| Autor: |
Tomita, Yasuhiro, Kimura, Tsukasa, Kimata, Hideaki, Ichikawa, Tadashi, Ichinose, Susumu |
| Předmět: |
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| Zdroj: |
Electronics & Communications in Japan, Part 1: Communications; Mar2000, Vol. 83 Issue 3, p105-115, 11p |
| Abstrakt: |
NEWPRED is an interframe coding system that prevents error propagation and has been proposed as a means of video communication that can operate effectively in environments prone to transmission errors, such as mobile communication networks. This article proposes and evaluates the efficacy of a memory control method that causes little performance degradation even when the reference frame memory is limited, such as in mobile terminal equipment, and a new variation of NEWPRED that is ideally suited to this memory control method. We first demonstrate that interframe coding cannot be sustained when the amount of reference frame memory is limited, which impairs the performance of NEWPRED. We then propose a memory control method that makes effective use of reference frame memory and is also applicable to existing systems, and a revised version of NEWPRED in which this memory control method works most effectively. Using a computer simulation, we clarify the relationship between the error rate of the transmission path, the response delay time, and the amount of memory required by each method. By making a comparative evaluation of signal-to-noise ratios (SNRs) in the proposed system and existing systems to which the proposed memory control method has been applied, we demonstrate that the proposed system achieves the highest SNR with a limited amount of reference frame memory. © 1999 Scripta Technica, Electron Comm Jpn Pt 1, 83(3): 105–115, 2000 [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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