8029890 대전 문지 보존 서 고 
 DICE 16006 
 Presently , we generally enjoy music passively through broadcating or by playing some LD , CD or MP 3 contents and the music contents are previously rendered by experts like a producer . But the audio channel environment has been rapidly changing from uni - directional to bi - or multi - directional ones and our desire for the music suitable to our preference has also been steadily increasing . In interactive audio services ( IASs ) , users can render selected audio objects rather freely to match their desires . The IASs have not only the advantage of reflecting personal preference but also the disadvantage of the bitrate increase to transmit all the object signals for the control of the selected objects . The bitrate increase needed for IASs cannot be a negligible obstacle for the successful commercialization of the IASs especially in mobile environments . For IASs , the spatial audio object coding ( SAOC ) scheme is fairly good in the sense of bitrate and audio quality because the SAOC can encode various needed music objects into one down - mix signal with the additional side information including spatial parameters . But rather severe audio quality degradation of the SAOC usually occurs when a single object is suppressed or played alone . To complement this problem , the SAOC scheme with Two - Step Coding ( SAOC - TSC ) was proposed . But the bitrate of the side information used in SAOC - TSC increases 2 or 3 times than that of the original SAOC because of the bitrate needed for the residual coding to enhance the audio quality . In this thesis , an efficient residual coding method for the SAOC - TSC is proposed to reduce the side information bitrate . The residual coding of the SAOC - TSC adopts the effective bandwidth of the 0 ~ 5 . 5 kHz frequency regions and the fixed bitrate . The target object and the common down - mix signals don ’ t always exist both in time and effective bandwidth . Nevertheless , the SAOC - TSC scheme , which unconditionally performs the residual coding with fixed bitrate and the effective bandwidth , is inefficient because the residual coding is not necessary when one of the two signals does not exist . Therefore it becomes necessary to adjust the effective bandwidth in accordance with the characteristics of their frequency distribution . We propose the SAOC - TSC variable residual coding ( SAOC - TSC ( VRC ) ) scheme . The bitrate of the residual coding and the effective bandwidth in the scheme can be variably decided through an analysis of the target object and the normal down - mix signal . From the experimental results , we confirm that the proposed method can reduce the bitrate of the side information without any perceptible degradation of audio quality and increase in complexity . 
 저자 명 의 영문 표기 : Byong Hwa Lee 
 수록 잡지 명 : " Efficient Residual Coding Method of Spatial Audio Object Coding with Two - Step Coding Structure for Interactive audio Services ". IEICE Transactions on Information and Systems , Vol . E 99 - D , No . 7 , 1949 - 1952 ( 2016 ) 
 양방향 오디오 서비스 
 공간 정보 파라 메타 
 공간 다 객체 오디오 코딩 
 잔차 신호 코딩 
 오디오 객체 
 Thermal resistance effects of 
 Son , Mi Hyun 
 양방향 오디오 서비스 를 위한 2 
 OFDM frame synchronization us 
 Kang , Keon - Woo