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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 5,642,108 A
  • Filed: 12/29/1994
  • Issued: 06/24/1997
  • Est. Priority Date: 06/28/1991
  • Status: Expired due to Term
First Claim
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1. A chordic keyboard system in a data processing apparatus, wherein the chordic keyboard system is used to communicate with a chordic keyboard including a plurality of keys, the chordic keyboard system comprising:

  • means for storing data representative of a plurality of chords, wherein each chord corresponds to a subset of the plurality of keys of the chordic keyboard, and for storing a plurality of symbols, wherein data representative of a chord corresponds to one of the plurality of symbols according to a correlation between a frequency-of-use index of the symbol and a composite chord-difficulty index of the chord, the composite chord-difficulty index being computed by ranking the plurality of chords based on a sum of a first index and a second index, the first index ranking the chords based on the ability of humans to memorize an association of the chords with a pattern and the second index ranking the chords based on the biomechanical and motor difficulty of inputting the chords;

    means for receiving data from the chordic keyboard identifying a selected chord of the plurality of chords;

    means for identifying a selected symbol of the plurality of symbols representative;

    of the selected chord; and

    means, coupled to the identifying means, for generating a signal corresponding to the selected symbol.

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