Journal of Broadcast Engineering (방송공학회논문지)

The Korean Institute of Broadcast and Media Engineers (한국방송∙미디어공학회)
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Performance Evaluation of the MPEG USAC According to the Spectral Band Replication Bandwidth

Spectral Band Replication 대역폭에 따른 MPEG USAC 부호화 성능 평가

  • 안경준 (서울시립대학교 전자전기컴퓨터공학부) ;
  • 정유선 (서울시립대학교 전자전기컴퓨터공학부) ;
  • 백승권 (한국전자통신연구원 실감음향연구팀) ;
  • 강경옥 (한국전자통신연구원 실감음향연구팀) ;
  • 김인철 (서울시립대학교 전자전기컴퓨터공학부)
  • Received : 2011.06.26
  • Accepted : 2011.09.02
  • Published : 2011.09.30
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Abstract

This paper deals with the effect of SBR bandwidth on the overall performance of the MPEG USAC. Here, the SBR bandwidth is termed the frequency region covered by the SBR codec, and is specified by the bs_stop_freq, which is one of the SBR bitstream components. The performance of the USACs with 5 different SBR bandwidths are compared in a subjective manner using the MUSHRA test. In the comparison, the bit rate is confined to 14~24kbps and only the LPD unit is selected for the core codec. From the comparison, it is observed that the SBR bandwidth that stretches up to 18KHz or above gives the better performance than the others.

본 논문에서는 SBR의 대역폭이 MPEG USAC의 전체 성능에 끼치는 영향을 다룬다. 여기서 SBR 대역폭은 SBR 코덱이 적용되는 주파수 영역을 말하고 SBR 비트열 성분 중 하나인 bs_stop_freq에 의해 규정된다. 다섯 개의 서로 다른 SBR 대역폭을 가질 때 USAC의 성능을 MUSHRA 테스트라는 주관적인 방법으로 비교하였다. 이 비교에서 전송률은 14~24Kbps로 한정하였고, 주부호화기로는 LPD만을 사용하였다. 실험결과 SBR 대역폭이 18KHz 이상일 때가 다른 대역폭에 비해 좋은 성능을 보이는 것으로 관측되었다.

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References

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