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- W2121070289 abstract "In the near future, 16 and 8 kbit/s toll- or near-toll low-rate codecs are expected to be used together with 32 kbit/s digital circuit multiplication equipment, providing speech compression and digital speech interpolation. Additionally, a growing proportion of international calls originate from different digital cellular/satellite mobile (C/SM) systems. Knowledge of the end-to-end voice quality of tandem connections is fundamental in the planning of international circuits. Previous studies assessed tandem performance of cellular codecs and the fixed network, however satellite-mobile systems were not included. This paper presents a subjective evaluation of the voice quality of tandem connections of C/SM codecs in seven basic scenarios. This study concludes that the number of codecs used in tandem should be minimized and network capacity has to be increased for a given traffic load if voice quality cannot be compromised. In extreme cases, calls originating from C/SM terminals should be transmitted using clear channels." @default.
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- W2121070289 date "2002-11-22" @default.
- W2121070289 modified "2023-09-25" @default.
- W2121070289 title "Performance assessment of tandem connection of cellular and satellite-mobile coders" @default.
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- W2121070289 doi "https://doi.org/10.1109/icassp.1997.596204" @default.
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