Overall Speech Characteristics of Intercom Systems
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Basic data
| Standard ID | JJF 1797-2020 (JJF1797-2020) |
| Description (Translated English) | Calibration Specification for Measuring Instruments for Overall Speech Characteristics of Intercom Systems |
| Sector / Industry | Metrology & Measurement Industry Standard |
| Classification of Chinese Standard | A59 |
| Classification of International Standard | 17.140 |
| Word Count Estimation | 20,231 |
| Date of Issue | 2020 |
| Date of Implementation | 2020-04-17 |
| Issuing agency(ies) | State Administration for Market Regulation |
JJF 1797-2020: Calibration Specification for Measuring Instruments for Overall Speech Characteristics of Intercom Systems
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
(Calibration specification for the whole-process voice characteristic measuring instrument of intercom system)
National Metrology Technical Specifications of the People's Republic of China
Calibration specification for the whole process voice characteristic measuring instrument of the intercom system
2020-01-17 released
2020-04-17 implementation
Issued by the State Administration for Market Regulation
Voice characteristic measurement of the intercom system
Instrument calibration specification
Focal point. National Technical Committee of Acoustics Measurement
Main drafting unit. Shanghai Institute of Metrology and Testing Technology
National Security Alarm System Product Quality Supervision and Inspection Center
(Shanghai)
China Institute of Metrology
Participated in the drafting. Shanghai Jinghui Electronic Equipment Minhang Co., Ltd.
East China Branch of China Academy of Information and Communications Technology
This specification entrusts the National Acoustics Metrology Technical Committee to be responsible for interpretation
The main drafters of this specification.
An Zhaoliang (Shanghai Institute of Metrology and Testing Technology)
Rong Ling [National Security and Alarm System Product Quality Supervision and Inspection Center
(Shanghai)]
Zhong Bo (China Institute of Metrology)
Participating drafters.
Zhou Ziwei (Shanghai Institute of Metrology and Testing Technology)
Hu Rong (Shanghai Jinghui Electronic Equipment Minhang Co., Ltd.)
Zhao Peng (East China Branch of China Academy of Information and Communications Technology)
Chen Wenwang (Shanghai Institute of Metrology and Testing Technology)
table of Contents
Introduction (Ⅱ)
1 scope (1)
2 Reference documents (1)
3 Terms and measurement units (1)
3.1 Full voice features (1)
3.2 Full-range loudness rating (1)
3.3 Mouth reference point (1)
4 Overview (2)
5 Measurement characteristics (2)
5.1 The sound pressure level at the reference point of the simulated mouth at the transmitter (2)
5.2 The deviation of the simulated voice at the sender from the standard voice (2)
5.3 Sound pressure level frequency response at the receiving end (2)
5.4 Sound pressure level linearity at the receiving end (2)
5.5 Frequency response of loudness level at the receiving end (2)
5.6 The receiving end loudness level is linear (3)
6 Calibration conditions (3)
6.1 Environmental conditions (3)
6.2 Measurement standards and other equipment (3)
7 Calibration items and calibration methods (3)
7.1 Calibration items (3)
7.2 Check before calibration (4)
7.3 Sound pressure level at the reference point of the simulated mouth at the transmitter (4)
7.4 The deviation of the simulated voice at the transmitter relative to the standard voice (5)
7.5 Frequency response of sound pressure level at receiving end (5)
7.6 Sound pressure level linearity at the receiving end (6)
7.7 Loudness level frequency response at the receiving end (6)
7.8 Linearity of loudness level at the receiving end (7)
8 Calibration result expression (7)
8.1 Calibration data processing (7)
8.2 Calibration certificate (7)
8.3 Evaluation of Uncertainty of Measurement Results (7)
9 Re-calibration interval (7)
Appendix A. Contents and recommended format of calibration certificate (8)
Appendix B Evaluation Example of Uncertainty of Measurement Results (12)
Introduction
This specification is compiled in accordance with the requirements and format of JJF 1071-2010 "Rules for the Compilation of National Metrology and Calibration Specifications".
This specification mainly refers to GB 31070.1-2014 ``Lou Apartment Intercom System Part 1.General Technical Requirements
Requirements", IEC 62820-1-1.2016 "Louyu Intercom System Part 1-1.System Requirements---General Rules"
(Buildingintercomsystems-Part 1-1.Systemrequirements-General)
The technical requirements for measuring instruments of the fixed value test, and JJG869-2002 "Telephone Electroacoustic Tester", ITU-T
P.501 "Test signal for telephone measurement" (Testsignalsforuseintelephonometry).
This specification is released for the first time.
Calibration specification for the whole process voice characteristic measuring instrument of the intercom system
1 Scope
This specification applies to the frequency range of 100Hz~8kHz, and is used for the whole process of evaluating the sound quality of intercom systems and other products.
Tone characteristic measuring instrument calibration.
2 Reference documents
This specification refers to the following documents.
JJG175-2015 working standard microphone (electrostatic exciter method)
JJG449-2014 Octave and Fractional Octave Filter
JJG869-2002 Telephone Electroacoustic Tester
JJG1019-2007 working standard microphone (coupling cavity comparison method)
JJF 1034-2005 Acoustic measurement terms and definitions
JJF 1147-2006 Calibration specification for acoustic characteristics of anechoic room and semi-anechoic room
JJF 1580-2016 Calibration Specification for Artificial Mouth
GB/T 3102.7 Acoustic quantities and units
GB/T 31070.1-2014 Building Intercom System Part 1.General Technical Requirements
IEC 62820-1-1.2016 Building Intercom System Part 1-1.System Requirements---General (Building
intercomsystems-Part 1-1.Systemrequirements-General)
ITU-TP.501 Test signal for telephone measurement (Testsignalsforuseintelephonometry)
For dated reference documents, only the dated version applies to this specification; for undated references
The latest version (including all amendments) is applicable to this specification.
3 Terms and units of measurement
This specification adopts the quantities and units specified in GB/T 3102.7.
The following terms and definitions defined by JJF 1034-2005 are applicable to this specification.
3.1 Overalspeechcharacteristic
The quality of the voice signal is maintained during the process of sending, spreading and receiving in the air.
3.2 Overall loudness rating overalloudnessrating
OLR
The loudness value from the reference point of the transmitting end mouth to the reference point of the receiving end ear.
Note. The unit of the overall loudness evaluation value is dB.
[GB 31070.1-2014, definition 3.1.6]
3.3 Mouthreferencepoint
MRP
a) The loudness rating is on the reference axis, 25mm from the point directly in front of the lip plane.
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