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Experimental Validation of Equalizing Filters for Car Cockpits Designed with Warping Techniques

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Sound reproduction within a car is a difficult task. Reverberation, reflection, echo, noise, and vibration are some of the issues that account for the difficulty. The first step in the direction of increasing sound comfort is to equalize the acoustic pressure response in the frequency domain. To accomplish this task, the inversion of the measured sound pressure level (SPL) should be performed. The inversion of this system's transfer function is the key point of the equalizing procedure, and many advanced techniques were developed toward this aim. However, they produce a large number of FIR filter taps and thus cannot be implemented in real-time on a low-cost DSP. Frequency warping theory allows one to design a filter especially fitted for low frequencies with a small number of taps. In this paper an automatic tool to develop warped filters for target car cockpits equalization was designed and validated through experiments in commercial cars.:

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