An hybrid approach of low frequency room equalization: Notch filters based on common acoustical pole modeling

In this paper, a new method of low frequency multiple-point equalization for room acoustics is presented. This approach is theoretically based on Common Acoustical Pole (CAP) modeling of the room transfer functions developed previously by Haneda et al. [1]. With the hybrid approach, the multiple-point equalizer is made up with cascaded notch filters which coefficients are directly determined from the CAP model. This new method reduces the complexity of the equalizing structure in addition to an automatisation of notch filters design which should be very attractive to many applications such as home theater systems by intelligently controlling room modes.