對於無所不在之多媒體串流服務，一個利用分層式音訊/視訊編碼並可用於異質網路上之多媒體串流方案是需要的。此論文提出一個分層式音訊/視訊之串流方案，其中包含一個基於人類感知及預測可用頻寬之頻寬適應技術與兩階式影音同步技術。此論文提出之系統中，音訊與視訊利用BSAC (bit sliced arithmetic coding)與FGS (Fine-granular scalability)之編碼技術將其切割成一個基礎層與多個加強層。於兩階式影音同步技術中，利用分層式音訊/視訊編碼之優點，延遲抖動消除程序、條件式重傳及影音播放同步等技術可降低不穩定之網路環境與變動之解碼時間對同步播放所造成的影響。實驗結果顯示，論文中提出之方案是一個適用於在異質網路上傳輸之無所不在多媒體串流方案。

For a ubiquitous multimedia streaming, an adaptive multimedia streaming scheme with multiple layered audiovisual (AV) coding is required over heterogeneous networks. This thesis proposes a multiple layered audiovisual streaming scheme to deliver layered audiovisual data. Fine-granular scalability (FGS) and bit sliced arithmetic coding (BSAC) techniques are used to segment video and audio data into individual base-layer and multiple enhancement-layer bitstreams. With advantages of layered coding, two phases of streaming synchronization are proposed based on the characteristic of the human-perception and the result of the bandwidth adaptation. The de-jitter procedure, conditional retransmission and playout synchronization are used to transmit hybrid multiple layered audiovisual bitstreams.
Experiment results show that the proposed system is a feasible streaming scheme to overcome challenges of the ubiquitous multimedia streaming, e.g., constrained available bandwidth, quality degradation, unsmooth playback, etc.

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