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GB/T 35784-2017: Audio visual equipment -- Methods for the subjective assessment of small impairments in audio systems
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Audio visual equipment -- Methods for the subjective assessment of small impairments in audio systems
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GB/T 35784-2017
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Basic data | Standard ID | GB/T 35784-2017 (GB/T35784-2017) | | Description (Translated English) | Audio visual equipment -- Methods for the subjective assessment of small impairments in audio systems | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | M72 | | Classification of International Standard | 33.160.01 | | Word Count Estimation | 30,334 | | Date of Issue | 2017-12-29 | | Date of Implementation | 2018-07-01 | | Regulation (derived from) | National Standards Bulletin 2017 No. 32 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | GB/T 35784-2017: Audio visual equipment -- Methods for the subjective assessment of small impairments in audio systems
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Audio visual equipments - Methods for the subjective assessment of small impairments in audio systems
ICS 33.160.01
M72
National Standards of People's Republic of China
Audiovisual equipment audio system
Subjective evaluation of small injuries
(ITU-RBS.1116-3.2015, Methodsforthesubjectiveassessmentof
smalimpairmentsaudiosystems, MOD)
2017-12-29 Posted
2018-07-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
China National Standardization Administration released
Directory
Foreword Ⅲ
1 Scope 1
2 Normative references 1
3 Terms and definitions 1
4 test design 3
5 audition group choice 4
5.1 expert listener 4
5.2 Select the listener's standard 4
5.3 listening group size 4
6 test method 5
6.1 General 5
6.2 Familiar with or training phase 6
6.3 Rating Stage 6
7 attributes 6
7.1 Overview 6
7.2 Mono system 6
7.3 Two-channel stereo system 6
7.4 Multi-channel stereo system 7
7.5 Advanced Audio Coding System 7
8 program material 7
Playback device 8
9.1 Overview 8
9.2 Reference Monitor Speaker 9
9.3 Reference monitor headphones 10
10 listening conditions 10
10.1 Overview 10
10.2 Reference audiometry room 11
10.3 Reference sound field conditions 12
10.4 audible sound level 14
10.5 Listening Arrangements 15
11 Statistical Analysis 18
12 Statistical Analysis Results Report 19
12.1 Overview 19
12.2 Absolute rank 19
12.3 Difference level 19
12.4 Significance Level and Confidence Interval 19
Contents of the report 19
Appendix A (Normative) listener's professional competence level evaluation 21
Appendix B (Normative) Listeners late screening statistical methods 22
Appendix C (Informative) Listener Guide Example 24
References 26
Figure 1 part of the terms and definitions of the internal relations diagram 3
Figure 2 Relative to the average Tm reverberation time limit requirements 12
Figure 3 audio-visual room response curve tolerance limit 13
Figure 4 NR curve based on ISO R1996.1972, 1/3oct band background noise level defined noise rating curve 14
Figure 5 NR curve based on ISO R1996.1972, 1oct band background noise level defined noise rating curve 14
Fig. 6 Reference audiometry of loudspeaker M and permissible listening area of mono system 16
Figure 7 small damage stereo system using speakers L, R listening arrangements
Figure 8 Small Damage Multichannel Sound System Listening Arrangement Using L/C/R, LS/RS Loudspeakers 18
Figure B.1 before the t test to discard the data method 21
Table 1 five-point damage score table 5
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard uses redrafted law revision using ITU-RBS.1116-3.2015 "small subjective audio system damage assessment method."
This standard compared with ITU-RBS.1116-3.2015, the following structural adjustment.
--- Increasing the normative references chapter;
--- Adjusted ITU-RBS.1116-3.2015 appendix 4 "subjective evaluation. Glossary" adjusted to Chapter 3 of this standard;
--- Adjusting the suspension section in Chapter 6 of ITU-R BS.1116-3.2015 to "General";
--- Adjust the suspension section in Chapter 7 of ITU-R BS.1116-3.2015 to "Overview".
Based on the above structure adjustment, this standard from the beginning of Chapter 4, the chapter number for the ITU-RBS.1116-3.2015 reg number plus
2 composition. For example, 3.1 in the ITU-RBS.1116-3.2015 document, numbered 5.1 in this standard.
This standard compared with ITU-RBS.1116-3.2015, the technical differences are as follows.
--- Replaced ITU-R.BS1284.2003 with YD/T 2309-2011, Modification of International Documents;
--- Removed the first chapter of ITU-RBS.1116-3.2015, added the first chapter "range";
--- Increased small damage, anchor two terms.
This standard also made the following editorial changes.
--- Modify the standard name;
--- 3.10 description of the content adjusted to Note;
--- 10.4.1.1 Note adjusted to the text;
--- In accordance with the order of emergence in the standard text and Chinese standards for the preparation of rules, appendix appendix 1, 2, 3 is modified to Appendix B, with
Record A, Appendix C.
Please note that some aspects of this standard may involve patents. The issuing agencies of this standard should not bear the responsibility of identifying these patents.
This standard proposed by the Ministry of Industry and Information Technology of the People's Republic of China.
This standard by the National Audio, Video and Multimedia Systems and Equipment Standardization Technical Committee (SAC/TC242) centralized.
This standard was drafted by the Ministry of Industry and Information Technology Institute of Electronics Industry Standardization, national digital audio and video and multimedia product quality supervision
National inspection center.
The main drafters of this standard. Zhang Subing, Dong Guiguan, Yang Zhen.
Audiovisual equipment audio system
Subjective evaluation of small injuries
1 Scope
This standard specifies the subjective evaluation method of small damage to the audio system in audio-visual equipment.
This standard applies to the assessment of small damage to the audio system; its damage is small enough, without relying on the strict test conditions and appropriate
The statistical analysis is not enough to detect.
Note. This standard establishes a reference for other relevant standards that may introduce additional special conditions or relaxation conditions in the appendix.
This standard does not apply to larger and easily detectable damage to the audio system, if based on this standard will consume more time and effort and draw
The result is not more credible than a simple test.
2 Normative references
The following documents for the application of this document is essential. For dated references, only the dated version applies to this article
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
YD/T 2309-2011 Audio quality subjective test methods (ITU-R.BS1284.2003, MOD)
ITU-RBS.645 international sound program connection test signal and measurement (Testsignalsandmeteringtobeusedonin-
ternationalsoundprogrammeconnections)
Measurement of electro-acoustic parameters of ITU-RBS.708 studio monitors (Determinationoftheelectro-acousticalprop-
ertiesofstudiomonitorheadphones)
ITU-R BS.775 Multichannel stereo echo system with or without accompanying images
systemwithandwithoutaccompanyingpicture)
3 Terms and definitions
The following terms and definitions apply to this document. The relationship between some of the terms is illustrated in FIG. 1.
3.1
Small damage smalimpairments
Damage caused by the audio system; the damage is small enough not to be severely limited by the test conditions and appropriate statistical analysis is insufficient
Aware
3.2
Attribute
Perceptual characteristics in auditory activity according to given verbal or written rules.
3.3
Blind test blindtest
A test method in which the only source of information available to the listener is motivation.
3.4
Double-blind test doubleblindtest
A blind test method in which the listener does not have any uncontrollable interaction with the audiometry.
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