Results for Room Acoustics Equalisation Based on Smoothed Responses

Digital equalisation of room acoustics based on inverse filtering of measured response functions, introduces a number of theoretical and practical challenges. To overcome such problems, inverse filtering based on modified measured responses is proposed, derived via their complex Transfer Function smoothing, so that the processed responses are more perceptually compliant, of lower order and less position-sensitive than the original functions. Aim of this study is to evaluate via objective and subjective tests conducted for different-sized rooms and real-time reproduction, the use of such smoothed room responses for the derivation of appropriate room equalisation filters, which can improve the perceived and measured quality of audio reproduction in any reverberant environment.

[1]  Francis Rumsey,et al.  Identification of Perceived Spatial Attributes of Recordings by Repertory Grid Technique and Other Methods , 1999 .

[2]  Michael A. Gerzon,et al.  Practical Adaptive Room and Loudspeaker Equaliser for Hi-Fi Use , 1992 .

[3]  John Mourjopoulos,et al.  THE APPLICATION OF COMPLEX SPECTRAL SMOOTHING IN THE ANALYSIS OF ROOM ACOUSTICS , 2001 .

[4]  Jyri Huopaniemi,et al.  Comparison of Loudspeaker Equalization Methods Based on DSP Techniques , 1999 .

[5]  Ronald P. Genereux.  Adaptive Loudspeaker Systems: Correcting for the Acoustic Environment , 1990 .

[6]  Lars G. Johansen,et al.  Target Functions and Preprocessing Techniques in Digital Equalization Design , 1999 .

[7]  Rodney A. Kennedy,et al.  Equalization in an acoustic reverberant environment: robustness results , 2000, IEEE Trans. Speech Audio Process..

[8]  John Mourjopoulos,et al.  Room Masking: Understanding and Modelling the Masking of Reflections in Rooms , 2001 .

[9]  John Mourjopoulos,et al.  Spectral, Phase, and Transient Equalization for Audio Systems , 1985 .

[10]  Rodney A. Kennedy,et al.  Nonminimum-phase equalization and its subjective importance in room acoustics , 2000, IEEE Trans. Speech Audio Process..

[11]  Matti Karjalainen,et al.  Low-Frequency Modal Equalization of Loudspeaker-Room Responses , 2001 .

[12]  John Mourjopoulos.  On the variation and invertibility of room impulse response functions , 1985 .

[13]  Subjective Assessment of Sound Quality , .

[14]  Shoji Makino,et al.  Multiple-point equalization of room transfer functions by using common acoustical poles , 1997, IEEE Trans. Speech Audio Process..