Ingeniería en Electrónica y Telecomunicaciones

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    Diseño e implementación de un dispositivo electrónico para monitoreo y apoyo al diagnóstico de fonoaudiología en pacientes post COVID
    (Universidad de Cuenca, 2022-09-23) Guerrero Sarmiento, Mauricio Esteban; Paúl Vladimir, Llerena Orellana; Minchala Ávila, Luis Ismael
    This degree work develops and implements a device to aid in the diagnosis of speech therapy in post-COVID-19 patients by obtaining fundamental parameters of the voice through a sensor placed on the surface of the individual’s neck. The implementation of the device consists of 2 parts, hardware and software. The fundamental part of the hardware is the ESP32 module. It powers the circuit and controls the data handling. The second most important part of the circuit is the sensor used, which is an accelerometer BU-21771, which is robust to noise. For the sensor to work properly, a power supply, pre-amplification, amplification, filtering and data storage stages were designed. The software part, consists of a web server with several functions, one of them, allows to collect the data obtained through the sensor. These data are saved in the available storage, which allows downloading, deleting and visualizing the data through the server. The data obtained were processed by Praat software, in order to obtain the main parameters of the voice, and thus be able to perform a detailed acoustic analysis. The main parameters obtained are: fundamental frequency, intensity, phonation time, jitter, shimmer and HNR. To complement the analysis in Praat, there is the possibility of analyzing each of the parameters visually with acoustic images (oscillogram and spectrogram). The final device was tested on 21 post-COVID-19 individuals, 12 males and 9 females. Initial tests comparing the results of the device with a professional microphone showed that jitter, shimmer and HNR were the parameters that showed the most difference. Subsequent tests demonstrated the robustness of the accelerometer to noise with results similar to the first test. Finally, a comparison of the results of 10 of 21 individuals diagnosed by speech therapists with the data obtained by the device was performed. In conclusion, the prototype developed presents a certain margin of error with respect to a professional diagnosis, but it fulfills its objective of helping and complementing the speech therapist or voice specialist with the diagnosis through vocal analysis.