Evaluation of smartphone ultrasonic airborne communication as regards acoustic environment
Résumé
Ultrasonic airborne communication has attracted a renewed interest in the past few years, thanks to the capability of mobile devices to emit and receive acoustic signals above the limit of the audible frequency range. One of the main applications under concern is the short-range data transmission. Given the variety of devices, and the absence of public data on their electroacoustic specifications, a numerical model of the whole transmission channel would lack reliable input parameters. The aim of this work is to set up a general methodology making it possible to evaluate the performances of ultrasonic airborne communication, particularly as regards the characteristics of a given acoustic environment. The proposed methodology based on impulse responses measurement can be implemented easily on any device and does not need a long measurement campaign. Once the application is loaded, a collection of impulse responses and ambient noise samples can be recorded in-situ. The performances of any modulation scheme can be studied afterwards using real noises and impulse responses, and by varying for instance the SNR. The robustness of the transmission can thus be evaluated a priori with realistic use conditions, taking into account both the electroacoustic response of the smartphone and the acoustic environment.
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