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A Study on Ultra Multi-channel Audio Coding for Realistic Audio Services

  • Journal of Knowledge Information Technology and Systems
  • Abbr : JKITS
  • 2018, 13(1), pp.111-120
  • DOI : 10.34163/jkits.2018.13.1.011
  • Publisher : Korea Knowledge Information Technology Society
  • Research Area : Interdisciplinary Studies > Interdisciplinary Research
  • Published : February 28, 2018

Kwangki Kim 1

1나사렛대학교

Accredited

ABSTRACT

Realistic audio services based on ultra multi-channel audio signals are indispensable for realistic high quality video such as 3D movies and UHD broadcasting. Generally, since the ultra multi-channel audio signals to be more than 10.2 channels has very high data rate, an efficient ultra multi-channel audio coding method is required to enable the realistic audio services in a wired/wireless network or communication environment. In this paper, we propose the ultra multi-channel audio coding based on space division of more than 10.2 channels playback layout for efficiently handling the ultra multi-channel audio signals with low bit rate and complexity. The proposed method is originated by considering the conventional 5.1 channel playback system and the usage of the multi-channel audio coder such as MPEG Surround or SSLCC. Input ultra multi-channel audio signals are divided into five spaces such as Center, Left Front, Left Back, Right Front, and Right Back and allocated signals to each space are independently encoded. One down-mix and power ratio parameters for each space are extracted through the encoding process and five down-mix signals from each space are coded by the conventional multi-channel audio coding. We implemented a simple ultra multi-channel audio coder adopting the down-mixing and the power ratio of the audio signal to check the feasibility of the proposed method and we confirmed that the proposed ultra multi-channel audio coding has low bit-rate to be less than 200 kbps for 10.2 channel audio signals. Since the proposed method focused on low bit-rate and complexity and it may be suffered from the degradation of sound quality, researches on the improvement of sound quality using a variable subband and a residual signal processing remain as future works.

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This paper was written with support from the National Research Foundation of Korea.
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