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A Model of Public Announcement System’s Dynamics Control in Smart City Environments
Ante Grgat
,
Ivan Djurek
,
Mia Suhanek
Issue: Volume 3, Issue 4, December 2019
Pages: 112-116
Received: 13 November 2019
Accepted: 02 December 2019
Published: 17 December 2019
DOI:
10.11648/j.ajese.20190304.17
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Abstract: Nowadays, each individual is exposed to noise on a daily basis. Long exposure to noise pollution can be manifested through several health concerns such as bad mood, fatigue, insomnia, headache and loss of concentration, which can then cause reduced work ability and finally permanent hearing impairment. When considering urban areas, the most common type of noise source is traffic. Public announcement system are a vital and much needed part of every urban area and thus it should be constructed in a way that it delivers relevant information in a clear and understandable way while not disturbing the residents. Therefore, this paper proposes a model of public announcement system in urban places which aims to reduce unexpected and sudden loudness changes. The system is envisaged for public places, such as open bus stations surrounded with residential and commercial buildings. Several studies have shown that the residents of these buildings find sudden announcements very annoying and disturbing. The goal of this research is to reduce the sound level while retaining the principal loudness level. The study has shown that with the appropriate signal processing which includes a compressor and a limiter, these types of announcements can be made less annoying and disturbing for urban residents.
Abstract: Nowadays, each individual is exposed to noise on a daily basis. Long exposure to noise pollution can be manifested through several health concerns such as bad mood, fatigue, insomnia, headache and loss of concentration, which can then cause reduced work ability and finally permanent hearing impairment. When considering urban areas, the most common ...
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Acoustic Camera Design with Different Types of MEMS Microphone Arrays
Sanja Grubesa
,
Jasna Stamac
,
Mia Suhanek
Issue: Volume 3, Issue 4, December 2019
Pages: 88-93
Received: 03 September 2019
Accepted: 22 October 2019
Published: 06 December 2019
DOI:
10.11648/j.ajese.20190304.14
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Abstract: This paper investigates different approaches in designing an acoustic camera with respect to the shape of the camera as well as the number of microphones and their position on the camera. Micro electro-mechanical systems (MEMS) microphones are used in this research for the purpose of designing an acoustic camera. Several simulations implemented in MATLAB were performed for square MEMS microphone arrays, bearing in mind our primary goal, which is to design a broadband frequency range acoustic camera with MEMS microphones. In addition, a microphone array in the shape of a hemisphere was designed in order to compare all of the obtained results. Results gathered in the simulations have shown that using the square arrays and a hemispherical array enables us to construct four different broadband frequency range acoustic cameras. All of the considered versions of an acoustic camera have a respectable gain in the desired direction (i.e. the gain of the main lobe) and, in addition, a significant attenuation of side lobes. Keeping in mind the aforementioned requirements (i.e. the main lobe gain and attenuation of side lobes) it can be concluded that, from all of the considered designs, the best design is the acoustic camera with 24 MEMS microphone square array.
Abstract: This paper investigates different approaches in designing an acoustic camera with respect to the shape of the camera as well as the number of microphones and their position on the camera. Micro electro-mechanical systems (MEMS) microphones are used in this research for the purpose of designing an acoustic camera. Several simulations implemented in ...
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The Development and Analysis of Beamforming Algorithms Used for Designing an Acoustic Camera
Sanja Grubesa
,
Jasna Stamac
,
Ivan Krizanic
,
Antonio Petosic
Issue: Volume 3, Issue 4, December 2019
Pages: 94-102
Received: 08 November 2019
Accepted: 29 November 2019
Published: 06 December 2019
DOI:
10.11648/j.ajese.20190304.15
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Abstract: This paper discusses the beamforming algorithms used in developing an acoustic camera which can be used for the purpose of localizing sound sources. In order to design an acoustic camera which can display results in the form of an intensity map, it is necessary to determine the beamformed signal for all the desired incident angles, i.e. for all the desired pairs of azimuth and elevation angles. For the purpose of obtaining the beamformed signal required for localization of sound sources, two beamforming algorithms, which differ in the domain in which the beamforming is performed, were developed named respectively DASt.m and DASf.m. The aforementioned algorithms are implemented in the numerical computing environment MATLAB and furthermore compared in this paper. The beamforming was carried out using both of the aforementioned algorithms for all desired azimuth and elevation angle pairs and the obtained results were compared. In order to compare these two developed beamforming algorithms measurements were conducted in an open space using a Uniform Circular Array (UCA). The utilized UCA consists of 16 identical omnidirectional microphones which form a basic circular acoustic camera. The research showed that the DASf.m algorithm gives better results than the DASt.m algorithm, especially for the intensity maps of the average of the signal.
Abstract: This paper discusses the beamforming algorithms used in developing an acoustic camera which can be used for the purpose of localizing sound sources. In order to design an acoustic camera which can display results in the form of an intensity map, it is necessary to determine the beamformed signal for all the desired incident angles, i.e. for all the...
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Internet Security and Safety Learning via an Innovative Educational Game
Dora Puselj
,
Marin Vukovic
,
Mia Suhanek
Issue: Volume 3, Issue 4, December 2019
Pages: 84-87
Received: 13 November 2019
Accepted: 23 November 2019
Published: 04 December 2019
DOI:
10.11648/j.ajese.20190304.13
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Abstract: Nowadays, Internet safety is a very important topic in order to avoid unwanted consequences of various dangers, attacks and frauds. The Internet has over 3.5 billion users today and unfortunately Internet frauds and different types of attack have such a rapid increase that they are currently the most common form of crime. Some of the everyday possible threats to Internet users are frauds with unexpected cash winnings, frauds when buying or selling goods, false personation and personal information theft. Education and knowledge of certain internet safety measures are the first step to achieve at least a basic level of Internet safety. The aim of this paper is to make it easier and more fun to learn about Internet security and ways to protect your data. Thus, we propose an educational game for learning about the fundamentals of Internet safety through interaction with other characters and solving different problems. The proposed game is called Internet safety and it is implemented in the Unity game engine. It contains three levels and it is played by controlling the main character who solves problems and tries to find out the way to reach the next level or finish the game. The problems that need to be solved are some of the most common frauds and dangers possible to encounter while using the Internet.
Abstract: Nowadays, Internet safety is a very important topic in order to avoid unwanted consequences of various dangers, attacks and frauds. The Internet has over 3.5 billion users today and unfortunately Internet frauds and different types of attack have such a rapid increase that they are currently the most common form of crime. Some of the everyday possi...
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A Case Study: The Urban Residents’ Choice for Electric Vehicles Warning Sounds
Mia Suhanek
,
Ivan Djurek
,
Antonio Petosic
Issue: Volume 3, Issue 3, September 2019
Pages: 47-51
Received: 18 September 2019
Accepted: 15 October 2019
Published: 23 October 2019
DOI:
10.11648/j.ajese.20190303.11
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Abstract: Nowadays, people are exposed to noise on a daily basis. Therefore, in an overvibrant urban environments electrical vehicles operating at low speed are too quiet to be detected by pedestrians (especially vulnerable group are visually impaired people) and urban residents in general. Thus, electric vehicle warning sounds are sounds created to alert and warn pedestrians to the presence of electrical vehicles (e.g. hybrid electric vehicles, plug-in hybrid electric vehicles and all-electric vehicles) moving at low speeds. The goal of this paper is to determine through a case study what the pedestrians would desire and prefer the electrical vehicle warning audio signals to sound like. The case study involved 201 participants who had the task to fulfil a specially designed questionnaire for this purpose. Regarding the questionnaire, the participants were not prepared in any way for the testing they were just advised to keep in mind that the warning sound they select for the “role” of a pedestrian should not be irritable at the same time for the “role” of a driver. The results obtained from the questionnaire were analyzed and discussed in the paper. When speaking about the concept of smart cities and the legislation around the whole world today this is certainly a hot topic where the opinion of pedestrians and future drivers should not be overlooked.
Abstract: Nowadays, people are exposed to noise on a daily basis. Therefore, in an overvibrant urban environments electrical vehicles operating at low speed are too quiet to be detected by pedestrians (especially vulnerable group are visually impaired people) and urban residents in general. Thus, electric vehicle warning sounds are sounds created to alert an...
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