Specific properties of phase characteristics of Distributed Mode Loudspeakers

• Autorzy: Czesak Karol , Kleczkowski Piotr

Identyfikatory

DOI

10.21008/j.0860-6897.2023.2.13

• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

DML; distributed mode loudspeakers; loudspeaker phase; loudspeaker characteristics; loudspeaker measurements

PL

głośniki DML; faza głośnika; charakterystyka głośnika; pomiary głośnika

• Wydawca: Poznan University of Technology. Institute of Applied Mechanics
• Czasopismo: Vibrations in Physical Systems
• Rocznik: 2023
• Tom: Vol. 34, nr 2
• Strony: art. no. 2023213
• Opis fizyczny: Bibliogr. 9 poz., fot. kolor., rys., wykr.

Twórcy

autor

Czesak Karol

• AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Kraków

• https://orcid.org/0000-0002-6849-7784

autor

Kleczkowski Piotr

• AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Kraków

• https://orcid.org/0000-0003-4038-9164

Bibliografia

• 1. N.J. Harris, M.O.J. Hawksword; Introduction to Distributed Mode Loudspeaker (DML) with first-order behavioural modelling; IEE Proc. Circ. Dev. Syst., 2000, 147(3), 153-157
• 2. M.C. Heilemann, D.A. Anderson, S. Roessner, M.F. Bocko; The Evolution and Design of Flat-Panel Loudspeakers for Audio Reproduction; J. Audio Eng. Soc., 2021, 69(1-2), 27-39; DOI: https://doi.org/10.17743/jaes.2020.0057
• 3. K. Czesak, P. Kleczkowski; Directivity pattern of Distributed Mode Loudspeakers; Archives of Acoustics, 2021, 46(4), 701; DOI: 10.24425/aoa.2021.139646
• 4. K. Czesak, P. Kleczkowski, A. Król-Nowak; Metodyka wyznaczania charakterystyk kierunkowości głośników modów rozproszonych; In: Postępy w inżynierii dźwięku i psychoakustyce, 2nd ed. (in Polish); Aleksandra Król-Nowak, Eds.; Wydawnictwa AGH, 2022, 111-120; DOI: 10.7494/978-83-67427-06-7_11
• 5. K. Czesak, P. Kleczkowski; Wybrane aspekty charakterystyk kierunkowości głośników modów rozproszonych; Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie, 2022, In: Postępy badań w inżynierii dźwięku i obrazu (in Polish); Krzysztof Opieliński, Eds.; Oficyna Wydawnicza Politechniki Wrocławskiej, 2023, (in press)
• 6. M. Karjalainen, E. Piirilä, A. Järvinen, J. Huopaniemi; Comparison of loudspeaker equalization methods based on DSP techniques.; J. Audio Eng. Soc., 1999, 47(1-2), 14-31
• 7. R.C. Heyser; Loudspeaker Phase Characteristics and Time Delay Distortion: Part 1; J. Audio Eng. Soc., 1969, 17(1), 30-41
• 8. D.A. Anderson, M.C. Heilemann, M.F. Bocko; Flat-Panel Loudspeaker Simulation Model with Electromagnetic Inertial Exciters and Enclosures; J. Audio Eng. Soc., 2017, 65(9), 722-732; DOI: https://doi.org/10.17743/jaes.2017.0027
• 9. M.C. Heilemann, D.A. Anderson, M.F. Bocko; Sound-Source Localization On Flat-Panel Loudspeakers; J. Audio Eng. Soc., 2017, 65(3), 168-177; DOI: https://doi.org/10.17743/jaes.2016.0066

Uwagi

Opracowanie rekordu ze środków MNiSW, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2024).