Hachisu Taku, Kajimoto Hiroyuki
IEEE Trans Haptics. 2017 Apr-Jun;10(2):288-295. doi: 10.1109/TOH.2016.2628900. Epub 2016 Nov 15.
We investigated the effect of vibration feedback latency on material perception during a tapping interaction using a rod device. When a user taps a surface, the perception of the material can be modulated by providing a decaying sinusoidal vibration at the moment of contact. To achieve this haptic material augmentation on a touchscreen, a system that can measure the approach velocity and provide vibration with low latency is required. To this end, we developed a touchscreen system that is capable of measuring the approach velocity and providing vibration feedback via a rod device with latency of 0.1 ms. Using this system, we experimentally measured the human detection threshold of the vibration feedback latency adopting a psychophysical approach. We further investigated the effect of latency on the perception of the material using a subjective questionnaire. Results show that the threshold was around 5.5 ms and the latency made the user feel that the surface is soft. In addition, users reported bouncing and denting sensations induced by the latency.
我们使用杆状设备研究了在敲击交互过程中振动反馈延迟对材料感知的影响。当用户敲击一个表面时，可以通过在接触瞬间提供一个衰减的正弦振动来调节对材料的感知。为了在触摸屏上实现这种触觉材料增强，需要一个能够测量接近速度并提供低延迟振动的系统。为此，我们开发了一个触摸屏系统，该系统能够测量接近速度并通过杆状设备提供延迟为0.1毫秒的振动反馈。使用该系统，我们采用心理物理学方法通过实验测量了振动反馈延迟的人体检测阈值。我们还使用主观问卷进一步研究了延迟对材料感知的影响。结果表明，阈值约为5.5毫秒，延迟会让用户感觉表面很软。此外，用户报告了由延迟引起的弹跳和凹陷感。
