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BS EN 62458:2011

$142.49

Sound system equipment. Electroacoustic transducers. Measurement of large signal parameters

Published By Publication Date Number of Pages
BSI 2011 28
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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.

PDF Catalog

PDF Pages PDF Title
6 CONTENTS
8 INTRODUCTION
9 1 Scope
2 Normative references
3 Terms and definitions
Figures
Figure 1 – Electro-dynamical transducer
11 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
12 5 Mounting condition
5.1 Drive units
5.2 Loudspeaker systems
6 Climatic conditions
7 Acoustical environment
8 Preconditioning
13 9 Time-varying properties of the loudspeaker
10 Methods of measurement
10.1 General
10.2 Static or quasi-static method
14 10.3 Point-by-point dynamic method
Figure 2 –Static and quasi-static measurement setup
15 Figure 3 – Setup for measurement of large signal parameters by using the point-by-point dynamic method
16 10.4 Full dynamic method
Figure 4 – Setup for dynamic measurement of large signal parameters
17 11 Nonlinear force factor
11.1 Force factor curve Bl(x)
18 11.2 Force-factor limited displacement, XBl
Figure 5 – Reading the maximal peak displacement xB limited by force factor only
19 11.3 Symmetry point, xsym(xac)
Figure 6 – Reading the voice coil offset from the symmetry point xsym(xac) curve
20 11.4 Voice coil offset, xoffset
12 Nonlinear stiffness
12.1 Nonlinear stiffness curve Kms(x)
Figure 7 – Definition of the symmetry point xsym in the nonlinear force factor characteristic Bl(x)
21 12.2 Compliance-limited displacement xC
12.3 Stiffness asymmetry AK(xpeak)
22 13 Displacement-dependent inductance, Le(x)
13.1 Inductance curve Le(x)
Figure 8 – Reading the stiffness asymmetry from the Kms(x) curve
23 13.2 Inductance-limited displacement, xL
14 Current -dependent inductance, Le(i)
14.1 Characteristic to be specified
14.2 Method of measurement
24 15 Parameters derived from geometry and performance
15.1 Maximal peak displacement, xMAXd
15.2 Method of measurement
25 Bibliography
BS EN 62458:2011
$142.49