Interactive controller for audio object localization based on spatial representative vector operation

Abstract-In this paper, we propose a new interactive controller for audio object localization based on spatially representative vector operations on a stereo mixed source. First, we developed the interactive controller, which is equipped with a capacitive touchscreen panel so that the listener can intuitively operate audio objects displayed on the touchscreen panel with a touch pen. Next, we assessed the perceptual effects of localization and the sound quality of an audio object after performing individual operations to verify the operation of the interactive controller via a subjective evaluation. The results of the experiments clarify that the interactive controller enables the listener to change the gain and the localization of audio objects without sound degradation if the gain operation is not extreme

タテン オンバ セイギョ ト ハメン ゴウセイホウ ニ モトズク トウゴウガタ コウリョウイキ オンバ サイゲン ニ カンスル ケンキュウ

博士(Doctor)工学(Engineering)奈良先端科学技術大学院大学博第1044号甲第1044号博士(工学)奈良先端科学技術大学院大

Robust Sound Field Reproduction Integrating Multi-Point Sound Field Control And Wave Field Synthesis

ICASSP2011: The 36th International Conference on Acoustics, Speech, and Signal Processing, May 22-27, 2011, Prague, Czech Republic.For a reproduced sound field, the competing goals between the listening area and reproduction accuracy in an actual environment is one of the most important problems in sound field reproduction using loudspeakers. In this paper, we propose a new method of balancing these goals with absolute accuracy using an inverse filter of the room acoustics: the null space of a generalized inverse matrix given by a compensation filter of the wave field outside the control points. To develop an expression for the compensation filter, we use the loudspeaker driving function of wave field synthesis (WFS) in stead of the filter used in conventional studies. By using WFS, the proposed method overcomes the compensation limitation of auditory distance and azimuth perception outside the control points. The results of computer simulations revealed that the proposed method balances the competing goals and has wide applicability in a spatial domain with high accuracy of reproduction both under free-field conditions and in a simulation model with room reflection

Experimental Evaluation of Hybrid 3D Sound Field Reproduction integrating Multi-point Sound Field Control and Wave Field Synthesis

3DSA2011: The 3rd International Conference on 3D Systems and Applications, 20-22 June, 2011, Seoul, Korea.For a reproduced sound field, the competing goals between the listening area and reproduction accuracy in all actual environment is one of the most important problems in sound field reproduction using loudspeakers. In previous work, we proposed the method of balancing these goals with absolute accuracy using an inverse filter of the room acoustics: the null space of a generalized inverse matrix given by a compensation filter of the waνe field outside the control points. In this paper, we evaluate the proposed method through the wavefront measurement. To develop an expression for the compensation filter, we use the loudspeaker driving function of wavefield synthesis (WFS) to overcomes the compensation limitation of auditory distance and azimuth perception outside the control points. The results of objective evaluations revealed that the proposed method balances the competing goals and has wide applicability in a spatial domain with high accuracy of reproduction under the actual environment

Comparative Study on Directly-Aligned Multi-Point Controlled Wavefront Synthesis and Wave Field Synthesis

In this paper, we address a comparative study on Directly-Aligned Multi-Point Controlled Wavefront Synthesis (DMCWS) and Wave Field Synthesis (WFS) for realization of high-accuracy sound reproduction system, where amplitude, phase and attenuation characteristics of the wavefronts generated by DWCWS and WFS are assessed. First, in DMCWS, we can derive an optimal control line coordinate based on a numerical analysis. Next, the results of computer simulations reveal that the wavefront of DMCWS has wide availability in both spatial and frequency domains with few amplitude and phase errors, especially beyond the spatial aliasing frequency in WFS. Finally we can point out that the amplitude error of DMCWS has similar behavior to well-known spatial decay approximation expression of WFS; this implies an easiness in handling the amplitude error estimation of DMCWS. From these findings, we can conclude an advantageous position of DMCWS compared with WFS.APSIPA ASC 2009: Asia-Pacific Signal and Information Processing Association, 2009 Annual Summit and Conference. 4-7 October 2009. Sapporo, Japan. Poster session: Audio and Electroacoustics (5 October 2009)

Object-based stereo up-mixer for wave field synthesis based on spatial information clustering

EUSIPCO2012: The 20th European Signal Processing Conference, August 27-31, 2012, Bucharest, RomaniaTo build an acoustic system that can maintain the localization of sound images included in stereo mixed signals, we propose a new object-based up-mixer that performs sound source separation and sound location estimation. First, in a preliminary experiment, we show the effectiveness of sound location estimation using the proposed up-mixer via objective tests. Next, we evaluate the perception accuracy of sound localization by wave field synthesis using the proposed up-mixer via subjective tests. The results show that the proposed up-mixer provides a good localization of sound images included in stereo mixed signals at several listening positions