WO2000038041A1 - Systeme de clavier pour dispositif informatique dote d'une correction des erreurs d'entree dues au clavier - Google Patents

Systeme de clavier pour dispositif informatique dote d'une correction des erreurs d'entree dues au clavier Download PDF

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Publication number
WO2000038041A1
WO2000038041A1 PCT/GB1999/004321 GB9904321W WO0038041A1 WO 2000038041 A1 WO2000038041 A1 WO 2000038041A1 GB 9904321 W GB9904321 W GB 9904321W WO 0038041 A1 WO0038041 A1 WO 0038041A1
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WO
WIPO (PCT)
Prior art keywords
keys
key
dictionary
word
letters
Prior art date
Application number
PCT/GB1999/004321
Other languages
English (en)
Inventor
Nicholas Healey
Original Assignee
Symbian Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Symbian Limited filed Critical Symbian Limited
Publication of WO2000038041A1 publication Critical patent/WO2000038041A1/fr

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/02—Input arrangements using manually operated switches, e.g. using keyboards or dials
    • G06F3/023—Arrangements for converting discrete items of information into a coded form, e.g. arrangements for interpreting keyboard generated codes as alphanumeric codes, operand codes or instruction codes
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F40/00—Handling natural language data
    • G06F40/20—Natural language analysis
    • G06F40/232—Orthographic correction, e.g. spell checking or vowelisation

Definitions

  • This invention relates to keyboard systems, and in particular to keyboard systems for computing devices which can detect and correct key-based input errors.
  • the term 'key' used in this patent specification should be expansively construed to cover any form of input system which a user touches, presses or otherwise selects in order to identify a letter, number or function. It covers, without limitation, the numeric and alphameric keys of a mechanical keyboard, a soft key array and a touch panel.
  • a 'keyboard' as used in this specification is a collection of such 'keys'.
  • the term 'computing device' used in this patent specification should be expansively construed to cover any form of electrical device and includes computers of any form factor, including handheld and personal computers, and communication devices of any form factor, including mobile telephones, smart phones, communicators which combine communications and computing functionality into a single device and other kinds of wireless and wired information devices.
  • Sophisticated word processing programs such as Microsoft Word include advanced spell check programs which can compare words input to a computer using a conventional
  • Spell check programs are also found in hand held, self contained units, such as those from Franklin Computer Corporation. Spell-check programs have been the subject of intense scrutiny for several decades and many different approaches have been devised for effective spell-checking. Reference, for example, may be made to US 5248536 in the name of Franklin Electronic Publishers, Inc. which discloses a spell-check program which includes comparing an input word to a dictionary using phonetic comparison, typographic comparison, vowel and consonant typographic comparison and consonant phonetic comparison. The exact form of comparison which is undertaken in contemporary spell check programs involves sophisticated pattern matching algorithms which are disclosed in the literature.
  • Touch screen keyboards such as are used in personal organisers and some communicators, are particularly prone to mis-hits because of the small size of the keyboard and the absence of discrete keys.
  • Reduced keyboards for example incorporating nine keys, each being labelled with three letters, are one solution to the problems posed by text entry to small hand held devices. Reference may for example be made to US 5818437 to Tegic Communications, Inc. Reduced keyboard systems, however, do not compensate for accidentally hitting a key adjacent to the correct key.
  • a method of correcting a key based input to a computing device using keys of a keyboard includes the step of determining the keys adjacent to the keys actually struck or selected.
  • the key based input may relate to letters.
  • the method of the present invention would include the step of determining that the letter 'x' lay adjacent to the letters 'c' and 'z', assuming that a conventional QWERTY keyboard had been used. That determination can be used in a variety of ways. For example, it could be used to weight the results obtained through conventional pattern matching spell check techniques, so that the word 'car' was presented as the first, or in some embodiments, the only 'correct' substitution. Prior art systems do not compensate for key mis-hits in this manner, or at all.
  • the key input may also not relate to letters at all. Keyboards on small computing or communications devices are very crowded and mis-selection of menu items is easy: for example, the on-screen menu on a primarily numeric keypad might dictate hitting any of the numbers T, '2' or '3' to select one of three different options. If the key for number '4' is accidentally mis-hit instead of T, then in one embodiment, the step of determining the keys adjacent to the key actually struck occurs. This enables the embodiment to determine that in all likelihood the user intended to strike key ' 1 '.
  • the present invention envisages a method in which, if there is more than one word located in the dictionary process (whether or not that process uses any of the sophisticated pattern matching techniques found in conventional spell-check programs), then there is a further step of determining which word located in the dictionary look-up process includes the highest number of letters actually hit. It is that word that may be made the highest priority suggested or automatic substitution.
  • both 'foal' and 'soak' and 'dial' are possible words.
  • the ambiguity relating to which of these 3 words was intended can be resolved by determining which of these words includes the highest number of letters actually hit.
  • the word 'soak' would be correctly identified, since it has 3 letters actually hit compared to 'foal' and 'dial', which each have 2 letters.
  • one of the inventive steps is that there is a determination of the keys on the same row which are adjacent to the keys actually struck or selected.
  • this principle is extended to cover a determination of keys which are merely nearby to the keys actually struck, such as keys which are next door but one on the same row, and keys which are on different rows but are nevertheless adjacent. Weighting of the significance of hitting such keys may also be used, with keys adjacent and on the same row being given the highest weighting.
  • the keyboard may be extended by the inclusion of extra blank keys at each end of each row.
  • the embodiment determines that the correct key should be the key 'Q'.
  • monitoring of the exact touch position may also occur. This enables weighting of the proximate letters closest to the actual contact position.
  • contact positions for any one key may be resolved using an 8x8 grid touch sensitive grid overlying the display, with all keys being defined by their own 8x8 grid.
  • the touched gird defines the letter 'H' on a QWERTY keyboard, but the actual contact position is clearly closer to 'G' than T on the 8x8 grid, then the letter 'G' can be weighted more heavily in the word selection process.
  • the system might select the 'c' in 'cvat' and perform the look-up against 'cat'.
  • the system could select the V in 'cvat' and perform the look-up against 'vat'.
  • the system of the present invention may be adapted so that dictionary words which are very rarely used are subject to the letter substitution techniques described above.
  • the word 'See' may be incorrectly input as the word 'Dee' because of a mishit of the letter 'D' instead of 'S'.
  • a conventional spell-check program might pass this if it contained the unusual word 'Dee' in its dictionary (it is the name of a British river).
  • the word 'Dee' is classified as an unusual word, so that the embodiment automatically applies letter substitution to generate the more common word 'See'.
  • the more common word 'See' is then offered as a potential substitution, or may be automatically input.
  • mis-hitting may vary from one part of the keyboard to another.
  • N-grams would require less memory, and be an intrinsically faster algorithm than a dictionary based approach.
  • Feedback to the user can also be provided, indicating the proposed word correction. This enables the user to correct the proposed correction in an efficient manner, and also to modify the data structures used in the word validation process. In this way, the process can be an adaptive one.
  • a computing device operable to perform the above inventive methods
  • pre-recorded media programmed with software to perform the above inventive methods
  • a computer program operable to perform the above inventive methods.
  • Appendix 1 This section describes a number of algorithms for implementing the present invention. Each is documented in 'pseudo-code', which should be translatable into most programming languages by a competent programmer.
  • This algorithm uses the nearest match routine that is to be found with many dictionary systems.
  • word$ Obtain word from keyboard input Look up word$ in dictionary
  • DisposeDictionary (less) ; ⁇ Dispose of the grea ter sub-tree ⁇ DisposeDictionary (more) ;
  • Procedure LoadDictionary (Const FileName: String) ; ⁇ Loads the dictionary from, a file of words . Each word must be one per line, with no spaces .
  • This embodiment is a very restricted one, designed to show the principles .
  • i t only handles tne letters on a standard keybaord.
  • the al gori thm is tha t of subsi tu ting each neighbouring key for each letter, to find al l rela ted varien ts in the dictionary . ⁇
  • Var testWord possibles: String; letter : Char; i, j : Integer; Begin
  • testWord[i] Neighbours [letter] [j ] ; ⁇ If i t is in our di ctionary. . . ⁇
  • This routine also illustrates the option of determining the most likely word as being the one with the minimum transformations .
  • This routine could also handle the one-key error case. ⁇
  • TryWordTransf orm returns all words it can genera te which are in the dictionary. This algorithm is recursive because we do not know in advance how long the word is going to be.
  • TryWordTransform possibles; End; End; Begin
  • MultipleKeyErrorCheck TryWordTransform (1, 0, inputWord); WriteLn; End;
  • TestWord String; begin ⁇ Keypad ⁇

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Human Computer Interaction (AREA)
  • Artificial Intelligence (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • Computational Linguistics (AREA)
  • General Health & Medical Sciences (AREA)
  • Machine Translation (AREA)
  • Document Processing Apparatus (AREA)

Abstract

On décrit un procédé de correction d'une entrée par touche sur un dispositif informatique comprenant un clavier, qui consiste à déterminer les touches adjacentes aux touches véritablement frappées ou sélectionnées. Par conséquent, si le mot 'car' est accidentellement entré sous la forme 'xar', la présente invention comprend l'étape de détermination que la lettre 'x' est immédiatement voisine des lettres 'c' et 'z', en supposant qu'un clavier classique QWERTY a été utilisé. Cette information peut être utilisée pour corriger automatiquement les fautes de frappe.
PCT/GB1999/004321 1998-12-19 1999-12-20 Systeme de clavier pour dispositif informatique dote d'une correction des erreurs d'entree dues au clavier WO2000038041A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9827930.0 1998-12-19
GBGB9827930.0A GB9827930D0 (en) 1998-12-19 1998-12-19 Keyboard system for a computing device with correction of key based input errors

Publications (1)

Publication Number Publication Date
WO2000038041A1 true WO2000038041A1 (fr) 2000-06-29

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