Browse Prior Art Database

Coding Device for Messages of Variable Length

IP.com Disclosure Number: IPCOM000096183D
Original Publication Date: 1963-Jan-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Desblache, A: AUTHOR

Abstract

Many devices use shift registers for sequential coding. They can be used only for messages of a given length. This device uses a coding method for messages of variable lengths comprising n characters with e bits each.

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Coding Device for Messages of Variable Length

Many devices use shift registers for sequential coding. They can be used only for messages of a given length. This device uses a coding method for messages of variable lengths comprising n characters with e bits each.

The alphabet uses a fixed end-of-message character and 2/e/-1 information characters. The e-bit register R delays by e bit times the transfer of the message to be coded towards the coding register. When the decoder D senses the end-of- message character, it switches off trigger B. This had been switched to on by the first bit of the message.

From that moment, the feedback loop of the coding register is locked. The content of that register is sent bit by bit to the transmission line after the message and the end-of-message character.

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