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Keyboard entry system

  • US 4,694,280 A
  • Filed: 04/25/1986
  • Issued: 09/15/1987
  • 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 signal characterized by a respective depression time when the keying signal is generated in response to depression of the respective letter key, and a respective release time when the keying signal is generated in response to release of the respective letter key;

    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 depression and release times satisfy predetermined criteria, said criteria comprising the component criterion that the elapsed time between a first one of the release times and an immediately preceding one of the depression times is greater than a preselected time interval;

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

    means, responsive to the key chord, for utilizing the key chord to select the one of the stored texts in the list of stored texts which corresponds to the key chord;

    means for setting the output signal to correspond to the selected one of the stored texts; and

    means for setting the output signal to correspond to the letters corresponding to the activated letter keys in the event the respective depression and release times fail to satisfy said criteria.

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