Low Cost Binaural System Based on the Echolocation

Moreira, Thiago Fernandes Moya; Lima, José; Costa, Paulo; Cunha, Marcio Rodrigues da

doi:10.1007/978-3-030-36150-1_6

Cited by 1 publication

(2 citation statements)

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“…Statistically insignificant differences between the transfer function amplitude and the amplitudes of the ultrasound signals were found in the corner case (p > 0.05). We obtained similar differences for the distance measurements compared to [13] when interpreting the ultrasound signal as a voltage level using the Hilbert transform.…”

Section: Analysis Of Ultrasound Signal By Modelling On Complex Variablementioning

confidence: 60%

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Analysis of Ultrasound Signal on Reflection from a Sharp Corner Surface: Study of Selected Characteristics Deriving from Regression by Transfer Function

2022

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This article deals with the regression analysis of the ultrasonic signal amplitude when the character of the reflection surface has been changed from a planar case to a sharp corner case. The experiment was performed at a measurement distance within the interval from 100 mm to 215 mm. A nonlinear correlation between the amplitude of the ultrasound signal and the measured distance was demonstrated. By analyzing the frequency spectra, a poor nonlinear correlation between the maximum frequency component and the distance vector was found for the sharp corner case versus the planar case, which proved similar nonlinear characteristics as the signal amplitude marker. The strong linear correlation in the distance difference vectors in the amplitude analysis of the ultrasound signal confirmed the hypothesis of a direct relationship between the reflection surface geometric characteristic and the polarity of the difference. The ultrasound signal was identified as a 3rd-order dynamic system. The nonlinear correlation of the steady-state values of the modelled transfer functions versus distance likewise shows the characteristic of the polarity difference or character derivative as a quantification marker of the characteristics of the reflection surface from the geometric point of view.

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Section: Analysis Of Ultrasound Signal By Modelling On Complex Variablementioning

confidence: 60%

“…At the same time, a significant difference in the analysis of the transfer function response was found in the direction of an increase in the rise time of the transient response by approximately 25% for the corner case versus the planar case. This postulate is fully supported by articles [1,6,7,[13][14][15].…”

Section: Discussionmentioning

confidence: 72%