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.
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| PDF Pages | PDF Title |
|---|---|
| 2 | undefined |
| 5 | Annex ZA(normative)Normative references to international publicationswith their corresponding European publications |
| 6 | English CONTENTS |
| 10 | FOREWORD |
| 12 | 1 Scope 2 Normative references 3 Terms, definitions and abbreviated terms 3.1 Terms and definitions 3.2 Abbreviated terms |
| 13 | 4 Conditions of measurement 4.1 Rated measuring conditions 4.2 Climatic conditions 4.3 Normal measuring conditions |
| 14 | 5 Acoustical environment 5.1 General 5.2 Free-field conditions 5.3 Half-space free-field conditions 5.4 Simulated free-field conditions 5.5 Half-space simulated free-field conditions 6 Mounting of the microspeaker 6.1 Mounting and acoustic loading of microspeaker units |
| 15 | 6.2 Mounting and acoustic loading of microspeaker systems 6.3 Standard micro-baffle Figures Figure 1 – Standard micro-baffle |
| 16 | 6.4 Measuring plane wave tube Figure 2 – Standard micro-baffle with sub-baffle Figure 3 – Plane wave tube |
| 17 | 7 Positioning of microspeaker and measuring microphone 7.1 Positioning of the microspeaker 7.1.1 General 7.1.2 Rated geometrical condition 7.1.3 Reference plane 7.1.4 Reference point 7.1.5 Normal vector Figure 4 – Rated geometrical conditions of the microspeaker |
| 18 | 7.1.6 Polar vector 7.2 Measuring distance under free-field and half-space free-field conditions 7.2.1 Far-field condition 7.2.2 Single microspeaker unit (transducer) 7.2.3 Multi-unit microspeaker systems 7.3 Positioning of microspeaker and microphone in simulated free-field and half-space free-field conditions |
| 19 | 8 Measuring equipment 9 Accuracy of the measurement 9.1 General 9.2 Unwanted acoustic and electrical noise 9.3 Accuracy of the mounting 9.4 Accuracy of the measuring equipment 9.5 Accuracy of acoustic environment 10 Marking of terminals and controls 10.1 General |
| 20 | 10.2 Positive terminal 10.2.1 Characteristic to be specified 10.2.2 Marking 10.2.3 Method of testing 11 Test signals 11.1 General 11.2 Steady-state sinusoidal signal 11.3 Sinusoidal chirp signal |
| 21 | 11.4 Discrete multi-tone sinusoidal signal |
| 22 | 11.5 Broadband noise signal 11.6 Narrow-band noise signal 12 Preconditioning 12.1 Acclimatization 12.2 Pre-loading |
| 23 | 13 Electrical input impedance 13.1 Electrical input impedance curve 13.1.1 Characteristics to be specified 13.1.2 Method of measurement 13.2 Rated impedance 14 Small signal parameters of the microspeaker 14.1 General |
| 24 | 14.2 Characteristics to be specified 14.2.1 Resonance frequency fs 14.2.2 DC resistance of driver voice coil Rdc 14.2.3 Voice coil inductance Le 14.2.4 Total Q-factor Qts 14.2.5 Electrical Q-factor Qes 14.2.6 Mechanical Q-factor Qms 14.2.7 Mechanical compliance Cms |
| 25 | 14.2.8 Moving mass Mms 14.2.9 Mechanical resistance Rms 14.2.10 Force factor Bl 14.2.11 Equivalent air volume of a microspeaker unit compliance Vas 14.2.12 Effective radiation area SD 14.3 Method of measurement 14.3.1 General 14.3.2 Laser ranging method |
| 27 | 14.3.3 Added volume method Figure 5 – Electrical input impedance curve of the microspeaker |
| 29 | 14.3.4 Added mass method 15 Displacement 15.1 Displacement curve 15.1.1 Characteristics to be specified 15.1.2 Method of measurement |
| 30 | 15.2 DC component Xdc 15.2.1 Characteristics to be specified Figure 6 – Peak and bottom values of displacement Figure 7 – Displacement curve |
| 31 | 15.2.2 Method of measurement 15.3 Distortion limited peak displacement Xd 15.3.1 Characteristics to be specified 15.3.2 Method of measurement 15.4 Sinusoidal peak displacement Xs Figure 8 – DC component of displacement |
| 32 | 16 Amplitude frequency response 16.1 Rated frequency range 16.2 Frequency response 16.2.1 Characteristic to be specified 16.2.2 Method of measurement 16.3 Mean sound pressure in a stated frequency band 16.3.1 Characteristics to be specified 16.3.2 Method of measurement |
| 33 | 16.4 Effective frequency range 16.4.1 Characteristics to be specified 16.4.2 Method of measurement 17 Amplitude non-linearity 17.1 Total harmonic distortion (THD) 17.1.1 Characteristic to be specified 17.1.2 Method of measurement for input voltages up to the rated sinusoidal voltage |
| 34 | 17.2 Harmonic distortion of the nth order 17.2.1 Characteristic to be specified 17.2.2 Method of measurement for input voltages up to the rated sinusoidal voltage 17.3 Total higher-order harmonic distortion components (HOHD) 17.3.1 Characteristic to be specified 17.3.2 Method of measurement for input voltages up to the rated sinusoidal voltage |
| 35 | 17.4 Modulation distortion of the nth order (where n = 2 or n = 3) 17.4.1 Characteristic to be specified 17.4.2 Method of measurement |
| 36 | 18 Listening test 18.1 Listening test for normal operation 18.2 Listening test for irregular distortion |
| 37 | 19 Input voltage/electrical power 19.1 Rated noise voltage/power 19.1.1 Characteristic to be specified 19.1.2 Method of measurement Figure 9 – Block diagram of test setup |
| 38 | 19.2 Short-term maximum input voltage/power 19.2.1 Characteristic to be specified 19.2.2 Method of measurement 19.2.3 Protective devices |
| 39 | 19.3 Long-term maximum input voltage/power 19.3.1 Characteristic to be specified 19.3.2 Method of measurement 19.3.3 Protective devices 19.4 Rated sinusoidal voltage/power 19.4.1 Characteristic to be specified 19.4.2 Method of measurement |
| 40 | 20 Environmental testing 20.1 Temperature ranges 20.1.1 Performance-limited temperature range – Characteristic to be specified 20.1.2 Damage-limited temperature range – Characteristic to be specified 20.2 Humidity ranges 20.2.1 Relative humidity range – Characteristic to be specified 20.2.2 Damage-limited humidity range – Characteristic to be specified 20.3 Cold storage 20.3.1 Characteristic to be specified 20.3.2 Method of measurement 20.4 Cold usage 20.4.1 Characteristic to be specified 20.4.2 Method of measurement |
| 41 | 20.5 Dry heat storage 20.5.1 Characteristic to be specified 20.5.2 Method of measurement 20.6 Dry heat usage 20.6.1 Characteristic to be specified 20.6.2 Method of measurement |
| 42 | 20.7 Thermal shock (rapid change of temperature with prescribed time of transition) 20.7.1 Characteristic to be specified 20.7.2 Method of measurement 20.8 Steady damp heat 20.8.1 Characteristic to be specified 20.8.2 Method of measurement |
| 43 | 21 Stray magnetic fields 21.1 General 21.2 Static components 21.2.1 Characteristic to be specified 21.2.2 Method of measurement Figure 10 – Measuring apparatus for stray magnetic field |
| 44 | 21.3 Dynamic components 21.3.1 Characteristic to be specified 21.3.2 Method of measurement |
| 45 | 22 Physical characteristics 22.1 Dimensions 22.2 Weight 23 Design data |
| 46 | Bibliography |
