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Nonlinear Analysis of Built-in Sensor in Smart Device under the Condition of Voice Actuating

School of Information Engineering, Wuhan University of Technology, Wuhan 430070, China
Author to whom correspondence should be addressed.
Future Internet 2019, 11(3), 81;
Received: 25 February 2019 / Revised: 12 March 2019 / Accepted: 15 March 2019 / Published: 26 March 2019
(This article belongs to the Special Issue Security and Privacy in Information and Communication Systems)
PDF [8355 KB, uploaded 26 March 2019]


A built-in sensor in a smart device, such as the accelerometer and the gyroscope, will produce an obvious nonlinear output when it receives voice signal. In this paper, based on the chaotic theory, the nonlinearity of smartphone built-in accelerometer is revealed by phase space reconstructing after we calculate several nonlinearity characteristics, such as best delay time, embedding dimension, and the attractor of accelerometer system, under the condition of voice commands inputting. The results of theoretical calculation and experiments show that this specific nonlinearity could lay a foundation for further signal extraction and analysis. View Full-Text
Keywords: built-in sensor; smart device; nonlinearity; phase space reconstruction built-in sensor; smart device; nonlinearity; phase space reconstruction

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Zhao, N.; Liu, Y.; Shen, J. Nonlinear Analysis of Built-in Sensor in Smart Device under the Condition of Voice Actuating. Future Internet 2019, 11, 81.

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