| 摘要 |
The present invention relates to a method of inputting alphanumeric codes by pressing no more than 2 keys on a keypad of 12 keys arranged in a matrix of 4 rows and 3 columns for each mode. It comprises a set of up to 12 tables arranging in a matric of 4 rows and 3 columns, each table containing 12 alphanumeric codes of identical or similar nature arranging in a matrix of 4 rows and 3 columns. To input an alphanumeric code, the user presses a key on the keypad in location corresponding to the location of the desired table in the matrix and then presses a key in location corresponding to the location of the desired code in the table. The invention can serve as a user interface for input of codes in handheld electronic devices or as a means for high level language communications among electronic devices.
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