Abstract
The maximal mutual information (channel capacity) between the input and output of a telephone connection was calculated, taking into account both the frequency and time domain aspects of this problem. This leads to define an « information index » which can be computed from objective measurements. Several examples are given, both for digital coders and for analogue transmission: they show that the information index has a very good correlation with the results of opinion tests. This index therefore constitutes the basis of a mathematical model for predicting the transmission performance of speech in a telephone network.
Résumé
On a calculé V information mutuelle maximale (capacité de la voie) entre l’origine et l’extrémité d’une chaîne de communication téléphonique, en tenant compte à la fois des aspects fréquentiels et temporels de ce problème. Ceci conduit à définir un « indice d’information » que l’on peut calculer numériquement à partir de mesures objectives. On donne plusieurs exemples, tant pour des codeurs numériques que pour la transmission analogique; ils montrent que l’indice d’information présente une très bonne corrélation avec les résultats d’essais d’opinion. Cet indice constitue donc la base d’un modèle mathématique destiné à prédire la qualité de transmission de la parole dans un réseau téléphonique.
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The French version of this paper is dealt with in the Technical note nt/dicet/ain/108 of cnet.
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Lalou, J. The information index: An objective measure of speech transmission performance *. Ann. Télécommun. 45, 47–65 (1990). https://doi.org/10.1007/BF02999563
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DOI: https://doi.org/10.1007/BF02999563
Key words
- Information theory
- Transmission performance
- Telephone
- Analogue transmission
- Digital transmission
- Mutual information
- Channel capacity
- Sound quality