Papers

HE-AAC 부호화의 저비트율에서 음질향상 기법

Domestic Journal
2006~2010
작성자
한혜원
작성일
2008-02-01 00:58
조회
1487
Authors : 김정근, 이재성, 이태진, 강경옥, 박영철
Year : 2008
Publisher / Conference : 한국음향학회지
Volume : 27, 제 2호
Page : 66-74
본 논문에서는 HE-AAC (High Efficiency Advanced Audio Coding) 오디오 부호화기의 저주파 대역과 고주파 대역을 담당하고 있는 AAC부호화기와 SBR (Spectral Band Replication) 부호화기에 대해 낮은 비트율에서 효과적인 개선 방법을 제안한다. AAC 부호화기가 담당하는 저주파 대역에서 과도신호가 발생하는 부분의 프리에코를 줄이기 위하여 적용 주파수범위가 저주파 대역 방향으로 선택적으로 확장되는 eTNS (exteded Temporal Noise Shaping) 방법을 고안하였다. 또한 SBR에 의해 부호화되는 고주파 대역에서 톤 성분 복원 시에 잡음층 (Noise floor)이 추가 발생되지 않도록 정현파 모델을 통해 톤을 사전 인지하고 인지된 톤들의 주파수를 QMF 밴드의 중앙으로 재배치하여 성능 향상을 이루었다. 제안한 방법들을 사용하여 복호화한 샘플 음원들에 대해 주/객관적 음질평가를 실시한 결과, 표준 HE-AAC에 비해 향상된 결과를 보여주었다.
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