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Measurement of nonlinear and Doppler distortion in Distributed Mode Loudspeakers

100%

Czesak K. , Kleczkowski P.

International Journal of Electronics and Telecommunications

2024

tom Vol. 70, No. 2

443--448

Distributed Mode Loudspeakers (DMLs), as other electroacoustic transducers with electrodynamic excitation, are susceptible to the occurrence of nonlinear distortion. The literature on nonlinear distortion in DMLs is scarce. The vibrations of the DML panel are very small in amplitude, thus the coil excursion of the exciter is low, which is a favorable condition for low nonlinear distortion. The scope of this paper covers investigation of harmonic and intermodulation distortion, occurring in the DML. The harmonic distortion was examined with two methods and the intermodulation distortion - with three, including one author’s proposed method. The result indicate, that nonlinear distortion in DMLs may be a bigger problem than those in diaphragm loudspeakers.

Specific properties of phase characteristics of Distributed Mode Loudspeakers

72%

Czesak K. , Kleczkowski P.

Vibrations in Physical Systems

2023

tom Vol. 34, nr 2

art. no. 2023213

Distributed Mode Loudspeakers (DMLs) are characterized by a specific principle of operation, based on bending oscillations of a plate with a certain stiffness and dimensions. Because of this property DML produce a diffuse sound field in the proximity of the loudspeaker. In this work a series of phase characteristics measurements of a DML was carried out, which were compared with analogous ones, carried out for a conventional electrodynamic loudspeaker with a pistonic diaphragm. The elevations of measurement points were chosen in order to coincide with the most likely positions of a listener relative to the DML. A measurement on the axis of the transducer was also conducted. The results have demonstrated that the variability of phase value resulting as a function of frequency and localization of a measurement point is high. It may be concluded, that the DML is a non-minimum phase system, with some frequency regions of minimum phase behaviour. These regions are strongly dependent on the point of measurement.