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1, while the letter Another drawback of prior art keyboards is the complexity of keys required to produce the modified forms of certain Arabic characters.
For example, an AWKL- user presses key 32 to type the Arabic letter I .
QWERTZ is widely used in Germany and much of Central Europe.
The same knowledge transfer is applicable to other close variants of QWERTY such as AZERTY, used in France and Belgium, and QZERTY, common in Italy.
A standard Latin alphabet keyboard layout most typists encounter when learning to type is the English keyboard layout known as QWERTY, shown in FIG.
2, which is named after the arrangement of the first six left letter keys of the top alphabet row on this keyboard.
A keyboard for inputting characters of a language selected from Arabic, Farsi and Urdu, said keyboard based on a mapping of a Latin alphabet keyboard onto one or more of said characters, wherein said mapping is based on:phonetic similarity between Latin alphabet characters and alphabet characters of said language; shape similarity within alphabet characters of said language; and lexicographic ordering of alphabet characters within said language.12.
The keyboard of claim 11, wherein for a Latin alphabet key associated with two or more Arabic characters, said Arabic characters are accessed sequentially by multiple presses of said Latin alphabet key, or by use of Function keys in association with said Latin alphabet key.14.
Whereas a user of the QKL or a Dvorak keyboard layout needs to be familiar with only 26 Latin alphabet keys, a user of prior art Arabic keyboard layouts is required to memorize at least 48 different key locations over two or more modes (i.e. TABLE 1 - Characters of the Arabic Script One of the most widely-used Arabic keyboard layouts, shown in FIG. As shown in Table 2, many Arabic letters have a phonetic counterpart in the Latin alphabet.
For example, although a QKL user typically memorizes most, or all, of the character key locations, the user is faced with the challenge of having to learn a fresh set of new key locations to type in Arabic-based script languages, such as Arabic, Farsi (Persian), Urdu, Pashto, etc.
This occurs even though the majority of the letters of the Arabic-based script are phonetically similar to a corresponding letter in the Latin alphabet.
When learning to type efficiently, users have to familiarize themselves with two particulars about the keyboard layout of interest: i) the location of every character-editing key on the keyboard, and ii) the proper hand and finger to use to signal or press a given key.
With adequate keyboard typing tutoring, typists can comfortably type at rates of 50 words per minute or greater. 1 shows the typical character printing keys available on most standard keyboards layouts, together with the ideal mapping of such keys to the eight character-typing fingers of a trained computer typist for maximizing touch-typing efficiency and typing throughput, together with the number of rows.