In recent years, voice over IP has become an attractive alternative to conventional public telephony. However, the Internet is a best-effort network, with no guarantee on its quality of service. A fundamental issue in real-time interactive voice transmissions over an unreliable Internet protocol network is packet loss. This problem is especially serious in transmitting low-bit-rate coded speech in which pervasive dependencies are introduced in a bit stream, leading to error propagation to subsequent frames when loss happens. In this talk, we survey existing work in the area and present an end-to-end loss-concealment scheme that requires no special support from the underlying network. In particular, we focus on developing a non-redundant sender-receiver collaborated multiple-description coding (MDC) scheme. We propose a new coder-dependent parameter-based MDC that generates multiple descriptions systematically based on correlations of coding parameters. The design is done in such a way that requires no extra transmission bandwidth and that adapts its number of descriptions to network loss conditions. Extensive tests on FS CELP, ITU G.723.1, FS MELP, and G.729 for different loss scenarios demonstrate the high quality and reliability of our proposed scheme.
{"title":"Loss Concealments for Low Bit-Rate Packet Voice in Voice over IP","authors":"B. Wah","doi":"10.1109/MMSE.2004.49","DOIUrl":"https://doi.org/10.1109/MMSE.2004.49","url":null,"abstract":"In recent years, voice over IP has become an attractive alternative to conventional public telephony. However, the Internet is a best-effort network, with no guarantee on its quality of service. A fundamental issue in real-time interactive voice transmissions over an unreliable Internet protocol network is packet loss. This problem is especially serious in transmitting low-bit-rate coded speech in which pervasive dependencies are introduced in a bit stream, leading to error propagation to subsequent frames when loss happens. In this talk, we survey existing work in the area and present an end-to-end loss-concealment scheme that requires no special support from the underlying network. In particular, we focus on developing a non-redundant sender-receiver collaborated multiple-description coding (MDC) scheme. We propose a new coder-dependent parameter-based MDC that generates multiple descriptions systematically based on correlations of coding parameters. The design is done in such a way that requires no extra transmission bandwidth and that adapts its number of descriptions to network loss conditions. Extensive tests on FS CELP, ITU G.723.1, FS MELP, and G.729 for different loss scenarios demonstrate the high quality and reliability of our proposed scheme.","PeriodicalId":305502,"journal":{"name":"International Symposium on Multimedia Software Engineering","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131403006","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A viewpoint is any representational scheme on some collection of data objects, together with a mechanism for accessing this content. Thus a viewpoint is any structure from which we can elicit an informative result from a collection of data by presenting a query. A multiple viewpoint system allows a searcher to pose queries to one viewpoint and then change to another viewpoint while retaining context. This is a very general framework that is applicable to any information retrieval system.
{"title":"Using Multiple Viewpoints to Improve Retrieval Effectiveness in Content-Based Image Retrieval","authors":"J. French","doi":"10.1109/MMSE.2004.86","DOIUrl":"https://doi.org/10.1109/MMSE.2004.86","url":null,"abstract":"A viewpoint is any representational scheme on some collection of data objects, together with a mechanism for accessing this content. Thus a viewpoint is any structure from which we can elicit an informative result from a collection of data by presenting a query. A multiple viewpoint system allows a searcher to pose queries to one viewpoint and then change to another viewpoint while retaining context. This is a very general framework that is applicable to any information retrieval system.","PeriodicalId":305502,"journal":{"name":"International Symposium on Multimedia Software Engineering","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116568674","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The vision of ubiquitous computing (UC) More than a decade after its invention, Mark Weiser's vision of ubiquitous computing finally seems to spark many research activities world wide. This article reviews the ideas behind ubiquitous computing and puts them into the context of the technical possibilities of today and to- morrow. The lack of appropriate software engineering approaches is identifed as a major obstacle on the route. Following the discussion of open sofnvare engineering issues in general, multimedia related issues are empha- sized. The five-step UbiMedia chain is proposed as a ref- erence model for the reconciliation of ubiquitous comput- ing and multimedia.
{"title":"Ubiquitous Computing and Its Influence on MSE","authors":"M. Mühlhäuser","doi":"10.1109/MSE.2000.10000","DOIUrl":"https://doi.org/10.1109/MSE.2000.10000","url":null,"abstract":"The vision of ubiquitous computing (UC) More than a decade after its invention, Mark Weiser's vision of ubiquitous computing finally seems to spark many research activities world wide. This article reviews the ideas behind ubiquitous computing and puts them into the context of the technical possibilities of today and to- morrow. The lack of appropriate software engineering approaches is identifed as a major obstacle on the route. Following the discussion of open sofnvare engineering issues in general, multimedia related issues are empha- sized. The five-step UbiMedia chain is proposed as a ref- erence model for the reconciliation of ubiquitous comput- ing and multimedia.","PeriodicalId":305502,"journal":{"name":"International Symposium on Multimedia Software Engineering","volume":"191 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123004192","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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