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Keyboard entry system

  • US 4,638,306 A
  • Filed: 01/30/1984
  • Issued: 01/20/1987
  • Est. Priority Date: 01/30/1984
  • Status: Expired due to Term
First Claim
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1. A keyboard entry system for a selected language, said system comprising:

  • a keyboard comprising a plurality of keys, said plurality of keys comprising a set of letter keys comprising a respective key for each letter of said selected language;

    first means, responsive to the plurality of letter keys, for generating keying signals in response to activation of the letter keys, each keying singal characterized by a respective activation time;

    second means, responsive to the first means, for generating output signals in response to the keying signals, said second means comprising;

    means for classifying a plurality of keying signals as a key chord in the event the respective activation times satisfy predetermined criteria, said classifying means comprising;

    means for setting a time threshold value prior to initiation of a typing session in said selected language;

    means for comparing an elapsed time separating the activation times of a pair of the keying signals included in the plurality of keying signals with said time threshold value; and

    means for designating said plurality of keying signals as a key chord in the event a selected one of the elapsed time and the time threshold value is greater than the other;

    means for storing a list of stored texts, each corresponding to a respective chord;

    means, responsive to the key chord for utilizing the keying signals associated with the key chord to select the one of the stored texts in the list of stored texts which correspond to the key chord;

    means for setting the output signal to correspond to the selected one of the stored text andmeans for setting the output signal to correspond to the letters corresponding to the activated letter keys in the event the respective activation times fail to satisfy said criteria.

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