Multi-zone reproduction of a shared sound field including distance effects

Taku Shimizu, Jorge Trevino, Shuichi Sakamoto, Yôiti Suzuki, Tomohiko Ise

Research output: Contribution to conferencePaper

Abstract

Expectations of recent audio technologies include the capability to present 3D spatial sound with high levels of realism. Sound field reproduction methods, which physically re-create the sound pressure field of a target acoustic space, outperform other techniques, such as the multi-channel surround systems, from a theoretical stance. However, their implementation often requires a large loudspeaker array with an impractical number of loudspeakers. The situation worsens if multiple listeners are considered since the sound field must be controlled over a region large enough to cover them all. Multi-zone sound field reproduction attempts to sidestep this problem by controlling the sound pressure inside small and disconnected regions, one for each listener. Traditionally, however, multi-zone sound field reproduction systems attempt to present a different acoustic space for each listener. This can impose unrealistic constraints for some listener positions, which affects reproduction accuracy. A shared sound field reproduction method recently proposed by the authors seeks to overcome these limitations. The proposal defines a multi-zone transfer function and uses a phase correction stage to present a single, underlying sound field at multiple disconnected regions. Its formulation is, however, limited to plane waves which cannot convey distance-related information. The present research extends the shared sound field reproduction approach by generalizing the phase correction stage as a translation operator in the spherical harmonics domain. This new signal processing can present a point source field at multiple listening regions, as verified through several numerical simulations evaluating its performance. These simulations assume the presentation of a 1 kHz point source at two listening regions using 192 loudspeakers arranged on an almost regularly sampled sphere. Simulations show the successful reproduction at the target regions, both reaching a reproduction error level below -6 dB. Furthermore, the observation of parallax effects between regions confirms that the proposal can effectively convey distance-related information.

Original languageEnglish
Publication statusPublished - 2017 Jan 1
Event24th International Congress on Sound and Vibration, ICSV 2017 - London, United Kingdom
Duration: 2017 Jul 232017 Jul 27

Other

Other24th International Congress on Sound and Vibration, ICSV 2017
CountryUnited Kingdom
CityLondon
Period17/7/2317/7/27

Keywords

  • Multi-zone sound field reproduction
  • Sound field control
  • Sound field reproduction
  • Spatial sound
  • Spherical acoustics

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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  • Cite this

    Shimizu, T., Trevino, J., Sakamoto, S., Suzuki, Y., & Ise, T. (2017). Multi-zone reproduction of a shared sound field including distance effects. Paper presented at 24th International Congress on Sound and Vibration, ICSV 2017, London, United Kingdom.