Nowadays, tactile surfaces, such as smartphones, provide haptic feedback to signify that a task has been performed correctly or more generally to enrich the interaction. However, this haptic feedback induces vibrations in the surface that propagate to the whole surface, reverberate and attenuate, thus making multi-finger interaction, with different feedbacks, difficult. Recently, the Inverse Filter Method has been proposed to control the propagation of these vibrations, and thus enable to product localized multitouch on a glass surface. This way, a user can put several fingers on a tactile surface and yet feel stimuli independently on his/her different fingers. This article continues this work and demonstrates that a localized multitouch haptic feedback can be delivered in real time using a capacitive screen. To achieve this, this article presents the two necessary steps: a calibration step and an interpolation calculation in order to save calculation and learning time. Furthermore, the paper describes the performance of the device through a study on the behaviour of the screen subjected to the Inverse Filter Method, indicating the movement of the whole screen and the voltage requirement for any haptic feedback.

中文翻译：

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通过逆滤波技术在触觉屏幕上实现多点触控振动触觉反馈：振动幅度和空间分辨率

如今，触觉表面（例如智能手机）提供触觉反馈以表示任务已正确执行或更广泛地执行以丰富交互。然而，这种触觉反馈会在表面引起振动，振动会传播到整个表面，产生回响和衰减，从而使具有不同反馈的多指交互变得困难。最近，已经提出了逆滤波方法来控制这些振动的传播，从而能够在玻璃表面上产生局部多点触控。通过这种方式，用户可以将几个手指放在一个触觉表面上，同时在他/她的不同手指上独立地感受到刺激。本文继续这项工作，并演示了可以使用电容屏实时提供局部多点触控触觉反馈。为了达成这个，本文介绍了两个必要步骤：校准步骤和插值计算，以节省计算和学习时间。此外，该论文通过对受逆滤波方法影响的屏幕行为的研究来描述设备的性能，表明整个屏幕的运动和任何触觉反馈的电压要求。