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Chordic keyboard system for generating a signal in response to a chord that is assigned using a correlation based on a composite chord-difficulty index

  • US 5,493,654 A
  • Filed: 08/09/1994
  • Issued: 02/20/1996
  • Est. Priority Date: 06/28/1991
  • Status: Expired due to Term
First Claim
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1. A chordic keyboard system for use by an operator having a hand including a thumb, fingers, and a palm, to communicate with a computer-based machine using a plurality of symbols, including a primary symbol set of said symbols, the chordic keyboard system comprising:

  • a tilted chordic keyboard with at least five keys and with an integral palm rest wherein said tilted chordic keyboard is comprised of a finger group of keys and a thumb group of keys and wherein said finger group of keys consists of four keys arranged in a finger pattern and wherein said thumb group of keys consists of at least one key and wherein said thumb group of keys are located on the keyboard in relation to said finger group of keys such that said thumb group of keys can be actuated by the thumb of the operator'"'"'s hand while the fingers of said operator'"'"'s hand are positioned on said finger group of keys and wherein said integral palm rest is integrated with said tilted chordic keyboard such that the palm of said operator'"'"'s hand can rest on and be partially supported by said integral palm rest while the fingers of said operator'"'"'s hand are positioned on said finger group of keys and the thumb of said operator'"'"'s hand is positioned on said thumb group of keys and wherein said tilted chordic keyboard is tilted at an angle in a range of 20°

    to 45°

    ;

    means for detecting a plurality of chords of said finger group of keys and said thumb group of keys produced by the actuation of said finger group of keys and said thumb group of keys;

    means for transmitting said chords to said computer-based machine; and

    means for programming said computer-based machine to receive said chords from said transmitting means and to assign to each primary symbol of said primary symbol set a unique chord, said assignment to be derived using a correlation based on a frequency-of-use index of the symbol and a composite chord-difficulty index of the unique chord such that when said computer-based machine is executing said programming means, said operator can communicate with said computer-based machine by actuating chords of keys on said tilted chordic keyboard.

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