Driver Filter Design for Software-Implemented Loudspeaker Crossovers

• Autorzy: Yao S. N.

Identyfikatory

DOI

10.2478/aoa-2014-0063

• Języki publikacji: EN

Abstrakty

EN

A hybrid method is presented for the integration of low-, mid-, and high-frequency driver filters in loud- speaker crossovers. The Pascal matrix is exploited to calculate denominators; the locations of minimum values in frequency magnitude responses are associated with the forms of numerators; the maximum values are used to compute gain factors. The forms of the resulting filters are based on the physical meanings of low-pass, band-pass, and high-pass filters, an intuitive idea which is easy to be understood. Moreover, each coefficient is believed to be simply calculated, an advantage which keeps the software- implemented crossover running smoothly even if crossover frequencies are being changed in real time. This characteristic allows users to efficiently adjust the bandwidths of the driver filters by subjective listening tests if objective measurements of loudspeaker parameters are unavailable. Instead of designing separate structures for a low-, mid-, and high-frequency driver filter, by using the proposed techniques we can implement one structure which merges three types of digital filters. Not only does the integra- tion architecture operate with low computational cost, but its size is also compact. Design examples are included to illustrate the effectiveness of the presented methodology.

Słowa kluczowe

EN

crossover; loudspeaker; pole-zero placement; Pascal matrix; driver filter

• Wydawca: Instytut Podstawowych Problemów Techniki PAN ; Komitet Akustyki PAN ; Polskie Towarzystwo Akustyczne
• Czasopismo: Archives of Acoustics
• Rocznik: 2014
• Tom: Vol. 39, No. 4
• Strony: 591--597
• Opis fizyczny: Bibliogr. 8 poz., rys., tab., wykr.

Twórcy

autor

Yao S. N.

• School of Electronic, Electrical and Computer Engineering, University of Birminghamg Edgbaston, Birmingham, B15 2TT, UK

Bibliografia

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• 4. Pradabpet C., Yimman S., Hinjit W., Chivapreecha S., Dejhan K. (2003), Design and implementation of biquad digital filter, Proceedings of the IEEE Asia-Pacific Conference on Communications, 1138–1142.
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• 6. Psenicka B., Garcia-Ugalde F., Herrera-Camacho A. (2002), The bilinear Z transform by Pascal matrix and its application in the design of digital filters, IEEE Signal Processing Letters, 9, 11, 368–370.
• 7. Waterschoot V.T., Moonen M. (2007), Pole-zero placement technique for designing second-order IIR parametric equalizer filters, IEEE Trans. Audio Speech Lang. Process., 15, 8, 2561–2565.
• 8. Yao S.N., Collins T., Jančovič P. (2012), Hybrid method for designing digital Butterworth filters, Computers & Electrical Engineering, 38, 4, 811–818.