IEC 62458:2010(E) applies to transducers such as loudspeaker drive units, loudspeaker systems, headphones, micro-speakers, shakers and other actuators using either an electro-dynamical or electro-magnetic motor coupled with a mechanical suspension. The large signal behaviour of the transducer is modelled by a lumped parameter model considering dominant nonlinearities such as force factor, stiffness and inductance. It defines the basic terms and parameters of the model, the methods of measurements and the way the results should be reported. It cancels and replaces IEC\/PAS 62458 published in 2006. It constitutes a technical revision. The main changes are: – descriptions of the methods of measurement are adjusted to the state of the technology; – addition of Clauses 4 to 15; – integration of Annex A in the main body of the standard; – overall textual review.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 6<\/td>\n | CONTENTS <\/td>\n<\/tr>\n | ||||||
| 8<\/td>\n | INTRODUCTION <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | 1 Scope 2 Normative references 3 Terms and definitions Figures Figure 1 \u2013 Electro-dynamical transducer <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | 4 Test signals 4.1 General 4.2 Large d.c. signal 4.3 Large d.c. signal and small a.c. signal 4.4 Broadband noise signal 4.5 Music <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 5 Mounting condition 5.1 Drive units 5.2 Loudspeaker systems 6 Climatic conditions 7 Acoustical environment 8 Preconditioning <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 9 Time-varying properties of the loudspeaker 10 Methods of measurement 10.1 General 10.2 Static or quasi-static method <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | 10.3 Point-by-point dynamic method Figure 2 \u2013Static and quasi-static measurement setup <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | Figure 3 \u2013 Setup for measurement of large signal parameters by using the point-by-point dynamic method <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | 10.4 Full dynamic method Figure 4 \u2013 Setup for dynamic measurement of large signal parameters <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 11 Nonlinear force factor 11.1 Force factor curve Bl(x) <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | 11.2 Force-factor limited displacement, XBl Figure 5 \u2013 Reading the maximal peak displacement xB limited by force factor only <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | 11.3 Symmetry point, xsym(xac) Figure 6 \u2013 Reading the voice coil offset from the symmetry point xsym(xac) curve <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | 11.4 Voice coil offset, xoffset 12 Nonlinear stiffness 12.1 Nonlinear stiffness curve Kms(x) Figure 7 \u2013 Definition of the symmetry point xsym in the nonlinear force factor characteristic Bl(x) <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | 12.2 Compliance-limited displacement xC 12.3 Stiffness asymmetry AK(xpeak) <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | 13 Displacement-dependent inductance, Le(x) 13.1 Inductance curve Le(x) Figure 8 \u2013 Reading the stiffness asymmetry from the Kms(x) curve <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | 13.2 Inductance-limited displacement, xL 14 Current -dependent inductance, Le(i) 14.1 Characteristic to be specified 14.2 Method of measurement <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | 15 Parameters derived from geometry and performance 15.1 Maximal peak displacement, xMAXd 15.2 Method of measurement <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Sound system equipment. Electroacoustic transducers. Measurement of large signal parameters<\/b><\/p>\n |