Journal of Broadcast Engineering (방송공학회논문지)

The Korean Institute of Broadcast and Media Engineers (한국방송∙미디어공학회)
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A Performance Evaluation of the MPEG USAC with Variable Core-Band Down-Sampling Ratio

가변 핵심 대역 하향 표본화 비를 가진 MPEG USAC 성능 평가

  • 이재화 (서울시립대학교 전자전기컴퓨터공학부) ;
  • 김인철 (서울시립대학교 전자전기컴퓨터공학부)
  • Received : 2012.11.30
  • Accepted : 2013.01.14
  • Published : 2013.01.30
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Abstract

This paper deals with the effect of the internal sampling frequency and core band down sampling ratio on the overall performance of the MPEG USAC. Here, the internal sampling frequency is the sampling frequency of a signal actually coded. The core band down sampling ratio is the ratio of the width of the core band over that of the coded band. The performance was measured on 6 different test sound sources by the MUSHRA test with 10 subjects. The experiments showed that 1/3 or 1/4 core band down sampling ratio could yield the better performance than the conventional 1/2 ratio, especially at low rates.

본 논문에서는 내부 표본화 주파수와 핵심 대역 하향 표본화 비의 조정이 MPEG USAC의 전체 성능에 끼치는 영향을 다룬다. 여기서 내부 표본화 주파수는 실제 부호화될 때의 내부적인 표본화 주파수를 말한다. 핵심 대역 하향 표본화 비는 전체 부호화 대역폭에 대한 핵심 대역폭의 비를 나타낸다. 성능은 6개의 실험 음원에 대해 10명이 참가한 MUSHRA 검사를 통해 평가되었다. 실험에서는 기존의 1/2에 비해 1/3 혹은 1/4의 핵심 대역 하향 표본화 비를 사용하면 저전송률에서 부호화 성능을 향상시킬 수 있음을 보였다.

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References

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