Abstract
Voice control is becoming a popular technology for in-vehicle user interactions. One of the primary design issues of voice control systems is the accuracy of voice recognition. Providing a limited vocabulary set for user-system interactions is known to be a viable strategy for enhancing the system usability and user experience in voice interactions. From the human factors perspective, the development of such a vocabulary set of voice commands for system controls should be based on user intuitions rather than technical specifications. Previous researches were mostly focusing on the recognition of specifying trip destinations, less attention has been allocated on the overall interface controls of in-vehicle navigation systems.
This study aims to preliminarily explore potential patterns of the vocabulary choices of voice commands for in-vehicle navigation systems from the users’ perspective. Through a comprehensive market research, a set of 17 control functions, such as map orientation, zooming, navigation-related information, and general interface operations, of user interface interactions commonly used in modern in-vehicle navigation systems was instrumented for our experiments. Video clips showing the transitions of before-and-after scenario images for every control function were presented and prompted to experimental participants for their intuitions of the voice command vocabulary. All the intuitive voice commands collected for each control function were sorted in patterns of word cloud for further analysis. Post-experiment interviews were conducted for the subjective evaluation of the easiness of prompting voice commands and the possible reasons behind.
A total of 30 Mandarin-speaking subjects (19 males and 11 females) in Taiwan with at least 2 years of driving experience voluntarily participated in our experiment. A great discrepancy in the variety of vocabulary choices among control functions was demonstrated in our analysis. As our data indicated, for example, volume control functions (volume-up/-down/mute) are with the vocabulary choices with the most consistent results among participants, while the control functions regarding presenting detailed navigational information, such as real-time traffic situations and nearby POIs, were the poorest. Subjective preferences showed a slightly different pattern to the objective data in vocabulary choices. Recommendations to the voice interface design for in-vehicle navigation systems and future research venues are further discussed.
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Chen, AC., Li, MS., Lin, CY., Li, MC. (2020). User Vocabulary Choices of the Voice Commands for Controlling In-Vehicle Navigation Systems. In: Stephanidis, C., Antona, M., Ntoa, S. (eds) HCI International 2020 – Late Breaking Posters. HCII 2020. Communications in Computer and Information Science, vol 1294. Springer, Cham. https://doi.org/10.1007/978-3-030-60703-6_70
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