Text_Entry.ppt 554KB Jun 23 2011 12:32:46 PM
New Interaction
Techniques
Text
Entry
Grigori Evreinov
Department of Computer
Sciences
University of Tampere,
www.cs.uta.fi/~grse/
Finland
September – December, 2003
Text
Entry
“ Alphabet - an ordered set of sound signs - named
after first
two letters in the Greek: alpha-beta [alef-bet]
a set of graphem-phoneme correspondences which allow a graphic shape
to serve as a sound sign or phonogram
in an ideal alphabet there is one and only one letter or symbol for each
important sound in the language ”
thus, alphabet wasn’t intended to write fast as possible, but it should
provide the high degree of reading comprehension of the message
semantics
“ Unifon
means one sound and indicates one sound per symbol
in many writing systems there is only one sound per symbol
in English there are over 14 sounds per symbol
the English writing system has 106 symbols for 40 or so sounds
the problem is that the same symbol can refer to more than one sound
”
http://66.41.60.21/Why 20English is Absurd.htm
TAUCHI MMIG
G. Evreinov
01_21
21.11.2003
a typing speed with conventional QWERTY keyboard is
Text
about
200-300Entry
500 characters per minute or ~40-60-150 wpm
this technique requires two healthy hands and 27 reliable keys
mobile devices like phones, remote control or PDA operate with a smaller
number of physical keys most often 12 and use special combinatorial
methods for text entry
this is primarily one-hand technique and requires 1-12 keys
a single-switch user can type with a rate around 3-22 char/m (1-4.5 wpm)
too few keys slows typing by requiring multiple keystrokes to make some
characters and
too many keys slows typing by making it harder to coordinate hands, to
remember non-periodical long layout to find a specific key
visual feedback decreases cognitive loading
but sometimes visual feedback is impossible
TAUCHI MMIG
G. Evreinov
02_21
21.11.2003
Text
Entry
t, s
96%
5.0
80%
2.0
50%
1.0
20%
0.5
4%
0.2
0.1
1%
0.1 0.2 0.5 1.0 2.0 5.0 10.0
k, char/s
6.0 12 30 60 120 300 600
k, char/m
1.2 2.4 6.0 12 24
k, wpm
60 120
the relation between the minimum necessary Keystroke Saving Rate (KSR, %),
typing speed (characters per second /char/s) and selection time (t, in s)
that is, which KSR will be necessary to increase text entry speed for given typing
speed k and time t used for making the selection process
adapted from [14] Zagler, W.I. Matching Typing Persons and Intelligent Interfaces.
TAUCHI MMIG
G. Evreinov
03_21
21.11.2003
Key
KSPCtyping
2.75 2.524
2.5
2.327 2.262
2.25
KSPC
2.109 2.034
2
1.75
1.5
1.25
1
0.75
Text
Entry
KSPAlphabet
2
KSper Alphabet
90
80
70
60
1.824
50
1.503 1.441
40
1.293 1.248
30
20
1
10
0
Key Codes
~30 40-50
Techniques
Text
Entry
Grigori Evreinov
Department of Computer
Sciences
University of Tampere,
www.cs.uta.fi/~grse/
Finland
September – December, 2003
Text
Entry
“ Alphabet - an ordered set of sound signs - named
after first
two letters in the Greek: alpha-beta [alef-bet]
a set of graphem-phoneme correspondences which allow a graphic shape
to serve as a sound sign or phonogram
in an ideal alphabet there is one and only one letter or symbol for each
important sound in the language ”
thus, alphabet wasn’t intended to write fast as possible, but it should
provide the high degree of reading comprehension of the message
semantics
“ Unifon
means one sound and indicates one sound per symbol
in many writing systems there is only one sound per symbol
in English there are over 14 sounds per symbol
the English writing system has 106 symbols for 40 or so sounds
the problem is that the same symbol can refer to more than one sound
”
http://66.41.60.21/Why 20English is Absurd.htm
TAUCHI MMIG
G. Evreinov
01_21
21.11.2003
a typing speed with conventional QWERTY keyboard is
Text
about
200-300Entry
500 characters per minute or ~40-60-150 wpm
this technique requires two healthy hands and 27 reliable keys
mobile devices like phones, remote control or PDA operate with a smaller
number of physical keys most often 12 and use special combinatorial
methods for text entry
this is primarily one-hand technique and requires 1-12 keys
a single-switch user can type with a rate around 3-22 char/m (1-4.5 wpm)
too few keys slows typing by requiring multiple keystrokes to make some
characters and
too many keys slows typing by making it harder to coordinate hands, to
remember non-periodical long layout to find a specific key
visual feedback decreases cognitive loading
but sometimes visual feedback is impossible
TAUCHI MMIG
G. Evreinov
02_21
21.11.2003
Text
Entry
t, s
96%
5.0
80%
2.0
50%
1.0
20%
0.5
4%
0.2
0.1
1%
0.1 0.2 0.5 1.0 2.0 5.0 10.0
k, char/s
6.0 12 30 60 120 300 600
k, char/m
1.2 2.4 6.0 12 24
k, wpm
60 120
the relation between the minimum necessary Keystroke Saving Rate (KSR, %),
typing speed (characters per second /char/s) and selection time (t, in s)
that is, which KSR will be necessary to increase text entry speed for given typing
speed k and time t used for making the selection process
adapted from [14] Zagler, W.I. Matching Typing Persons and Intelligent Interfaces.
TAUCHI MMIG
G. Evreinov
03_21
21.11.2003
Key
KSPCtyping
2.75 2.524
2.5
2.327 2.262
2.25
KSPC
2.109 2.034
2
1.75
1.5
1.25
1
0.75
Text
Entry
KSPAlphabet
2
KSper Alphabet
90
80
70
60
1.824
50
1.503 1.441
40
1.293 1.248
30
20
1
10
0
Key Codes
~30 40-50