Speech Quality Analysis For Two-Ways Radio Subjected To Wind Induced Noise

Wind induced noise generated from winds flow over two-way radio can reduce communication effectiveness. There are three objectives in this study which are effect of the radio’s angle orientation toward air flow, sound quality analysis of speech signal under different wind speed and Intelligibility o...

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Main Author:	Hashim, Mohd Khairul Rabani
Format:	Thesis
Language:	English
Published:	2015
Subjects:	TJ1-1570 Mechanical engineering and machinery
Online Access:	http://eprints.usm.my/41145/1/MOHD_KHAIRUL_RABANI_BIN_HASHIM_24_Pages.pdf
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id	my-usm-ep.41145
record_format	uketd_dc
spelling	my-usm-ep.411452018-07-25T02:44:44Z Speech Quality Analysis For Two-Ways Radio Subjected To Wind Induced Noise 2015 Hashim, Mohd Khairul Rabani TJ1-1570 Mechanical engineering and machinery Wind induced noise generated from winds flow over two-way radio can reduce communication effectiveness. There are three objectives in this study which are effect of the radio’s angle orientation toward air flow, sound quality analysis of speech signal under different wind speed and Intelligibility of the received speech signal at different threshold hearing level. Measurement of sound quality for input signal was carried out inside an anechoic chamber by using LMS measurement system. Effect of the radio’s angle orientation toward air flow was studied by used a pair of radios where a unit was placed inside a wind tunnel and the other was placed inside the anechoic chamber in order to isolate it from external noise. Angle orientation of the transmitter radio was varying for seven positions ranges from 0° to 90° with 15° increment. Sound quality analysis of speech signal under different wind speed was carried out by located a speaker at a 30cm away from the transmitter to provide an speech signal input to the radio while the wind speed varied from 0 to 10 m/s with 2 m/s increment. Sound quality base on psychoacoustics parameters of sound pressure level, roughness, sharpness, loudness, annoyance and articulation index. Threshold controller was used to attenuate the background and winds induce noise from the received signal. It was controlled at 0 to 10% with 2& increment toward highest peak of the received signal. The results show the angle lead to worst wind noise effect was 90° toward leading edge. The results show that the loudness of the wind noise increase and the roughness decreases with the wind speed. The sharpness level is fluctuated along the measurement period. The articulation index xv also decreases with the wind speed. Combinations of psychoacoustics parameters are performing annoyance level which was increasing as the wind speed increase. The threshold controller’s performance was measured in sound pressure level and articulation index. Both of measurements show good development with the controller level. Conclusion, angle orientation of radio toward wind flow and the speed of wind are highly influent to sound quality of received signal. Threshold controller is one of the ways to reduce wind speed especially for low wind speed. 2015 Thesis http://eprints.usm.my/41145/ http://eprints.usm.my/41145/1/MOHD_KHAIRUL_RABANI_BIN_HASHIM_24_Pages.pdf application/pdf en public masters Universiti Sains Malaysia Pusat Pengajian Kejuruteraan Mekanik
institution	Universiti Sains Malaysia
collection	USM Institutional Repository
language	English
topic	TJ1-1570 Mechanical engineering and machinery
spellingShingle	TJ1-1570 Mechanical engineering and machinery Hashim, Mohd Khairul Rabani Speech Quality Analysis For Two-Ways Radio Subjected To Wind Induced Noise
description	Wind induced noise generated from winds flow over two-way radio can reduce communication effectiveness. There are three objectives in this study which are effect of the radio’s angle orientation toward air flow, sound quality analysis of speech signal under different wind speed and Intelligibility of the received speech signal at different threshold hearing level. Measurement of sound quality for input signal was carried out inside an anechoic chamber by using LMS measurement system. Effect of the radio’s angle orientation toward air flow was studied by used a pair of radios where a unit was placed inside a wind tunnel and the other was placed inside the anechoic chamber in order to isolate it from external noise. Angle orientation of the transmitter radio was varying for seven positions ranges from 0° to 90° with 15° increment. Sound quality analysis of speech signal under different wind speed was carried out by located a speaker at a 30cm away from the transmitter to provide an speech signal input to the radio while the wind speed varied from 0 to 10 m/s with 2 m/s increment. Sound quality base on psychoacoustics parameters of sound pressure level, roughness, sharpness, loudness, annoyance and articulation index. Threshold controller was used to attenuate the background and winds induce noise from the received signal. It was controlled at 0 to 10% with 2& increment toward highest peak of the received signal. The results show the angle lead to worst wind noise effect was 90° toward leading edge. The results show that the loudness of the wind noise increase and the roughness decreases with the wind speed. The sharpness level is fluctuated along the measurement period. The articulation index xv also decreases with the wind speed. Combinations of psychoacoustics parameters are performing annoyance level which was increasing as the wind speed increase. The threshold controller’s performance was measured in sound pressure level and articulation index. Both of measurements show good development with the controller level. Conclusion, angle orientation of radio toward wind flow and the speed of wind are highly influent to sound quality of received signal. Threshold controller is one of the ways to reduce wind speed especially for low wind speed.
format	Thesis
qualification_level	Master's degree
author	Hashim, Mohd Khairul Rabani
author_facet	Hashim, Mohd Khairul Rabani
author_sort	Hashim, Mohd Khairul Rabani
title	Speech Quality Analysis For Two-Ways Radio Subjected To Wind Induced Noise
title_short	Speech Quality Analysis For Two-Ways Radio Subjected To Wind Induced Noise
title_full	Speech Quality Analysis For Two-Ways Radio Subjected To Wind Induced Noise
title_fullStr	Speech Quality Analysis For Two-Ways Radio Subjected To Wind Induced Noise
title_full_unstemmed	Speech Quality Analysis For Two-Ways Radio Subjected To Wind Induced Noise
title_sort	speech quality analysis for two-ways radio subjected to wind induced noise
granting_institution	Universiti Sains Malaysia
granting_department	Pusat Pengajian Kejuruteraan Mekanik
publishDate	2015
url	http://eprints.usm.my/41145/1/MOHD_KHAIRUL_RABANI_BIN_HASHIM_24_Pages.pdf
_version_	1747820882179391488

Speech Quality Analysis For Two-Ways Radio Subjected To Wind Induced Noise

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