Microspeakers

IEC 63034:2020 specifies the characteristics of microspeakers as well as the relevant test methods on microspeakers using steady-state sinusoidal signals, sinusoidal chirp, multi-tone or noise. The main characteristics include, but are not limited to, impedance, displacement, amplitude frequency response, distortion, and power handling.

Micro-haut-parleurs

L'IEC 63034:2020 spécifie les caractéristiques des micro-haut-parleurs, ainsi que les méthodes d'essai pertinentes des micro-haut-parleurs à l'aide de signaux sinusoïdaux en régime permanent, d'une modulation de fréquence pulsée sinusoïdale, de signaux à fréquences multiples ou de bruit. Les principales caractéristiques incluent l'impédance, le déplacement, la réponse en fréquence/amplitude, la distorsion, et la gestion de puissance, cette liste n'étant pas exhaustive.

General Information

Status
Published
Publication Date
23-Jun-2020
Current Stage
PPUB - Publication issued
Completion Date
24-Jun-2020
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IEC 63034
Edition 1.0 2020-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Microspeakers
Micro-haut-parleurs
IEC 63034:2020-06(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 63034
Edition 1.0 2020-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Microspeakers
Micro-haut-parleurs
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.160.50 ISBN 978-2-8322-8312-7

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 63034:2020  IEC 2020
CONTENTS

FOREWORD ........................................................................................................................... 6

1 Scope .............................................................................................................................. 8

2 Normative references ...................................................................................................... 8

3 Terms, definitions and abbreviated terms ........................................................................ 8

3.1 Terms and definitions .............................................................................................. 8

3.2 Abbreviated terms ................................................................................................... 8

4 Conditions of measurement ............................................................................................. 9

4.1 Rated measuring conditions .................................................................................... 9

4.2 Climatic conditions .................................................................................................. 9

4.3 Normal measuring conditions .................................................................................. 9

5 Acoustical environment .................................................................................................. 10

5.1 General ................................................................................................................. 10

5.2 Free-field conditions ............................................................................................. 10

5.3 Half-space free-field conditions ............................................................................. 10

5.4 Simulated free-field conditions .............................................................................. 10

5.5 Half-space simulated free-field conditions ............................................................. 10

6 Mounting of the microspeaker ........................................................................................ 10

6.1 Mounting and acoustic loading of microspeaker units ............................................ 10

6.2 Mounting and acoustic loading of microspeaker systems ...................................... 11

6.3 Standard micro-baffle ............................................................................................ 11

6.4 Measuring plane wave tube................................................................................... 12

7 Positioning of microspeaker and measuring microphone ................................................ 13

7.1 Positioning of the microspeaker ............................................................................ 13

7.1.1 Rated geometrical condition .......................................................................... 13

7.1.2 Reference plane ............................................................................................ 13

7.1.3 Reference point ............................................................................................. 13

7.1.4 Normal vector ................................................................................................ 13

7.1.5 Polar vector ................................................................................................... 14

7.2 Measuring distance under free-field and half-space free-field conditions ............... 14

7.2.1 Far-field condition .......................................................................................... 14

7.2.2 Single microspeaker unit (transducer) ............................................................ 14

7.2.3 Multi-unit microspeaker systems .................................................................... 14

7.3 Positioning of microspeaker and microphone in simulated free-field and half-

space free-field conditions .................................................................................... 14

8 Measuring equipment .................................................................................................... 15

9 Accuracy of the measurement........................................................................................ 15

9.1 General ................................................................................................................. 15

9.2 Unwanted acoustic and electrical noise ................................................................. 15

9.3 Accuracy of the mounting ...................................................................................... 15

9.4 Accuracy of the measuring equipment ................................................................... 15

9.5 Accuracy of acoustic environment ......................................................................... 15

10 Marking of terminals and controls .................................................................................. 15

10.1 General ................................................................................................................. 15

10.2 Positive terminal ................................................................................................... 16

10.2.1 Characteristic to be specified ......................................................................... 16

10.2.2 Marking ......................................................................................................... 16

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IEC 63034:2020  IEC 2020 – 3 –

10.2.3 Method of testing ........................................................................................... 16

11 Test signals ................................................................................................................... 16

11.1 General ................................................................................................................. 16

11.2 Steady-state sinusoidal signal ............................................................................... 16

11.3 Sinusoidal chirp signal .......................................................................................... 16

11.4 Discrete multi-tone sinusoidal signal ..................................................................... 17

11.5 Broadband noise signal ......................................................................................... 18

11.6 Narrow-band noise signal ..................................................................................... 18

12 Preconditioning .............................................................................................................. 18

12.1 Acclimatization ...................................................................................................... 18

12.2 Pre-loading ........................................................................................................... 18

13 Electrical input impedance ............................................................................................. 19

13.1 Electrical input impedance curve ........................................................................... 19

13.1.1 Characteristics to be specified ....................................................................... 19

13.1.2 Method of measurement ................................................................................ 19

13.2 Rated impedance .................................................................................................. 19

14 Small signal parameters of the microspeaker ................................................................. 19

14.1 General ................................................................................................................. 19

14.2 Characteristics to be specified .............................................................................. 20

14.2.1 Resonance frequency f ................................................................................ 20

14.2.2 DC resistance of driver voice coil R ............................................................. 20

14.2.3 Voice coil inductance L ................................................................................ 20

14.2.4 Total Q-factor Q ........................................................................................... 20

14.2.5 Electrical Q-factor Q ................................................................................... 20

14.2.6 Mechanical Q-factor Q ............................................................................... 20

14.2.7 Mechanical compliance C ........................................................................... 20

14.2.8 Moving mass M .......................................................................................... 21

14.2.9 Mechanical resistance R ............................................................................ 21

14.2.10 Force factor Bl ............................................................................................... 21

14.2.11 Equivalent air volume of a microspeaker unit compliance V ........................ 21

14.2.12 Effective radiation area S ............................................................................. 21

14.3 Method of measurement ....................................................................................... 21

14.3.1 General ......................................................................................................... 21

14.3.2 Laser ranging method .................................................................................... 21

14.3.3 Added volume method ................................................................................... 23

14.3.4 Added mass method ...................................................................................... 25

15 Displacement ................................................................................................................. 25

15.1 Displacement curve .............................................................................................. 25

15.1.1 Characteristics to be specified ....................................................................... 25

15.1.2 Method of measurement ................................................................................ 25

15.2 DC component X ................................................................................................ 26

15.2.1 Characteristics to be specified ....................................................................... 26

15.2.2 Method of measurement ................................................................................ 27

15.3 Distortion limited peak displacement X ................................................................ 27

15.3.1 Characteristics to be specified ....................................................................... 27

15.3.2 Method of measurement ................................................................................ 27

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– 4 – IEC 63034:2020  IEC 2020

15.4 Sinusoidal peak displacement X .......................................................................... 27

16 Amplitude frequency response ....................................................................................... 28

16.1 Rated frequency range .......................................................................................... 28

16.2 Frequency response ............................................................................................. 28

16.2.1 Characteristic to be specified ......................................................................... 28

16.2.2 Method of measurement ................................................................................ 28

16.3 Mean sound pressure in a stated frequency band ................................................. 28

16.3.1 Characteristics to be specified ....................................................................... 28

16.3.2 Method of measurement ................................................................................ 28

16.4 Effective frequency range ..................................................................................... 29

16.4.1 Characteristics to be specified ....................................................................... 29

16.4.2 Method of measurement ................................................................................ 29

17 Amplitude non-linearity .................................................................................................. 29

17.1 Total harmonic distortion (THD) ............................................................................ 29

17.1.1 Characteristic to be specified ......................................................................... 29

17.1.2 Method of measurement for input voltages up to the rated sinusoidal

voltage .......................................................................................................... 29

17.2 Harmonic distortion of the n order ....................................................................... 30

17.2.1 Characteristic to be specified ......................................................................... 30

17.2.2 Method of measurement for input voltages up to the rated sinusoidal

voltage .......................................................................................................... 30

17.3 Total higher-order harmonic distortion components (HOHD) ................................. 30

17.3.1 Characteristic to be specified ......................................................................... 30

17.3.2 Method of measurement for input voltages up to the rated sinusoidal

voltage .......................................................................................................... 30

17.4 Modulation distortion of the n order (where n = 2 or n = 3) .................................. 31

17.4.1 Characteristic to be specified ......................................................................... 31

17.4.2 Method of measurement ................................................................................ 31

18 Listening test ................................................................................................................. 32

18.1 Listening test for normal operation ........................................................................ 32

18.2 Listening test for irregular distortion ...................................................................... 32

19 Input voltage/Electrical power ........................................................................................ 33

19.1 Rated noise voltage/power .................................................................................... 33

19.1.1 Characteristic to be specified ......................................................................... 33

19.1.2 Method of measurement ................................................................................ 33

19.2 Short-term maximum input voltage/power ............................................................. 34

19.2.1 Characteristic to be specified ......................................................................... 34

19.2.2 Method of measurement ................................................................................ 34

19.2.3 Protective devices ......................................................................................... 34

19.3 Long-term maximum input voltage/power .............................................................. 35

19.3.1 Characteristic to be specified ......................................................................... 35

19.3.2 Method of measurement ................................................................................ 35

19.3.3 Protective devices ......................................................................................... 35

19.4 Rated sinusoidal voltage/power ............................................................................ 35

19.4.1 Characteristic to be specified ......................................................................... 35

19.4.2 Method of measurement ................................................................................ 35

20 Environmental testing .................................................................................................... 36

20.1 Temperature ranges .............................................................................................. 36

20.1.1 Performance-limited temperature range – Characteristic to be specified ........ 36

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IEC 63034:2020  IEC 2020 – 5 –

20.1.2 Damage-limited temperature range – Characteristic to be specified ............... 36

20.2 Humidity ranges .................................................................................................... 36

20.2.1 Relative humidity range – Characteristic to be specified ................................ 36

20.2.2 Damage-limited humidity range – Characteristic to be specified ..................... 36

20.3 Cold storage ......................................................................................................... 36

20.3.1 Characteristic to be specified ......................................................................... 36

20.3.2 Method of measurement ................................................................................ 36

20.4 Cold usage ........................................................................................................... 36

20.4.1 Characteristic to be specified ......................................................................... 36

20.4.2 Method of measurement ................................................................................ 36

20.5 Dry heat storage ................................................................................................... 37

20.5.1 Characteristic to be specified ......................................................................... 37

20.5.2 Method of measurement ................................................................................ 37

20.6 Dry heat usage ..................................................................................................... 37

20.6.1 Characteristic to be specified ......................................................................... 37

20.6.2 Method of measurement ................................................................................ 37

20.7 Thermal shock (rapid change of temperature with prescribed time of

transition) ............................................................................................................. 38

20.7.1 Characteristic to be specified ......................................................................... 38

20.7.2 Method of measurement ................................................................................ 38

20.8 Steady damp heat ................................................................................................. 38

20.8.1 Characteristic to be specified ......................................................................... 38

20.8.2 Method of measurement ................................................................................ 38

21 Stray magnetic fields ..................................................................................................... 39

21.1 General ................................................................................................................. 39

21.2 Static components ................................................................................................ 39

21.2.1 Characteristic to be specified ......................................................................... 39

21.2.2 Method of measurement ................................................................................ 39

21.3 Dynamic components ............................................................................................ 40

21.3.1 Characteristic to be specified ......................................................................... 40

21.3.2 Method of measurement ................................................................................ 40

22 Physical characteristics ................................................................................................. 41

22.1 Dimensions ........................................................................................................... 41

22.2 Weight .................................................................................................................. 41

23 Design data ................................................................................................................... 41

Bibliography .......................................................................................................................... 42

Figure 1 – Standard micro-baffle ........................................................................................... 11

Figure 2 – Standard micro-baffle with sub-baffle ................................................................... 12

Figure 3 – Plane wave tube .................................................................................................. 12

Figure 4 – Rated geometrical conditions of the microspeaker................................................ 13

Figure 5 – Electrical input impedance curve of the microspeaker .......................................... 23

Figure 6 – Peak and bottom values of displacement ............................................................. 26

Figure 7 – Displacement curve .............................................................................................. 26

Figure 8 – DC component of displacement ............................................................................ 27

Figure 9 – Block diagram of test setup .................................................................................. 33

Figure 10 – Measuring apparatus for stray magnetic field ..................................................... 39

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– 6 – IEC 63034:2020  IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MICROSPEAKERS
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