文档介绍：Example from "Loudspeaker Bibliography"
Accurate model for the push-pull electrostatic loudspeaker.
Patrick De Visschere
University of Gent
Department of Electronics and Information Systems,
St. Pietersnieuwstraat 41, B-9000 Gent, Belgium.
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Abstract
A model is developed for the electrostatic loudspeaker, which incorporates
simultaneously the mechanical, the acoustical and the electrical behaviour
of the diaphragm. The non-linear model can be solved fairly accurate in
steady-state and is used for calculating the frequency- and level-dependent
sensitivity and distortion for an infinite strip push-pull electrostatic
loudspeaker. The results pared with previously published and new
improved small-signal approximations.
1 Introduction.
The push-pull electrostatic loudspeaker (pp-ESLS) is known as a high-
quality loudspeaker. The basic characteristics of this transducer have been
studied by Hunt[1]. In this monograph, which was first published in 1954, a
one-dimensional model for the pp-ESLS (as well as for the single-sided
ESLS) is worked out. To handle the inherent non-linear behaviour of the
ESLS Hunt performed a harmonic analysis and by neglecting higher order
harmonics was able to calculate these harmonics consecutively. The radia-
tion loading was incorporated by means of a mechanical impedance.
Although probably all relevant properties could be addressed in this way a
more accurate and more general model for the ESLS should at least be two-
dimensional in order to describe the vibration of the diaphragm properly.
Such an analysis must cope with plications. Since the vibration of
the diaphragm is to a large extent determined by the air-reaction, the me-
chanical problem of the vibrating diaphragm must be solved together with
the radiation equation. This was done by Streng[2,3] for a circular mem-
brane. In a subsequent paper the same author addressed the pli-
cation[4], namely the depe