{"id":229305,"date":"2024-10-19T14:55:01","date_gmt":"2024-10-19T14:55:01","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/bs-en-iec-60268-212018\/"},"modified":"2024-10-25T09:03:14","modified_gmt":"2024-10-25T09:03:14","slug":"bs-en-iec-60268-212018","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/bsi\/bs-en-iec-60268-212018\/","title":{"rendered":"BS EN IEC 60268-21:2018"},"content":{"rendered":"

This part of IEC 60268 specifies an acoustical measurement method that applies to electroacoustical transducers and passive and active sound systems, such as loudspeakers, TV-sets, multi-media devices, personal portable audio devices, automotive sound systems and professional equipment. The device under test (DUT) can be comprised of electrical components performing analogue and digital signal processing prior to the passive actuators performing a transduction of the electrical input into an acoustical output signal. This document describes only physical measurements that assess the transfer behaviour of the DUT between an arbitrary analogue or digital input signal and the acoustical output at any point in the near and far field of the system. This includes operating the DUT in both the small and large signal domains. The influence of the acoustical boundary conditions of the target application (e.g. car interior) can also be considered in the physical evaluation of the sound system. This document does not assess the perception and cognitive evaluation of the reproduced sound and the impact of perceived sound quality.<\/p>\n

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NOTE Some measurement methods defined in this document can be applied to headphones, headsets, earphones and earsets in accordance with [1]1<\/sup>. This document does not apply to microphones and other sensors. This document does not require access to the state variables (voltage, current) at the electrical terminals of the transducer. Sensitivity, electric input power and other characteristics based on the electrical impedance will be described in a separate future standard document, IEC 60268-22, dedicated to electrical and mechanical measurements.<\/p>\n<\/blockquote>\n

PDF Catalog<\/h4>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
PDF Pages<\/th>\nPDF Title<\/th>\n<\/tr>\n
2<\/td>\nundefined <\/td>\n<\/tr>\n
5<\/td>\nAnnex ZA(normative)Normative references to international publicationswith their corresponding European publications <\/td>\n<\/tr>\n
7<\/td>\nCONTENTS <\/td>\n<\/tr>\n
13<\/td>\nFOREWORD <\/td>\n<\/tr>\n
15<\/td>\nINTRODUCTION <\/td>\n<\/tr>\n
16<\/td>\n1 Scope
2 Normative references <\/td>\n<\/tr>\n
17<\/td>\n3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
3.2 Abbreviated terms
4 Type description
5 Physical characteristics
5.1 Marking of terminals and controls
5.2 Dimensions
5.3 Mass <\/td>\n<\/tr>\n
18<\/td>\n5.4 Connectors and cable assemblies
6 Design data
7 Conditions
7.1 Rated conditions
7.2 Climatic conditions
7.3 Normal measuring conditions <\/td>\n<\/tr>\n
19<\/td>\n8 Test signals
8.1 General
8.2 Sinusoidal chirp <\/td>\n<\/tr>\n
20<\/td>\n8.3 Steady-state single-tone signal
8.4 Steady-state two-tone signal
8.5 Sparse multi-tone complex <\/td>\n<\/tr>\n
21<\/td>\n8.6 Broadband noise signal
8.7 Narrow-band noise signal
8.8 Hann-burst signal <\/td>\n<\/tr>\n
22<\/td>\n8.9 Impulsive signal
9 Acoustical environment
9.1 General
9.2 Free-field conditions
9.3 Half-space, free-field conditions
9.4 Simulated free-field conditions
9.5 Half-space simulated free-field conditions <\/td>\n<\/tr>\n
23<\/td>\n9.6 Diffuse sound field conditions
9.7 Target application conditions
10 Positioning of the DUT
10.1 Rated geometrical conditions
10.1.1 General
10.1.2 Reference plane and normal vector
10.1.3 Reference point
Figures
Figure 1 \u2013 Rated conditions used to describe the position ofthe DUT in the coordinate system <\/td>\n<\/tr>\n
24<\/td>\n10.1.4 Reference axis
10.1.5 Orientation vector
10.1.6 Evaluation point
10.1.7 Evaluation distance
Figure 2 \u2013 Recommended position and orientation of the DUT <\/td>\n<\/tr>\n
25<\/td>\n10.2 Measuring distance between DUT and microphone
10.2.2 Near-field conditions
10.2.3 Diffuse field conditions <\/td>\n<\/tr>\n
26<\/td>\n10.2.4 Target application condition
11 Measurement equipment and test results
12 Accuracy of the acoustical measurement
12.1 General
12.2 Measurement uncertainty <\/td>\n<\/tr>\n
27<\/td>\n13 Mounting of the DUT
13.1 Mounting and acoustic loading of drive units
13.2 Mounting and acoustic loading of an electro-acoustic system <\/td>\n<\/tr>\n
28<\/td>\n14 Preconditioning
15 Rated ambient conditions
15.1 Temperature ranges
15.1.1 Performance limited temperature range
15.1.2 Damage limited temperature range
15.2 Humidity ranges
15.2.1 Relative humidity range
15.2.2 Damage limited humidity range
16 Rated frequency range
17 Input signal
17.1 Rated maximum input value
17.1.1 Condition to be specified <\/td>\n<\/tr>\n
29<\/td>\n17.1.2 Direct measurement <\/td>\n<\/tr>\n
30<\/td>\n17.1.3 Indirect measurement based on SPLmax
17.2 Maximum input level <\/td>\n<\/tr>\n
31<\/td>\n18 Sound-pressure output
18.1 Rated maximum sound pressure
18.1.1 Conditions to be specified
18.1.2 Direct measurement <\/td>\n<\/tr>\n
32<\/td>\n18.1.3 Indirect measurement based on maximum input value
18.2 Rated maximum sound-pressure level
18.3 Short term maximum sound pressure level
18.3.1 Conditions to be specified <\/td>\n<\/tr>\n
33<\/td>\n18.3.2 Method of measurement
18.4 Long term maximum sound pressure level
18.4.1 Conditions to be specified <\/td>\n<\/tr>\n
34<\/td>\n18.4.2 Method of measurement
18.5 Sound pressure in a stated frequency band
18.5.1 Condition to be specified
18.5.2 Method of measurement <\/td>\n<\/tr>\n
35<\/td>\n18.6 Sound-pressure level in a stated frequency band
18.7 Mean sound-pressure in a stated frequency range
18.7.1 Condition to be specified
18.7.2 Method of measurement
18.8 Mean sound-pressure level in a stated frequency range
19 Frequency response of the fundamental component
19.1 Transfer function
19.1.1 Conditions to be specified
19.1.2 Method of measurements <\/td>\n<\/tr>\n
37<\/td>\n19.2 SPL frequency response
19.2.1 Conditions to be specified
19.2.2 Method of measurement <\/td>\n<\/tr>\n
38<\/td>\n19.3 Time-varying amplitude compression of the fundamental component
19.3.1 General
19.3.2 Method of measurement
19.4 Amplitude compression at maximum input
19.4.1 Short term amplitude compression
19.4.2 Method of measurement <\/td>\n<\/tr>\n
39<\/td>\n19.4.3 Long-term amplitude compression
19.4.4 Method of measurement
19.5 Corrections based on a free-field reference measurement
19.5.1 General
19.5.2 Correction of the measured sound pressure signal <\/td>\n<\/tr>\n
40<\/td>\n19.5.3 Correction of the amplitude response <\/td>\n<\/tr>\n
41<\/td>\n19.6 Effective frequency range
19.6.1 Conditions to be specified
19.6.2 Method of measurement
19.7 Internal latency
19.7.1 Conditions to be specified
19.7.2 Methods of measurement <\/td>\n<\/tr>\n
42<\/td>\n20 Directional characteristics
20.1 General
20.2 Direct sound field in 3D space
20.2.1 Directional transfer function
20.2.2 Extrapolated far-field data <\/td>\n<\/tr>\n
43<\/td>\n20.2.3 Parameters of the holographic sound field expansion <\/td>\n<\/tr>\n
44<\/td>\n20.2.4 Extrapolated near-field data
20.3 Directional far field characteristics
20.3.1 Directional factor
Figure 3 \u2013 Valid region of expansion of the sound pressure p(r)at the observation point r at the distance r > a <\/td>\n<\/tr>\n
46<\/td>\n20.3.2 Directional gain
20.3.3 Directivity factor
20.3.4 Directivity index <\/td>\n<\/tr>\n
47<\/td>\n20.4 Acoustic output power
20.4.1 Conditions to be specified
20.4.2 Methods of measurement <\/td>\n<\/tr>\n
49<\/td>\n20.5 Sound power level
20.6 Mean acoustic output power in a frequency band
20.6.1 Conditions to be specified
20.6.2 Method of measurement
20.7 Radiation angle
20.7.1 Conditions to be specified
20.7.2 Method of measurement <\/td>\n<\/tr>\n
50<\/td>\n20.8 Coverage angle or angles
20.8.1 Conditions to be specified
20.8.2 Method of measurement
20.9 Mean sound pressure level in an acoustical zone
20.9.1 General
20.9.2 Method of measurement <\/td>\n<\/tr>\n
51<\/td>\n21 Harmonic distortion
21.1 General
21.2 Nth-order harmonic component
21.2.1 Conditions to be specified
21.2.2 Method of measurement <\/td>\n<\/tr>\n
52<\/td>\n21.3 Total harmonic components
21.3.1 Conditions to be specified
21.3.2 Method of measurement
21.4 Total harmonic distortion
21.4.1 Conditions to be specified
21.4.2 Method of measurement <\/td>\n<\/tr>\n
53<\/td>\n21.5 Higher-order harmonic distortion
21.5.1 Conditions to be specified
21.5.2 Method of measurement <\/td>\n<\/tr>\n
54<\/td>\n21.6 Maximum sound pressure level limited by total harmonic distortion
21.6.1 Conditions to be specified
21.6.2 Method of measurement <\/td>\n<\/tr>\n
55<\/td>\n21.7 Nth-order equivalent input harmonic distortion component
21.7.1 Conditions to be specified
21.7.2 Method of measurement <\/td>\n<\/tr>\n
56<\/td>\n21.8 Equivalent input total harmonic distortion
21.8.1 Conditions to be specified
21.8.2 Method of measurement <\/td>\n<\/tr>\n
57<\/td>\n22 Two-tone distortion
22.1 Variation of excitation frequencies
22.2 Modulation distortion
22.2.1 Conditions to be specified
22.2.2 Method of measurement <\/td>\n<\/tr>\n
58<\/td>\n22.3 Amplitude modulation distortion
22.3.1 Conditions to be specified <\/td>\n<\/tr>\n
59<\/td>\n22.3.2 Method of measurement
23 Multi-tone distortion
23.1 Conditions to be specified <\/td>\n<\/tr>\n
60<\/td>\n23.2 Method of measurement
24 Impulsive distortion
24.1 Impulsive distortion level
24.1.1 Conditions to be specified
Figure 4 \u2013 Measurement of the distortion generated by a multi-tone stimulus <\/td>\n<\/tr>\n
61<\/td>\n24.1.2 Method of measurement
24.2 Maximum impulsive distortion ratio
24.2.1 Conditions to be specified
24.2.2 Method of measurement
Figure 5 \u2013 Measurement of impulsive distortion <\/td>\n<\/tr>\n
62<\/td>\n24.3 Mean impulsive distortion level
24.3.1 Conditions to be specified
24.3.2 Method of measurement
24.4 Crest factor of impulsive distortion
24.4.1 Conditions to be specified
24.4.2 Method of measurement <\/td>\n<\/tr>\n
63<\/td>\n25 Stray magnetic fields
25.1 General
25.2 Static component
25.2.1 Characteristic to be specified
25.2.2 Method of measurement <\/td>\n<\/tr>\n
64<\/td>\n25.3 Dynamic components
25.3.1 Characteristics to be specified
25.3.2 Method of measurement <\/td>\n<\/tr>\n
65<\/td>\nAnnex A (informative)Uncertainty analysis
Figure A.1 \u2013 Relationship between tolerance limits, corresponding acceptanceintervals and the maximum permitted uncertainty of measurement, UMAX. <\/td>\n<\/tr>\n
66<\/td>\nTables
Table A.1 \u2013 Example uncertainty budget \u2013 acoustical loudspeaker evaluation <\/td>\n<\/tr>\n
67<\/td>\nAnnex B (normative)Transducer mounting
B.1 Standard baffle
Figure B.1 \u2013 Standard baffle, dimensions <\/td>\n<\/tr>\n
68<\/td>\nFigure B.2 \u2013 Standard baffle with chamfer
Figure B.3 \u2013 Standard baffle with sub-baffle <\/td>\n<\/tr>\n
69<\/td>\nB.2 Standard measuring enclosures
B.2.1 General
B.2.2 Type A
B.2.3 Type B
Figure B.4 \u2013 Standard measuring enclosure type A (net volume is about 600 l) <\/td>\n<\/tr>\n
70<\/td>\nFigure B.5 \u2013 Standard measuring enclosure type B (net volume is about 450 l) <\/td>\n<\/tr>\n
71<\/td>\nAnnex C (normative)Simulated programme signal
Figure C.1 \u2013 Block diagram of test setup for generating the simulated noise signal used for testing passive loudspeaker systems comprising a network filter <\/td>\n<\/tr>\n
72<\/td>\nTable C.1 \u2013 Power spectrum of simulated programme signal in 1\/3 octave bandsrated <\/td>\n<\/tr>\n
73<\/td>\nAnnex D (informative)Rating the maximum input and output values <\/td>\n<\/tr>\n
75<\/td>\nAnnex E (informative)Spherical wave expansion
E.1 Coefficients of spherical wave expansion
E.2 Directional factor <\/td>\n<\/tr>\n
76<\/td>\nE.3 Directivity factor
E.4 Acoustic output power <\/td>\n<\/tr>\n
77<\/td>\nAnnex F (informative)Non-linearity
F.1 Equivalent harmonic input distortion
F.2 Two-tone intermodulation
Figure F.1 \u2013 Signal flow chart of the electro-acoustical system <\/td>\n<\/tr>\n
78<\/td>\nF.3 Signal distortion generated in audio systems
Figure F.2 \u2013 Variation of the frequencies of the two-tone stimulusin the intermodulation measurement
Figure F.3 \u2013 Generation of the signal distortion in audio systems <\/td>\n<\/tr>\n
80<\/td>\nAnnex G (informative)Stray magnetic field
Figure G.1 \u2013 Measuring apparatus for stray magnetic field <\/td>\n<\/tr>\n
81<\/td>\nBibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

Sound system equipment – Acoustical (output-based) measurements<\/b><\/p>\n\n\n\n\n
Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
BSI<\/b><\/a><\/td>\n2019<\/td>\n84<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":229306,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[637,2641],"product_tag":[],"class_list":{"0":"post-229305","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-33-160-01","7":"product_cat-bsi","9":"first","10":"instock","11":"sold-individually","12":"shipping-taxable","13":"purchasable","14":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/229305","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/229306"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=229305"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=229305"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=229305"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}