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Fazenda, BM; Avis, MR; Davies, WJ
Languages: English
Types: Unknown
Subjects: QC221246, other
Conventional pistonic loudspeakers excite the modes of an enclosed sound field in such a way as to introduce modal\ud artefacts which may be problematic for listeners to high-quality reproduced sound [1]. Their amelioration may\ud involve the use of highly space-consumptive passive absorptive devices or active control techniques [eg 2,3,4].\ud Other approaches have concentrated on the design of the driver used to excite the room. Distributed sources ranging\ud from the dipole [5] to more complex configurations [6] may be expected to interact with the room eigenvectors in a\ud complicated manner which may be optimised in terms of the spatial and frequency-domain variance of the soundfield. Recent interest in distributed sources has centred on the Distributed Mode Loudspeaker (DML), and this paper reports an investigation into the interaction of DMLs with modal soundfields. It is shown that large DMLs may be expected to modify the low-frequency soundfield. Producing useful low-frequency control remains difficult but may be achieved in some circumstances.
  • The results below are discovered through our pilot algorithms. Let us know how we are doing!

    • [1] Fazenda, B,Davies, W.J., 'The views of Recording Studio Control Room users', Proc. of the IOA, Vol 23, Pt 8, 2001, pp213-220
    • [2] Avis, M.R., 'The active control of low frequency room modes', PhD Thesis, Salford (2000)
    • [3] Avis, M..R., 'IIR biquad controllers for low frequency acoustic resonance', Presented at 111th AES Convention, Preprint 5474, New York (2001)
    • [4] Darlington, P., Avis, M.R., 'Time Frequency Response of a Room with Active Acoustic Absorption', Presented at 100th AES Convention, Preprint 4192(H_5), Copenhagen (1996)
    • [5] Ferekidis,C.,Kempe,U., 'Room mode excitation of dipolar and monopolar low frequency sources', Presented at the 100th AES conference, Preprint 4193(H6), May 1996
    • [6] Nelson & Elliot, 'Active Control of Sound', Acad. Press 1995.
    • [7] Avis, M.R., Copley, L. 'Modelling DML panels using classical theory', Proc. of the Institute Of Acoustics, Vol.22, Pt 6, 2000
    • [8] Azima, H, Harris, N. 'Boundary Interaction of Diffuse Field Distributed-Mode Radiators', AES preprint 4635 (k 6), 1997, New York
    • [9] Azima, H, Mapp, P. 'Diffuse Field Distributed Mode Radiators and their associated Early Reflections', AES preprint 4759 (P14- 6),1998, Amsterdam
    • [10] NXT Publications, 'A Technical White Paper - A Brief Overview', New Transducers Ltd 1996
    • [11] Morse, P.M., 'Vibration and Sound', McGraw_Hill (1948) pp389_413
    • [12] Bullmore,A.J.,Nelson,P.A., et al,'The active minimization of harmonic enclosed sound fields, Part II: A computer simulation', Journal of Sound and Vibration, 1987, 177(1)
    • [13] Warburton, G. B.,'The vibration of rectangular plates', Proc. Inst. Mech. Eng. Vol. 168, no.12, 1954, pp. 371-384
  • No related research data.
  • Discovered through pilot similarity algorithms. Send us your feedback.

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