• Title/Summary/Keyword: Binaural cue coding

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Low-bitrate Multichannel Audio Coding (저비트율 멀티채널 오디오 부호화)

  • Jang, Inseon;Seo, Jeongil;Beak, Seungkwon;Kang, Kyeongok
    • Journal of Broadcast Engineering
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    • v.10 no.3
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    • pp.328-338
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    • 2005
  • Technology for compressing low-bitrate multichannel audio coding is being standardized owing to the increasing need of consumer for multichannel audio contents. In this paper we propose the sound source location cue coding (SSLCC) for extremely compressing multichannel audio to be suitable at the narrow bandwidth transmission environment. To improve the compression capability of the conventional binaural cue coding(BCC), the SSLCC adopts the virtual source location information (VSLI) as a spatial cue parameter, a symmetric uniform quantizer, and Huffman coder. The objective and subjective assessment results show that the SSLCC provides lower bitrate and better audio quality than conventional BCC method.

The Development of audio codec using binaural cue coding technologies (Binaural Cue Coding 기술을 이용한 오디오 코덱 구현)

  • Seo Jeongil;Kang Kyeongok;Lee Byonghwa;Hahn Minsoo
    • Proceedings of the Acoustical Society of Korea Conference
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    • spring
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    • pp.137-140
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    • 2004
  • 낮은 대역폭에서 다채널 다객체 오디오 신호를 전송하기위해 새롭게 제안된 Spatial Audio Coding 기술은 멀티채널 오디오 신호를 다운믹싱하고 나머지 채널은 음향공간상의 위치정보를 나타내는 파라미터들로 압축하여 표현하는 파라메트릭 압축 방식이다. 본 논문에서는 Spatial Audio Coding 기술중의 하나인 BCC 기술을 이용하여 스테레오 오디오 코덱을 구현하고, 주관듣기평가 실험을 통하여 AAC와 비슷한 성능을 나타내면서도 높은 압축율을 얻을 수 있음을 확인하였다.

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An Efficient Representation Method for ICLD with Robustness to Spectral Distortion

  • Beack, Seung-Kwon;Seo, Jeong-Il;Kang, Kyung-Ok;Hanh, Min-Soo
    • ETRI Journal
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    • v.27 no.3
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    • pp.330-333
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    • 2005
  • The Inter-Channel Level Difference (ICLD) is a cue parameter to estimate spectral information in a binaural cue coding that has been recently in the spotlight as a multichannel audio signal compression technique. Even though the ICLD is an essential parameter, it is generally distorted by quantization. In this paper, a new modified ICLE representation method to minimize the quantization distortion is proposed by adopting a flexible determination of the reference channel and the unidirectional quantization. Our experimental result confirms that the proposed method improves the multichannel audio output quality even with the reduced bit-rate.

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Angle-Based Virtual Source Location Representation for Spatial Audio Coding

  • Beack, Seung-Kwon;Seo, Jeong-Il;Moon, Han-Gil;Kang, Kyeong-Ok;Hahn, Min-Soo
    • ETRI Journal
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    • v.28 no.2
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    • pp.219-222
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    • 2006
  • Virtual source location information (VSLI) has been newly utilized as a spatial cue for compact representation of multichannel audio. This information is represented as the azimuth of the virtual source vector. The superiority of VSLI is confirmed by comparison of the spectral distances, average bit rates, and subjective assessment with a conventional cue.

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An efficient method of spatial cues and compensation method of spectrums on multichannel spatial audio coding (멀티채널 Spatial Audio Coding에서의 효율적인 Spatial Cues 사용과 그에 따른 Spectrum 보상방법)

  • Lee, Byong-Hwa;Beack, Seung-Kwon;Seo, Jeong-Gil;Han, Min-Soo
    • MALSORI
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    • no.53
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    • pp.157-169
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    • 2005
  • This paper proposes an efficiently representing method of spatial cues on multichannel spatial audio coding. The Binaural Cue Coding (BCC) method introduced recently represents multichannel audio signals by means of Inter Channel Level Difference (ICLD) or Source Index (SI). We tried to express more efficiently ICLD and SI information based on Inter Channel Correlation in this paper. We adopt different spatial cues according to ICC and propose a compensation method of empty spectrums created by using SI. We performed a MOS test and measuring spectral distortion. The results show that the proposed method can reduce the bitrate of side information without large degradation of the audio quality.

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An efficient multichannel spatial audio coding method based on inter channel correlation (채널상관성에 기반한 효율적인 멀티채널 spatial audio coding 방법)

  • Lee Byonghwa;Beack Seungkwon;Seo Jeongil;Hahn Minsoo
    • Proceedings of the Acoustical Society of Korea Conference
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    • autumn
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    • pp.157-160
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    • 2004
  • Spatial Audio Coding 방법 중 하나인 Binaural Cue Coding 방법은 다채널 다객체 오디오 신호를 모노나 스테레오로 다운 믹스한 신호와 spatial 큐를 전송해 디코더에서 복원하는 기술로 작은 비트 율로 다채널 오디오 신호를 전송 복원해 내는 기술이다. 본 논문은 BCC 코딩 방법에서 채널 상관도를 나타내는 ICC 파라메터에 따라 spatial cue 종류를 달리함으로써 전송되는 부가정보의 비트 율을 줄이는 방법을 제안한다.

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Multi-Channel Audio Coding Method with Virtual Source Location Information (멀티채널 오디오 재생 시스템에서 가상 음원의 위치 정보를 이용한 압축 재생 방법)

  • Moon Han-gil
    • Proceedings of the Acoustical Society of Korea Conference
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    • autumn
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    • pp.165-168
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    • 2004
  • 본 논문은 방송 및 통신 환경을 이용한 멀티채널 음향 재생 환경에서 다수 객체의 음상 정위를 보다 효과적이고 효율적으로 하기 위한 방법에 관한 것이다. 본 논문에서는 전송되는 정보의 양을 최소화 하면서도 재생되는 음향공간에서는 다수의 음향 객체들이 충실하게 재생되어 자연스러운 음향공간이 재현할 수 있는 방법을 제시하고가 한다. 기존 방법의 경우, 전송 선로를 통해 음원을 압축하여 전송하기 위해서는 먼저 멀티채널 신호를 합한 모노신호와 채널 신호사이의 음량차이(ICLD), 시간지연 차이(ICTD), 상관도(ICC)등을 전송하는 양귀단서 신호화 기술(Binaural Cue Coding)을 이용하고 있다. 본 논문에서는 멀티채널 음원을 분석하여, 음원의 가상 위치정보를 벡터적으로 표현하고, 이 위치벡터와 멀티채널 음원을 하나의 모노 음원으로 다운 믹스한 신호를 전송함으로써 전송 효율을 극대화 한 압축 재생 방법을 제시한다.

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Sound Quality Enhancement in MPEG Surround by Using ILD Distortion (ILD DISTORTION을 이용한 MPEG SURROUND의 음질 개선)

  • Chon, Sang-Bae;Choi, In-Yong;Sung, Koeng-Mo
    • Proceedings of the IEEK Conference
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    • 2006.06a
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    • pp.241-242
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    • 2006
  • MPEG Surround is an audio coding technology that represents multi-channel audio signal with downmixed audio signal(s) and very low bitrate side information based on Binaural Cue Coding. The side information consists of Inter-Channel Level Difference, Inter-Channel Correlation, and payloads. These two parameters are correspondent to the well-known spatial parameters in psycho-acoustics, Inter-aural Level Difference (ILD) and Inter-Aural Cross Correlation (IACC). Though ICLD is to provide perceptually equivalent ILD to the listener, however, the ILD of the original multi-channel audio signal and that of the MPEG Surround encoded signal was different. The difference between two ILD values is defined as ILD Distortion (ILDD). This paper provides how ILDD can be applied to enhance sound quality in MPEG Surround and how much ILDD is decreased.

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