Abstract
Cars have utilized speech recognition and guidance for navigation systems from the early 2000s, however, the complicated mixture of multi-mode controls, such as a switch, touch panel, and speech, continues to be problematic. In this paper, we first discuss the problems with the conventional design of speech interface as equipped on a vehicle. Furthermore, to make clear the effect of equipping a spoken dialogue system, we experimentally compare the speech interface that includes natural language understanding (NLU) and spoken dialogue management (SDM) technology with the conventional speech command interface type of input. According to our evaluation, the total task and response times against LED stimuli showed significant differences for the command input type navigation system when compared with the other two speech interface types. The NLU- and NLU/SDM- type systems showed a quicker response time for each task than the command input system.
