Directional properties of the loudspeaker systems with analog and digital crossover networks

• Autorzy: Niewiarowicz M. , Łopacz H.
• Języki publikacji: EN

Abstrakty

EN

Directional properties of loudspeaker systems with analog and digital crossover networks have been investigated. The study has been performed for a three-way loudspeaker system subjectively classified as of average quality. The digital crossover networks have been designed in such manner that the cut-off frequencies of filters (1000 Hz and 5000 Hz) corresponded to those of the analog networks and the slopes of the amplitude characteristics were 12 and 18 dB/oct. The set of impulse responses for different angles in the whole sphere around the loudspeaker system were measured and then, applying a convolution with the excitation signals of the "tone burst" type, for some specific frequencies from the cut-off region of crossover networks, the directional characteristics have been calculated for the steady and transient states. The quantitative analyses of results, based on the values of directional coefficient, show significant differences between the characteristics in steady and transient states, as well as for the analog and digital systems.

Słowa kluczowe

EN

analog crossover network; digital crossover network; transient states; directivity

• Wydawca: Instytut Podstawowych Problemów Techniki PAN ; Komitet Akustyki PAN ; Polskie Towarzystwo Akustyczne
• Czasopismo: Archives of Acoustics
• Rocznik: 2008
• Tom: Vol. 33, No. 4
• Strony: 541--551
• Opis fizyczny: Bibliogr. 11 poz., rys., tab.

Twórcy

autor

Niewiarowicz M.

autor

Łopacz H.

• Poznań University of Medical Sciences, Otolaryngology Clinic, Przybyszewskiego 49, 60-355 Poznań, Poland,

Bibliografia

• [1] Computer modelling of spatial distribution of acoustic field emitted by a loudspeaker system, Collective Work, Institute of Acoustics, A. Mickiewicz University in Pozna´n, Factory of Loudspeakers TONSIL in Wrze´snia, 1989.
• [2] NIEWIAROWICZ M., PĘKALA P., Computer simulation of the process of sounding the rooms with the subjective evaluation as a criterion of the method efficiency, Conference of the State Committee for Scientific Researches, pp. 31–39, Kraków 1995.
• [3] FLORKOWSKI J., The problem of a loudspeaker directivity during the reproduction of impulse signals, Review of Telecommunication, 3, 48–55 (1978).
• [4] NIEWIAROWICZ M., Directional characteristics of loudspeaker system in steady and transient states, 15th ICA, pp. 245–248, Trondheim 1995.
• [5] NIEWIAROWICZ M., Directional Properties of Sound Sources During Transients, Proceedings of 98th AES Convention, preprint 4004, Paris 1995.
• [6] NIEWIAROWICZ M., ŁOPACZ H., Transmission properties of loudspeaker systems with the analog and digital crossover networks, Proceedings of the XLV Open Seminar on Acoustics, pp. 457–462, Poznań 1998.
• [7] DZIECHCIŃSKI P., Digital correction methods of linear distortions of loudspeaker units, VIII Symposium on the news in audio and video techniques, pp. 51–62, Warszawa 2002.
• [8] HAWKSFORD M.O., Digital Signal Processing Tool for Loudspeaker Evaluation and Discrete Time Crossover Design, Journal of the Audio Engineering Society, 54, 1/2, 37–62 (1997).
• [9] THIELE N., Passive All-Pass Crossover System of Order 3(Low Pass)+5(High Pass), Incorporating Driver Parameters, Journal of the Audio Engineering Society, 50, 12, 1030–1035 (2002).
• [10] HEYLEN R.M, HAWKSFORD M.O.J., Interpolation between Minimum-Phase and Linear-Phase Frequency Responses, Proceedings of 98th AES Convention, Paris 1995.
• [11] DZIECHCIŃSKI P., Comparison of digital loudspeaker – equalization techniques, Archives of Acoustics, 30, 2, 193–216 (2005).