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Data Compression Of Characterization Tables For Multi-Keyboard Electronic Typewriter Disclosure Number: IPCOM000067883D
Original Publication Date: 1979-Oct-01
Included in the Prior Art Database: 2005-Feb-20

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Related People

Cullum, PG Rehorn, EE Robb, MA [+details]


A data compression technique is utilized which reduces the size of the characterization table required for each language in a multi-keyboard electronic typewriter. It allows more languages to be put in the same memory unit. Electronic typewriters employ a look-up table which characterizes the operation of each key. Each key may be characterized several ways depending upon the various machine states. For example, depressing the "U" key prints a lower case or capital "U" depending on the state of the shift key. In a multi-keyboard electronic typewriter, changes in language also change the operation of the keys. However, analysis of groupings of languages show that many keys retain the same operation regardless of the language selected.