Comparison of digital loudspeaker - equalization techniques

• Autorzy: Dziechciński P.
• Języki publikacji: EN

Abstrakty

EN

An overview of digital equalization techniques for loudspeaker systems is presented. The known algorithms are systematized and modified. Equalization is effected by a single digital filter for the on-axis loudspeaker response. Besides classical FIR and IIR digital filter structures, their warped versions (WFIR and WIIR) are used to build equalization systems. Equalizers of different types are compared with regard to efficiency. Also information about objective and listening-test assessments of the quality of equalization obtained by the different equalizers is provided. Besides the equalizer quality assessment techniques know from the literature, new techniques, which better represent the properties of the human auditory system, are proposed. For the new techniques better agreement between the objective results and the listening-test ratings was obtained. On the basis of objective assessments of 32 equalization systems carried out for two stereophonic pairs of loudspeaker systems algorithms yielding the best results for each of the tested filter structures (FIR, IIR, WFIR and WIIR) were selected and evaluated by listening tests.

Słowa kluczowe

EN

equalizer; digital filter; loudspeaker system

• Wydawca: Instytut Podstawowych Problemów Techniki PAN ; Komitet Akustyki PAN ; Polskie Towarzystwo Akustyczne
• Czasopismo: Archives of Acoustics
• Rocznik: 2005
• Tom: Vol. 30, No. 2
• Strony: 193--216
• Opis fizyczny: Bibliogr. 38 poz., rys., wykr.

Twórcy

autor

Dziechciński P.

• Wrocław University of Technology, Institute Telecommunications and Acoustics, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland,

Bibliografia

• [1] AES 20: 1996. AES recommended practice for professional audio – Subjective evaluation of loudspeakers, Audio Engineering Society, Inc., 1996.
• [2] BASZTURA CZ., Źródła, sygnały i obrazy akustyczne, WKŁ, Warszawa 1988.
• [3] CHEN W., Performance of the cascade and parallel IIR filters, 97-th Convention of the Audio Engineering Society, San Francisco, November 1994, preprint 3901.
• [4] CHRISTOPHOROU J., Low-frequency loudspeaker measurements with an accelerometer, J. Audio Eng. Soc., 28, 11, 809–816 (1980).
• [5] CLARKSON P. M., MOURJOPOULOS J., HAMMOND J. K., Spectral, phase and transient equalization for audio systems, J. Audio Eng. Soc., 33, 3 (1985).
• [6] DOBRUCKI A., SZMAL C., ŻYSZKOWSKI Z., Dyspersja charakterystyk skuteczności głośników jako miara zniekształceń linearnych, Prace Naukowe Instytutu Telekomunikacji i Akustyki Politechniki Wrocławskiej nr 21, Seria studia i materiały nr 10, Wrocław 1975, s. 19–26.
• [7] DZIECHCIŃSKI P., Porównanie metod projektowania cyfrowych filtrów korekcyjnych, Materiały XLVI Otwartego Seminarium z Akustyki, Kraków-Zakopane 1999, s. 383–388.
• [8] EBU – Listening conditions for the assessment of sound programme material: Monophonic and two-channel stereophonic, EBU tech. 3276, 2nd edition, Geneva 1998.
• [9] FARINA A., BELLINI A., ARMELLONI E., Implementation of cross-talk canceling filters with warped structures – Subjective evaluation of the loudspeaker reproduction of stereo recordings, Proc. of SHARC2000, Boston, 11–13 September 2000.
• [10] GABOR A., Badanie określonych szeregiem Volterry charakterystyk toru elektroakustycznego, Praca doktorska, Komunikat nr 10, ITA Politechnika Wrocławska, Wrocław 1975.
• [11] GREEN D. M., MASON C. R., Auditory profile analysis: frequency, phase, and Weber’s law, J. Acoust. Soc. Am., 77, 3, 1155–1161 (1985).
• [12] GREENFIELD R. G., HAWKSFORD M. O. J., Efficient filter design for loudspeaker equalization, J. Audio Eng. Soc., 39, 10 (1991).
• [13] GREŃ J., Statystyka matematyczna: modele i zadania, Wydanie VI, PWN, Warszawa 1978.
• [14] HÄRMÄ A., KARJALAINEN M., SAVIOJA L., VÄLIMÄKI V., LAINE U. K., HUOPANIEMI J., Frequency-warped signal processing for audio applications, 108-th Convention of the Audio Engineering Society, Paris 2000, preprint 5171.
• [15] HAWKSFORD M. O., Minimum-phase signal processing for loudspeaker systems, 100-th Convention of the Audio Engineering Society, Copenhagen May 1996, preprint 4212.
• [16] KARACHALIOS G., TSOUKALAS D., MOURJOPOULOS J., Multiband analysis and equalization of loudspeaker response, 98-th Convention of the Audio Engineering Society, Paris, 1995, preprint 3975.
• [17] KARJALAINEN M., HÄRMÄ A., LAINE U. K., Realizable warped IIR filters and their properties, Proceedings of ICASSP ’97, Munich, April 1997, s. 2200 – 2208.
• [18] KARJALAINEN M., PIIRILÄ E., JÄRVINEN A., HUOPANIEMI J., Comparison of loudspeaker equalization methods based on DSP techniques, 102-nd Convention of the Audio Engineering Society, Munich March 1997, preprint 4437.
• [19] D. B. KEELE JR., Low-frequency loudspeaker assessment by nearfield sound-pressure measurement, J. Audio Eng. Soc., 22, 154–162 (1974).
• [20] KIRKEBY O., NELSON P. A., HAMADA H., ORDUNA-BUSTAMANTE F., Fast deconvolution of multichannel systems using regularization, IEEE Trans. Acoust., Speech, Signal-Process., 6, (2) March 1998.
• [21] MITRA S. K., KAISER J. F., Handbook for digital signal processing, Wiley&Sons, 1993.
• [22] MOURJOPOULOS J., Digital equalization methods for audio systems, 84-th Convention of the Audio Engineering Society, Paris, March 1988, preprint 2598.
• [23] OPPENHEIM A. V., SCHAFER R. W., Cyfrowe przetwarzanie sygnałów, WKŁ, Warszawa 1979.
• [24] PARKS T. W., BURRUS C. S., Digital filter design, John Wiley & Sons, New York 1987.
• [25] PRUCHNICKI P., Modelowanie zniekształceń nieliniowych głośników dynamicznych metodą NARMAX, Praca doktorska Instytutu Telekomunikacji i Akustyki Politechniki Wrocławskiej, Wrocław 2002.
• [26] RUTKOWSKI L., Filtry adaptacyjne i adaptacyjne przetwarzanie sygnałów, WNT, Warszawa 1994.
• [27] SALAMOURIS S., POLITOPOULOS K., TSAKIRIS V., MOURJOPOULOS J., Digital system for loudspeaker and room equalisation, 98-th Convention of the Audio Engineering Society, Paris 1995, preprint 3976.
• [28] SELESNICK I. W., LANG M., BURRUS C. S., Constrained least square design of FIR filters without specified transition bands, IEEE Transactions on Signal Processing, 44, 8.
• [29] Signal Processing Toolbox User’s Guide Version 4, Mathworks 1998.
• [30] SMALL R. H., Simplified loudspeaker measurements at low frequencies, J. Audio Eng. Soc., 20, 1/2, 252–257 (1972).
• [31] SMITH J. O., ABEL J., Bark and ERB bilinear transform, Trans. Speech and Audio Processing, 7, 6, 697–708 (1999).
• [32] STEIGLITZ K., MCBRIDE L. E., A technique for the identification of linear systems, IEEE Trans. Automatic Control, AC-10 (1965).
• [33] STRUCK CH. J., TEMME S. F., Simulated free field measurements, J. Audio Eng. Soc., 42, 6 (1994).
• [34] TOOLE F. E., OLIVE S. E., The modification of timbre by resonances: Perception and measurement, J. Audio Eng. Soc., 33, 3, 120–141 (1988).
• [35] TYRIL M., PEDERSEN J. A., RUBAK P., Digital filters for low frequency equalization, 106-th Convention of the Audio Engineering Society, Munich 1999, preprint 4897.
• [36] Urządzenia i systemy elektroakustyczne. Badania odsłuchowe głośników. PN91T04499/13, Wydawnictwa Normalizacyjne “Alfa”, Warszawa 1991.
• [37] Urządzenia i systemy elektroakustyczne wysokiej wierności odtwarzania. Minimalne wymagania techniczne. Zestawy głośnikowe. PN-88-T06256/07, 1988.
• [38] WILSON R., Equalization of loudspeaker drive units considering both on- and off axis responses, J. Audio Eng. Soc., 39, 3 (1991).