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IST-507802 TALK
D6.4 (Part I) 25 January 2007 Page 21/96
The next Figure 10 shows the frequency of tasks and free interaction periods, which were
processed consequently in one modality throughout the equivalent interactions. Speech input was
exclusively used relatively often with the SAMMIE system, much more frequently than iDrive.
Within the free interaction periods, however, speech and iDrive were used similarly frequently,
particularly with SAMMIE (s. explanation above).
Overall pure modality
100%
90%
SAMMIE
80%
C&C
70%
60%
57%
50%
tasks 4,5,9,10
40%
30%
25%
20%
22%
11%13%
19%
23%
13%
10%
0%
Speech
(tasks)
iDrive
(tasks)
Speech
(free)
iDrive
(free)
Figure 10: Overall pure
modality,
averaged over
tasks and Subjects
The next Figure 11 represents the frequencies of modality changes during the task processing (all
changes during task processing were counted). Subjects changed from speech to iDrive more
than twice as frequently than vice versa from iDrive to speech. By far the most frequent reason
for a change from speech to manual input were repeated rejections or false system reactions onto
speech input.
One of the reasons for a change from manual operation to speech input was e.g. in task 7:
Scrolling to the song ‘99 Luftballons’ manually and then copying to the playlist verbally. 18
Another reason was the unsuccessful manual search for a song/album/playlist in tasks 6, 7, 9 or
10 which led to a change to speech input.
Another result is, that much more changes (both directions) occurred with the C&C system.
Here, a change between modalities was easier, because both modalities were menu-based. (In the
baseline study there was a somewhat different mode of calculation.)
Changes to other modality
100%
SAMMIE
90%
C&C
80%
all SAMMIE tasks
70%
60%
60%
tasks 4,5,9,10
50%
40%
32%
28%
30%
20%
14%
10%
0%
changes to iDrive
Figure 11: Modality changes
during tasks,
averaged across
tasks and Subjects
changes to speech
The next Figure 12 demonstrates the preferred modality for the levels of MP3 experience,
averaged over systems and Subjects of the MP3 level groups. Experienced Subjects preferred
clearly more speech than the less experienced Subjects and vice versa for iDrive. The result of
18
Though having learned the manual (but not obvious) copying into the playlist, s. chapter 2.6.
Version: Final 1.1, Distribution: public