Title :
Improved error resilience in mobile audio-visual communications
Author :
Naka, N. ; Adachi, S. ; Saigusa, M. ; Ohya, T.
Author_Institution :
R&D Dept., NTT Mobile Commun. Div., Kanagawa, Japan
Abstract :
Low bit rate audio-visual coding algorithms are now being actively standardized in ITU and ISO/IEC. Their application to mobile multi-media communication systems is being considered. One of the most important features in this application is robustness against the transmission errors experienced in mobile radio channels. In this paper, the speech and video quality degradations due to errors are analyzed through computer simulations. ACELP and H.263 are used as representative low bit rate coding algorithms. After summarizing major causes of degradation such as variable length codes and hierarchical data structures, some techniques to improve the error resiliency of speech and video coding schemes are proposed.
Keywords :
ISO standards; digital radio; error correction codes; interpolation; land mobile radio; linear predictive coding; multimedia communication; speech coding; telecommunication channels; telecommunication standards; variable length codes; video coding; ACELP; H.263; ISO/IEC; ITU; computer simulations; degradation; error resilience; hierarchical data structures; interpolation; low bit rate audio-visual coding algorithms; mobile audio-visual communications; mobile radio channels; multi-media communication systems; robustness; speech coding scheme; speech quality; standardization; transmission errors; variable length codes; video coding scheme; video quality; Application software; Bit rate; Computer errors; Degradation; IEC standards; ISO standards; Mobile communication; Multimedia systems; Resilience; Speech analysis;
Conference_Titel :
Universal Personal Communications. 1995. Record., 1995 Fourth IEEE International Conference on
Conference_Location :
Tokyo, Japan
Print_ISBN :
0-7803-2955-4
DOI :
10.1109/ICUPC.1995.497100
