Abstract
This chapter describes techniques for midair vibrotactile stimulation based on ultrasound foci with temporally varied intensities or positions. This variation of the focal property is called modulations and can be categorized into three fundamental types of methods according to the modulating fashions and obtained vibrotactile effects: amplitude modulation (AM), lateral modulation (LM), and spatiotemporal modulation (STM). Appropriate modulation is useful in designing vibrotactile textures, enhancing the subjective strength of aroused sensation, and transmitting geometrical information about spatial vibrotactile patterns. The aim of this chapter is to provide a brief and simple overview of the main rendering techniques and to discuss their pros and cons, thus providing sufficient engineering insight to the haptics and human–computer interaction (HCI) readers.
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Hasegawa, K., Shinoda, H. (2022). Modulation Methods for Ultrasound Midair Haptics. In: Georgiou, O., Frier, W., Freeman, E., Pacchierotti, C., Hoshi, T. (eds) Ultrasound Mid-Air Haptics for Touchless Interfaces. Human–Computer Interaction Series. Springer, Cham. https://doi.org/10.1007/978-3-031-04043-6_9
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