2.2 The Characteristic of DTV
The major target of this paper is to implement a
system for providing an environment for testing to
students. Characteristics of digital TV are also
considered for providing adequate interfaces and
functions in order to help learners to evaluate their
learning performance. In this section, features of
applying digital TV in learning and design issues will
be discussed.
With differences of input device in digital TV and
computers, the design of interfaces must also be
modified. Users can move cursors by pressing
direction keys; confirm and cancel selections by
specified keys. Inputting strings is another problem for
users by using remote control. To input alphabets,
users need to press number keys rapidly until the target
alphabets appeared in the input boxes. Additional
devices like keyboard for set-top boxes may be used
for lowering inconvenience to users. Virtual keyboard
presented in frame of digital TV applications can be
also used to solve this problem. In this paper, the
solution used in mobile phone is adopted, users input
strings by switching number keys