In this study, a crosstalk cancellation frequency domain filter algorithm was developed, investigated and tested in an anechoic environment to find out if high resolution pre-processing gives enough channel separation. The crosstalk cancellation system was shown to provide up to 50 dB cancellation at some frequencies, both in anechoic environment and in the car compartment, when selecting a loudspeaker placement close to the head. This is probably because of the high natural cancellation achived. The mean crosstalk cancellation achived for all loudspeaker positions inside the car compartment was about 30 dB for the frequency range 500 - 6000 Hz. Different loudspeaker positions' ability to reproduce the spatial information in the sound signals was evaluated through a listening test. Signal sounds were difficult to place in front of the listener due to front/back confusion. The speakers located behind the head seems to be a good option for placing sounds behind the driver when using sound sources with fairly wide frequency content. Since there is a high risk of front/back confusion for all loudspeaker positions and sound types, a standard stereo system might be a better technique for placing sounds in front of the listener. The quality of the reproduced sounds seems to be highly affected by the number of singular values, which occured during the filter inversion process. Sounds which have information over a wide frequency range seems to be affected more by singular values than sounds with a limited bandwidth. By selecting more optimal loudspeaker positions, the number of singular values may be reduced, and areas still inflicted by bad conditions could be compensated for by approximations. Also, by choosing or designing sounds with no spectral information in problematic areas may increase robustness.
3D-sound in car compartments based on loudspeaker reproduction using crosstalk cancellation
2011
11 Seiten, 11 Bilder, 3 Tabellen, 11 Quellen
Conference paper
English
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