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Communications
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Communications
Suite à un tchat entre Khrys, Gurvan et moi hier soir, nous nous sommes posés la question de savoir quelle forme auraient réellement les télécommunications interstellaires.
10 000 signes par secondes (10 Kbps) c'est moins que l'internet de années 90. Cela représente - si ils ont gardé l'octet - 1 250 Bytes/s soit 1 250 signes typographiques.
Une page d'EG c'est - grosso modo - 6 000 signes typographiques.
Les deux EG font donc 1 260 000 signes théoriques, que l'on peut royalement ramener à 700 000 à cause des illustrations. Il faut donc 560 secondes pour envoyer les EG.
Nos délires communicants, (j'entends par là les images 3D et le mépris des coûts) vont donc à l'encontre des Ecritures (euphémisme).
Que peut-on faire avec 10 kbits/s ?La graphie (le morse) va à 40 bit/s.
Le téléphone à 64 kbit/s.
La télé de papa (sauf que le mien a la même que moi) 3 Mbit/s.
Nous sommes doncLargement au-dessus des possibilités du morse
Largement en-dessous de celles de la phonie
La vidéophonie interstellaire est un rêve inaccessible
Je propose donc :Une communication haut débit pour les microcoms (plot vertébral) ; disons 1 Gbits/s, mais dans une portée de 2 m.
Une communication équivalente à une mauvaise phonie dans une limite de 30 EAL (portée maxi des les minicoms ; dits "communicateurs interstellaires" dans Empire Galactique) ; avec des cas de figure dans lesquels seuls des messages "textos" pourront passer.
Un système de graphie amélioré (un super-morse), au-delà. Cela dit, pour les cas d'urgence, on peut envisager de multiplier les canaux, mais ce n'est possible que pour de très grosses installations.
Par ailleurs, MdJ sait à quel point je suis réfractaire à l'idée de faire des comptes d'apothicaire, mais je serais partisane de tenir compte des coûts de communication.
Qu'en pensez-vous ?
Sources :
http://fr.wikipedia.org/wiki/Bande_passante
http://fr.wikipedia.org/wiki/D%C3%A9bit_binaire
http://passion.histoire.pagesperso-orang...htm#signal
http://fr.wikipedia.org/wiki/Alphabet_morse
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