Reproducing Virtual Sound Sources in Front of a Loudspeaker Array Using Inverse Wave Propagator

Koyama, Shoichi; Furuya, Kazuo; Hiwasaki, Yusuke; Hori, Yoichi

doi:10.1109/tasl.2012.2188514

Cited by 15 publications

(9 citation statements)

References 16 publications

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“…Because the driving signals of the loudspeaker array are calculated on the basis of an analytically derived filter, the systems can transmit sound fields to remote locations with a low delay [63], [64]. Sound images can be represented in front of loudspeakers by applying an inverse wave propagator [65], and then an original space and a destination space can be overlapped. A duplex communication system can be developed by using such sound field transmission systems and implementing multichannel acoustic echo cancellation [66], [67].…”

Section: Space Sharingmentioning

confidence: 99%

Virtual Reality Technologies in Telecommunication Services

Nagata

Mikami

Miyashita

et al. 2017

Journal of Information Processing

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Telecommunication service has been growing and progressing from telephone to high reality communication systems that are based on evolution of network and media technologies. Recognizing virtual reality (VR) as a communication tool, we provide a review of communication services and the directions they are moving in, as well as related VR technologies. The Immersive Telepresence System "Kirari!" is also introduced as the latest development example for a new telecommunication service.

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Section: Space Sharingmentioning

confidence: 99%

Virtual Reality Technologies in Telecommunication Services

Nagata

Mikami

Miyashita

et al. 2017

Journal of Information Processing

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“…It should be noted that the extrapolated region is assumed to be free-field. When d y is larger than the distance between the receiving line and the primary sources, the pri- mary sources are virtually reconstructed in front of the secondary source line [24]. However, the sound field in the region between the virtual primary sources and the secondary source line is inverted.…”

Section: Wfr Filter For Linear Arrays Of Microphones and Loudspeakersmentioning

confidence: 99%

“…When the listeners are in front of the virtual sound source, i.e., y > 1.0 m, it is expected that the listeners can localize the source at this position. It should be noted that finite array length approximation also makes the reproduced region smaller [24].…”

Section: Measurement Of Reproduced Sound Fieldmentioning

confidence: 99%

Real-Time Sound Field Transmission System by Using Wave Field Reconstruction Filter and Its Evaluation

Koyama

Furuya

Uematsu

et al. 2014

IEICE Trans. Fundamentals

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A new real-time sound field transmission system is presented. To construct this system, a large listening area needs to be reproduced at not less than a constant height. Additionally, the driving signals of the loudspeakers should be obtained only from received signals of microphones. Wave field reconstruction (WFR) filtering for linear arrays of microphones and loudspeakers is considered to be suitable for this kind of system. An experimental system was developed to show the feasibility of real-time sound field transmission using the WFR filter. Experiments to measure the reproduced sound field and a subjective listening test of sound localization were conducted to evaluate the proposed system. Although the reproduced sound field included several artifacts such as spatial aliasing and faster amplitude decay, the experimental results indicated that the proposed system was able to provide sound localization accuracy for virtual sound sources comparable to that for real sound sources in a large listening area. key words: sound field reproduction, sound field transmission, wave field reconstruction filter, wave field synthesis, spatio-temporal frequency

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“…Many kinds of methods based on WFS have been developed, including least squares (LS) algorithms that use the inverse of the transfer functions between each pair of recording and loudspeaker positions [11,12], the spatial Fourier transform [13,14], and the inverse wave propagator [15]. In most cases, since these methods were proposed and implemented using a pair of linear microphone and loudspeaker arrays based on a 2.5D WFS [4,5] for horizontal sound field reproduction, they cannot synthesize vertical sound fields [11,12,14,15].…”

Section: Introductionmentioning

confidence: 99%

“…In most cases, since these methods were proposed and implemented using a pair of linear microphone and loudspeaker arrays based on a 2.5D WFS [4,5] for horizontal sound field reproduction, they cannot synthesize vertical sound fields [11,12,14,15]. However, not only horizontal reproduction but also vertical reproduction is critical when using a big screen system.…”

Section: Introductionmentioning

confidence: 99%