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Method and device for character input by direction key

  • US 9,524,035 B2
  • Filed: 12/17/2009
  • Issued: 12/20/2016
  • Est. Priority Date: 11/25/2009
  • Status: Active Grant
First Claim
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1. A method for character input by arrow keys, wherein, a mapping relationship between characters in an input character set and a sequence of arrow keys input is constructed, and at least one code table is established to indicate said mapping relationship;

  • a character is input by code table selection keys and arrow keys, the method comprising;

    determining a current code table according to the input of the code table selection keys;

    displaying a prompt message of the current code table on a display screen;

    displaying characters that have already been input on the display screen; and

    displaying a current key input of the sequence of arrow keys that have been input on the display screen;

    determining the character input in the current code table according to the sequence of arrow keys input;

    wherein, the mapping relationship between the characters in the input character set and the sequence of arrow keys input is that;

    the characters in the input character set is distributed over every code table;

    that every character in every code table is assigned a different code value C;

    that for every code table, different sequence of arrow keys input is mapped with a different code value C, wherein the code value C is a number;

    wherein, a corresponding relationship between the sequence of arrow keys, a vector S=(S1, S2, . . . , Sn), input and the code value C in every code table is;

    if an i-th arrow key is assigned a key-value Si, a row vector S that consist of key-values of the keys in the sequence of arrow keys input has a linear relationship with the code value C;

    C=S×

    BT, wherein B is a coefficient vector of a corresponding dimension, and a superscript “

    T”

    represents “

    transpose”

    .

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