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. 2023 Feb 21;120(9):e2219394120. doi: 10.1073/pnas.2219394120

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Copyright © 2023 the Author(s). Published by PNAS.

This article is distributed under Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND).

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Fig. 2. — Functional flowcharts, images, and haptic feedback mechanisms for real-time vocal fatigue detection. (A) Block diagram for signal analysis and haptic feedback for energy dose, vocal intensity, vocal pitch, and heart rate. (B) Exploded-view illustration of the MA device. (C) Top/Bottom views of an MA device, skin adhesives that support magnetic coupling, and a picture of a device mounted on a subject. (D) Mechanism for mechanical coupling of the device to the body via a collection of small magnets embedded in the bottom encapsulation structure of the MA device and the skin adhesive. (E) Exploded-view illustration of the haptic device. (F) Bottom views of a haptic device with indicator light-emitting diodes and actuators. (G) Picture of a haptic device on the wrist.