Advertisement

Reduction of Multichannel Sound System Based on Spherical Harmonics

  • Shanshan Yang
  • Xiaochen Wang
  • Dengshi Li
  • Ruimin Hu
  • Weiping Tu
Part of the Lecture Notes in Computer Science book series (LNCS, volume 8879)

Abstract

In order to meet people’s demand for 3D audio in family, it’s a critical problem to recreate a 3D spatial sound field with few loudspeakers. In this paper, we introduce a L- to (L-1)-channel reduction method based on spherical harmonic decomposition and sound field of head can be perfectly reproduced. When loudspeakers are too few to perfectly reproduce the sound field of head, we ensure low distortions of sound field at ears. On this basis, multichannel reduction algorithm from L- to M-channel system is proposed. As an example, reduction of NHK 22.2 system has been implemented and eleven loudspeaker arrangements from 22 to 6 channels are derived. Results show the sound field of head can be reproduced perfectly until 10 channels and 8-, 6-channel systems can keep low distortions at ears. Compared with Ando’s multichannel conversion method by subjective evaluation, our proposed method is better in terms of sound localization.

Keywords

3D audio multichannel system reduction sound field reproduction spherical harmonics 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    Ward, D.B., Abhayapala, T.D.: Reproduction of a plane-wave sound field using an array of loudspeakers. IEEE Transactions on Speech and Audio Processing 9(6), 697–707 (2001)CrossRefGoogle Scholar
  2. 2.
    Wu, Y.J., Abhayapala, T.D.: Theory and design of soundfield reproduction using continuous loudspeaker concept. IEEE Transactions on Audio, Speech, and Language Processing 17(1), 107–116 (2009)CrossRefGoogle Scholar
  3. 3.
    Zhang, W., Abhayapala, T.: Three Dimensional Sound Field Reproduction using Multiple Circular Loudspeaker Arrays: Functional Analysis Guided Approach. IEEE Transactions on Audio, Speech, and Language Processing 22(7), 1184–1194 (2014)CrossRefGoogle Scholar
  4. 4.
    Kennedy, R.A., Sadeghi, P., Abhayapala, T.D., Jones, H.M.: Intrinsic Limits of Dimensionality and Richness in Random Multipath Fields. IEEE Transactions on Signal Processing 55(6), 2542–2556 (2007)MathSciNetCrossRefGoogle Scholar
  5. 5.
    Ahrens, J., Spors, S.: Applying the ambisonics approach to planar and linear distributions of secondary sources and combinations thereof. Acta Acustica United with Acustica 98(1), 28–36 (2012)CrossRefGoogle Scholar
  6. 6.
    Spors, S., Ahrens, J.: Analysis and improvement of pre-equalization in 2.5-dimensional wave field synthesis. In: Audio Engineering Society Convention 128. Audio Engineering Society (2010)Google Scholar
  7. 7.
    Hamasaki, K., Matsui, K., Sawaya, I., Okubo, H.: The 22.2 Multichannel Sounds and its Reproduction at Home and Personal Enviroment. In: Audio Engineering Society Conference: 43rd International Conference: Audio for Wirelessly Networked Personal Devices. Audio Engineering Society (2011)Google Scholar
  8. 8.
    Ando, A.: Conversion of multichannel sound signal maintaining physical properties of sound in reproduced sound field. IEEE Transactions on Audio, Speech, and Language Processing 19(6), 1467–1475 (2011)CrossRefGoogle Scholar
  9. 9.
    Sawaya, I., Oode, S., Ando, A., Hamasaki, K.: Size and Shape of Listening Area Reproduced by Three-dimensional Multichannel Sound System with Various Numbers of Loudspeakers. In: Audio Engineering Society Convention 131. Audio Engineering Society (2011)Google Scholar
  10. 10.
    Recommendation, ITU-R BS. 1284-2: General Methods for the Subjective Assessment of Sound Quality. International Telecommunications Union (2002)Google Scholar

Copyright information

© Springer International Publishing Switzerland 2014

Authors and Affiliations

  • Shanshan Yang
    • 1
  • Xiaochen Wang
    • 1
    • 2
  • Dengshi Li
    • 1
    • 3
  • Ruimin Hu
    • 1
    • 2
  • Weiping Tu
    • 1
    • 2
  1. 1.National Engineering Research Center for Multimedia Software, School of ComputerWuhan UniversityWuhanChina
  2. 2.Research InstituteWuhan University in ShenzhenChina
  3. 3.School of Computer and MathematicsJianghan UniversityWuhanChina

Personalised recommendations