A cluster centroid method for room response equalization at multiple locations

Sound and Music Computing

“…In the approach of [121,139], "representative prototypical room responses" are derived from several measured room responses that share similar characteristics using the fuzzy c-means unsupervised learning method. The prototypical responses are then combined to form "a general point response" based on the fuzzy standard additive model of Kosko [141,142].…”

“…A fuzzy c-means clustering method is applied in [30,[70][71][72]121,139,140]. In the approach of [121,139], "representative prototypical room responses" are derived from several measured room responses that share similar characteristics using the fuzzy c-means unsupervised learning method.…”

“…In [72], the authors have combined the multi-point fuzzy c-means clustering technique of [121] (see Section 6.2) with a dual-band multirate approach, separating the low-frequency band below 80 Hz from the high-frequency band beyond 80 Hz. The low-frequency band is decimated by a factor of 256 to work with small length room responses, prior to applying the fuzzy c-means clustering technique for designing the equalizer.…”

Spherical harmonic analysis of equalization in a reverberant room

“…Even a change in the source or microphone position of a few tenths of a wavelength creates a large variation in the room channel response and large degradation in equalized output [2,3,4]. Techniques have been suggested to combat this robustness problem [5,6,7].…”

Automatic Crossover Frequency Selection for Multichannel Home-Theater Applications

“…1, where the satellites (left, center, right, left surround and right surround speakers) are positioned surrounding the listener and the sub-woofer may be placed in the corner or near the edges of a wall. The high-pass (satellite) and lowpass (subwoofer) bass management filters, used in the audio industry, |H hp bm,ω c (ω)| = 1 − 1/ 1 + (ω/ω c ) 4 and |H lp bm,ωc (ω)| = 1/ 1 + (ω/ω c ) 8 , are Butterworth second order high-pass (12 dB/octave roll-off) and fourth order lowpass (24 dB/octave roll-off), respectively, and are designed with a crossover frequency ω c (i.e., the intersection of the corresponding 3 dB points) corresponding to 80 Hz. Examples of other crossover networks that split the signal energy between the subwoofer and the satellites, according to predetermined crossover frequency and slopes, can be found in [1,2,3].…”