A car audio system is composed of different parts and the sound reproduction is influenced by several aspects due to the environment characteristics. In this context, one of the most sensitive part of the whole system is the equalization task. In this paper, a multipoint fixed equalization approach was presented. The equalizer is designed in the frequency domain to achieve magnitude response equalization of the selected environment. From the set of impulse responses (IRs) recorded in a real environment, a pre-equalization procedure is performed: it consists of a time-frequency segmentation applied to the minimum phase part of the selected IRs, in order to obtain a smoothing of the IRs. Then, a suitable prototype is extracted from the set of the pre-equalized IR by considering a mean approach and the inverse filter is obtained through frequency deconvolution with regularization of the prototype. Some objectives results have been reported, and in particular, a comparison with a previous method have been performed. From these results appears that the proposed method is an efficient and effective solution for dealing with IR equalization. This fact has also been confirmed by informal listening tests. However, further works will be oriented toward the evaluations of the system through intensive subjective listening tests taking into comparison different methods.
Multipoint equalization for car audio systems
2012
10 Seiten, 11 Bilder, 26 Quellen
Conference paper
English
Tema Archive | 2009
|