MPEG-4 is designed as a transport-independent, universal coding standard for multimedia content. ISMA, a consortium of 30 companies, has created an open, non-proprietary transport protocol for streaming of MPEG-4 over IP networks. For audio data, the ISMA specification 1.0 contains several modes which include optional interleaved transmission. At Fraunhofer IIS ISMA-compliant server and client applications have been implemented and are used for various performance and robustness tests. In the paper we investigate the characteristics of MPEG-4 Audio over the ISMA protocol. In particular we show how packet loss affects the subjective quality of the audio signal and quantify how well interleaving and concealment can restore a damaged signal.

Authors: Grill, Bernhard; Hahn, Thomas; Homm, Daniel; Krauss, Kurt; Ohler, Georg; Soergel, Wolfgang
Affiliations: Fraunhofer-Institut fur Integrierte Schaltungen, Erlangen ; Lehrstuhl fur Multimediakommunikation und Signalverarbeitung, Universitat Erlangen,Erlangen(See document for exact affiliation information.)
AES Convention: 112 (April 2002) Paper Number: 5514
Publication Date: April 1, 2002
Subject: Computer and Internet Audio

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