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dc.contributor.author林春發en_US
dc.contributor.authorTsun-Fa Linen_US
dc.contributor.author劉啟民en_US
dc.contributor.authorChi-Min Liuen_US
dc.date.accessioned2014-12-12T02:22:53Z-
dc.date.available2014-12-12T02:22:53Z-
dc.date.issued1999en_US
dc.identifier.urihttp://140.113.39.130/cdrfb3/record/nctu/#NT880392057en_US
dc.identifier.urihttp://hdl.handle.net/11536/65456-
dc.description.abstract本論文中將在MPEG-4 TwinVQ的架構上改善向量量化的兩個問題。第一個是增加向量量化的抗雜訊能力,另一個則是減少碼書搜尋的複雜度。索引指派是在不增加冗餘位元下增加向量量化抗雜訊能力的傳統方法,我們根據MPEG-4 TwinVQ的架構與碼書,設計出增加TwinVQ抗雜訊能力的通道編碼方法。在增加碼書搜尋速度方面,我們提出了兩個搜尋演算法以加快在有動態權重變化下向量量化的碼書搜尋速度。第一個方法是利用部分誤差搜尋法(PDS)及向量中元素有不同權重的特性來減少碼書搜尋的計算量,第二個方法是利用改進候選者刪選門檻來改進第一個方法,實驗結果顯示這兩個方法能在不損失重建訊號品質的情況下分別減少平均66%及73%的計算量。zh_TW
dc.description.abstractThis thesis considers two issues of vector quantization (VQ) based on MEPG-4 TwinVQ. One is the robustness against channel noise; the other is the computational complexity of codebook search. Index assignment is a traditional method for VQ to improve robustness. This thesis considers the index assignment method based on MPEG-4. On the codebook search, two fast search algorithms for dynamic weighted VQ are proposed. The first algorithm is based on partial distortion search method (PDS) which searches entries in codebook by the partial distortion according to the associated weights. The second algorithm further reduces the computational complexity by obtaining the precise threshold to skip the candidates with the partial distortion. Simulation indicates that the first algorithm and the second algorithm reduce the complexity by 66 percent and 73 percent respectively without degrading the reconstructed quality.en_US
dc.language.isozh_TWen_US
dc.subject頻率域加權交錯之向量量化zh_TW
dc.subject兩共軛分量之向量量化zh_TW
dc.subject抗通道雜訊能力zh_TW
dc.subject索引指派zh_TW
dc.subject快速搜尋演算法zh_TW
dc.subject部份誤差搜尋法zh_TW
dc.subjectTwinVQen_US
dc.subjectTCCVQen_US
dc.subjectRobustness against channel noiseen_US
dc.subjectIndex assignmenten_US
dc.subjectFast search algorithmen_US
dc.subjectPartial distortion search methoden_US
dc.titleMPEG-4音訊壓縮中TwinVQ之探討zh_TW
dc.titleTwinVQ in MPEG-4 Audio Codingen_US
dc.typeThesisen_US
dc.contributor.department資訊科學與工程研究所zh_TW
Appears in Collections:Thesis