Automat und Mensch.: Kybernetische Tatsachen und Hypothesen. by Karl Steinbuch

By Karl Steinbuch

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Additional resources for Automat und Mensch.: Kybernetische Tatsachen und Hypothesen. (German Edition)

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B. Bild 17) haufig als "IIAMMrNG-Distanz". Zum AbschluB einige Begriffsbestimmungen (in Anlehnung an Empfehlungen der Nachrichtentechnischen GeseUschaft): Bit: Das Bit ist die Zahleinheit fiir Binarentscheidungen (als "binar" werden Vorgange bezeichnet, die nur zwei bedeutungsvolle Zustande haben, die meist mit 0 und 1 bezeichnet werden). Das Bit wird als Hauptwort groB, als Kurzzeichen klein geschrieben, die Mehrzahl ohne s (z. B. 5 bit). Oode: Zuordnung zwischen zwei Listen von Zeichen oder Zeichenserien, letztere heiBen in diesem Fall auch Codeworter.

Urn noch andereNachrichten, vor allem Ziffern ubertragen zu konnen, macht man eine "Ziffern-Umschaltung". Hierbei teilt der Sender dem Empfanger mit, daB von nun an Ziffern gesendet werden und deshalb ein anderes Decodierungsschema verwendet werden solI. Werden dann wieder Buchstaben ubertragen, dann wird davor das Signal "Buchstaben-Umschaltung" gesendet. Mit m Binarzeichen kann man eine spezielle aus 2 m Nachrichten auswahlen. Umgekehrt braucht man zur Identifizierung einer speziellen von N Nachrichten [ld N] Binarzeichen.

Die physikalisch beschreibbare Situation kann aber nicht mit beliebiger Genauigkeit angegeben werden. AuBer den bereits genannten Schwierigkeiten besteht einc prinzipieHe Grenze in der sogenannten Unschiirferelation der Atomphysik. Diese besagt z. , daB der Ort und die Geschwindigkeit eines Teilchens nicht beide beliebig genau gemessen werden k6nnen, und zwar wegen der unvermeidbaren St6rung des Me130bjekts durch den MeBvorgang. Die Unschiirfe liegt darin, da13 das Produkt aus der Ungenauigkeit der Ortsmessung und der Ungenauigkeit der Impulsmessung mindestens gleich dem PLANCK'schen Wirkungsquantum ist.

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