Thesis - Teknisk Design

click of a button must be analyzed. It is quite a long feedback when you touch abutton because you have to realize the whole course of the button to activate it.That is why a long pulse was chosen.The specific feedback is number 15 in the list of haptic feedback from thelibrary of Immersion (Appendix I). The summary of haptic feedback number 15 isshown in the table 3.4.Number of effects Type of effect Wideness of pulse Power percentageTwo effects Click Effect Wide pulse 100% powerTable 3.4 Summary of the haptic feedback number 15Not-Activated ActionThe approach to the not-activated action confirmation feedback must be reallydifferent to the activated one. The reason is that in this case, the physical buttondoes not produce any haptic feedback; there is just lack of it. But it was chosen tohave a haptic feedback in this case for the virtual button for the reasons that wereexplained before in this text. First, to have a link between the two confirmation hapticfeedbacks a click effect was chosen. As it is impossible to look for the physical hapticfeedback, it would be nice to look for other kinds of feedback regarding the samesituation. When looking at auditory feedback for not-activated action a buzz is oftenused, a repeated and short feedback. Translating these into the librarycharacteristics it means that the feedback must be a narrow pulse and it has to berepeated at three times that it is the highest number of repetitions.The specific feedback is number 21 in the list of haptic feedback from thelibrary of Immersion (Appendix I). The summary of haptic feedback number 21 isshown in the table 3.5.Number of effects Type of effect Wideness of pulse Power percentageThree effects Click Effect Narrow pulse 100% powerNAVIGATION FEEDBACKTable 3.5 Summary of the haptic feedback number 21In comparison to the confirmation feedbacks, navigation feedbacks have to besimpler. The reason is that they are repeated over time when the user is making anychange on the position of the finger in the screen. That is why the vast majority of thenavigation feedbacks are composed by one effect.Navigation across ItemsThe navigation across items feedback must be not really sharp. The reason is thatfeedback repeated a lot of times at sharp vibration could be annoying after a while.Also, it might be taken into consideration the fact that vibrator fibre nerves are quickadapting and patterns must not be followed to be able to notice the hapticfeedback for the necessary time. A single bounce effect combined with the factthat haptic feedback just appears when finger position is changed seems to matchall the requisites. There is no possibility to regard the physical haptic feedback to37