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음성 및 오디오 통합 부호화 기술

Unified Speech and Audio Codec

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참고문헌

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초록

음성 부호화기와 오디오 부호화기는 각 신호의 고유 특성과 응용분야에 최적화되어 서로 다른 구조와 동작을 가진다. 최근 통신 및 방송 서비스가 통합됨에 따라 다양한 특성의 음성 및 오디오 콘텐츠를 하나의 부호화기로 통합적으로 처리하는 것이 필요하다. 그러나 기존의 첨단 음성 또는 오디오 부호화 기술은 근본적인 구조적 차이로 인하여 통합 부호화기가 요구하는 통합 동작을 제공하지 못하며, 따라서 요구 성능을 만족시키고 음성과 오디오 신호를 통합된 구조로 모두 처리할 수 있는 새로운 음성 및 오디오 부호화 기술 연구가 필요하게 되었다. 이와 같은 요구 상황에 따라 MPEG에서도 음성 및 오디오 통합 부호화기의 표준화 과정이 진행 중이다. 본 논문에서는 통합 부호화 기술의 기반 기술에 해당하는 첨단 음성 부호화와 오디오 부호화 기술을 정리하고, 통합 동작에서의 문제점을 분석하고, 통합 부호화 기술 연구를 위한 방향과 전략을 제안한다.

Abstract

Speech codec and audio codec have different structures and operations because each is optimized for signal's unique characteristics and different application areas. Recently, due to the convergence of communication and broadcasting services, a single codec processing both speech and audio contents in a unified way is required. Current state-of-art speech or audio coding technologies, however, cannot provide the required unified operation because of their inherent structural difference, which leads to the research on new coding technologies that compress both speech and audio signals in a unified way with required performance. Based on these requirements, the standardization process of unified speech and audio codec is now in progress by MPEG. In this paper, the state-of-art speech and audio coding technologies corresponding to the key parts of unified codec research are summarized, their problems and weakness for unified operations are analyzed, and research areas and strategies for new unified codec are proposed.

참고문헌 (29)

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