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Preliminary study: mobile phone as a phonocardiographic signal recorder 初步研究：手机作为心电信号记录器
IF 0.5
International Journal of Electronics and Telecommunications Pub Date : 2024-07-25 DOI: 10.24425/ijet.2024.149588
Michał Łuczyński
{"title":"Preliminary study: mobile phone as a phonocardiographic signal recorder","authors":"Michał Łuczyński","doi":"10.24425/ijet.2024.149588","DOIUrl":"https://doi.org/10.24425/ijet.2024.149588","url":null,"abstract":"The aim of this paper is to analyze the possibility of using a mobile phone with a voice recorder function as a phonocardiographic signal recorder. Test measurements were carried out by placing the phone at various points on the chest. For one selected point, measurements were carried out for a group of 120 people, using different models of mobile phones. Data on weight, height and age were collected through a survey. Participants of the study were also asked about diagnosed heart defects and potential problems related to the measurement. Signal quality was assessed using quality parameters. It was checked how the selected methods of signal pre-processing (editing of recordings, filtering) affect the values of quality parameters. The obtained recordings were subjected to automatic signal classification. The result of this work is an extended analysis of the use of mobile phones as electronic stethoscopes and an analysis of the usefulness of signals obtained using this measurement method. The results of these studies are important for the field of medical diagnostics, especially in situations where access to traditional stethoscopes is limited. If mobile phones prove to be effective recorders of phonocardiographic signals, it will open new possibilities in the field of remote heart monitoring and telemedicine. However, it should be noted that further research, including validation and comparison of results obtained with mobile phones with those obtained with traditional stethoscopes, is needed before this technology is introduced into clinical practice.","PeriodicalId":13922,"journal":{"name":"International Journal of Electronics and Telecommunications","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141804488","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Bandwidth enhancement of circular structure microstrip antenna based on inverted C-shaped ground configuration 基于倒 C 形接地配置的圆形结构微带天线带宽增强技术
IF 0.5
International Journal of Electronics and Telecommunications Pub Date : 2024-07-25 DOI: 10.24425/ijet.2024.149593
Siswo Wardoyo, Jaka Permana, Toto Supriyanto, Muh. Wildan, Febrizal, S. Alam, Teguh Firmansyah
{"title":"Bandwidth enhancement of circular structure microstrip antenna based on inverted C-shaped ground configuration","authors":"Siswo Wardoyo, Jaka Permana, Toto Supriyanto, Muh. Wildan, Febrizal, S. Alam, Teguh Firmansyah","doi":"10.24425/ijet.2024.149593","DOIUrl":"https://doi.org/10.24425/ijet.2024.149593","url":null,"abstract":"Designing microstrip antennas with wide bandwidth and low-frequency capabilities presents several challenges. These difficulties mainly arise due to the relatively small size of the microstrip in comparison to the operating frequency. Therefore, achieving a combination of enhanced bandwidth and lowerfrequency cut-off becomes crucial to support a broad frequency range of communication technologies. This paper presents a method for enhancing the bandwidth of a circular microstrip antenna based on an inverted C-shaped ground configuration. The proposed method successfully creates an antenna with extended bandwidth while lowering the operating frequency. The antenna was simulated and then fabricated using an RO5880 duroid substrate with a relative permittivity of 2.2, a thickness of 1.575 mm, and a loss tangent of 0.0009. The simulation and measurement results demonstrate that the antenna can operate effectively within a wide frequency range of 3.5 GHz to 18 GHz. Additionally, utilizing this method enables the antenna to function at even lower frequencies and wider bandwidth without the need for additional dimensions.","PeriodicalId":13922,"journal":{"name":"International Journal of Electronics and Telecommunications","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141802202","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Sound power level as a measure of efficiency of Distributed Mode Loudspeakers 衡量分布式扬声器效率的声功率级
IF 0.5
International Journal of Electronics and Telecommunications Pub Date : 2024-07-25 DOI: 10.24425/ijet.2024.149581
Karol Czesak, Piotr Kleczkowski
{"title":"Sound power level as a measure of efficiency of Distributed Mode Loudspeakers","authors":"Karol Czesak, Piotr Kleczkowski","doi":"10.24425/ijet.2024.149581","DOIUrl":"https://doi.org/10.24425/ijet.2024.149581","url":null,"abstract":"Distributed Mode Loudspeakers (DMLs) are characterized by properties, which make them significantly different from conventional electrodynamic loudspeakers. Such differences occur due to the design assumptions of the DML. In this work, a series of SPL measurements of DML in a reverberation chamber has been carried out, which were compared with those for an electrodynamic loudspeaker. Sound power level was determined from the results of conducted measurements for both types of transducers. It was calculated in 1/3 octave bands, for the pink noise excitation. The sound power level obtained with these two different types of loudspeakers is not significantly differing between each other.","PeriodicalId":13922,"journal":{"name":"International Journal of Electronics and Telecommunications","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141803130","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Profile Analysis: A framework for the study of auditory sound spectrum analysis 剖面分析：听觉声谱分析研究框架
IF 0.5
International Journal of Electronics and Telecommunications Pub Date : 2024-07-25 DOI: 10.24425/ijet.2024.149583
Jan Żera
{"title":"Profile Analysis: A framework for the study of auditory sound spectrum analysis","authors":"Jan Żera","doi":"10.24425/ijet.2024.149583","DOIUrl":"https://doi.org/10.24425/ijet.2024.149583","url":null,"abstract":"Profile Analysis (PA) is a research approach developed by David M. Green and his associates, aimed at measuring listeners’ ability to discern changes in the spectral envelope shape of complex tones. PA introduces an innovative method by separating across-frequency spectral envelope shape comparisons within a complex tone and across-time level comparisons within specific frequency channels. This paper revisits the outcomes of several PA studies and examines the correlations between PA and the results obtained from experiments involving harmonic signals and listening tests designed to enhance timbre evaluation skills among sound engineering students at the Chopin University of Music in Warsaw.","PeriodicalId":13922,"journal":{"name":"International Journal of Electronics and Telecommunications","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141804832","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A new efficient predictor blending lossless image coder 新型高效预测混合无损图像编码器
IF 0.5
International Journal of Electronics and Telecommunications Pub Date : 2024-07-25 DOI: 10.24425/ijet.2024.149601
G. Ulacha, R. Stasinski
{"title":"A new efficient predictor blending lossless image coder","authors":"G. Ulacha, R. Stasinski","doi":"10.24425/ijet.2024.149601","DOIUrl":"https://doi.org/10.24425/ijet.2024.149601","url":null,"abstract":"In the paper a highly efficient algorithm for lossless image coding is described. The algorithm is a predictor blending one, a sample estimate is computed as a weighted sum of estimates given by subpredictors, here 27 ones, hence the name Blend-27. Data compaction performance of Blend-27 is compared to that of numerous other lossless image coding algorithms, including the best currently existing ones. The compared methods are ”classical” ones, as well as those based on Artificial Neural Networks. Performance of Blend-27 as a near-lossless coder is also evaluated. Its computational complexity is lower than that of majority of its direct competitors. The new algorithm appears to be currently the most efficient technique for lossless coding of natural images.","PeriodicalId":13922,"journal":{"name":"International Journal of Electronics and Telecommunications","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141804840","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The analysis of the metrological propertiesof contact temperature measurement with the use of selected statistical methods 利用选定的统计方法分析接触温度测量的计量特性
IF 0.5
International Journal of Electronics and Telecommunications Pub Date : 2024-07-25 DOI: 10.24425/ijet.2024.149589
Dariusz Michalski, Beata Maciejewska, M. Piasecka, Norbert Dadas, Artur Piasecki
{"title":"The analysis of the metrological propertiesof contact temperature measurement with the use of selected statistical methods","authors":"Dariusz Michalski, Beata Maciejewska, M. Piasecka, Norbert Dadas, Artur Piasecki","doi":"10.24425/ijet.2024.149589","DOIUrl":"https://doi.org/10.24425/ijet.2024.149589","url":null,"abstract":"In this study, the uncertainty of measurement paths was estimated using selected statistical methods. Specifically, temperature measurements obtained from contact temperature sensors used in a heat transfer test section were investigated. The experiments utilized a drywell temperature calibrator, thermoelements (types K, J, N, and T), and a data acquisition station. Additionally, a certified Pt-100 resistance sensor connected to the temperature meter was considered during measurements. The temperature range for the selected measurement points was 0.3 to 100 °C, covering both increasing and decreasing temperatures. To calculate the expanded uncertainty, both the uncertainty propagation method and the Monte Carlo method were employed. The results were analyzed and found to be similar.","PeriodicalId":13922,"journal":{"name":"International Journal of Electronics and Telecommunications","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141806250","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Amplitude spectrum correction to improve speech signal classification quality 振幅频谱校正提高语音信号分类质量
IF 0.5
International Journal of Electronics and Telecommunications Pub Date : 2024-07-25 DOI: 10.24425/ijet.2024.149580
Stanislaw Gmyrek, Robert Hossa, Ryszard Makowski
{"title":"Amplitude spectrum correction to improve speech signal classification quality","authors":"Stanislaw Gmyrek, Robert Hossa, Ryszard Makowski","doi":"10.24425/ijet.2024.149580","DOIUrl":"https://doi.org/10.24425/ijet.2024.149580","url":null,"abstract":"The speech signal can be described by three key elements: the excitation signal, the impulse response of the vocal tract, and a system that represents the impact of speech production through human lips. The primary carrier of semantic content in speech is primarily influenced by the characteristics of the vocal tract. Nonetheless, when it comes to parameterization coefficients, the irregular periodicity of the glottal excitation is a significant factor that leads to notable variations in the values of the feature vectors, resulting in disruptions in the amplitude spectrum with the appearance of ripples. In this study, a method is suggested to mitigate this phenomenon. To achieve this goal, inverse filtering was used to estimate the excitation and transfer functions of the vocal tract. Subsequently, using the derived parameterisation coefficients, statistical models for individual Polish phonemes were established as mixtures of Gaussian distributions. The impact of these corrections on the classification accuracy of Polish vowels was then investigated. The proposed modification of the parameterisation method fulfils the expectations, the scatter of feature vector values was reduced.","PeriodicalId":13922,"journal":{"name":"International Journal of Electronics and Telecommunications","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141803079","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Video compression and optimization technologies - review 视频压缩和优化技术 - 回顾
IF 0.5
International Journal of Electronics and Telecommunications Pub Date : 2024-07-25 DOI: 10.24425/ijet.2024.149603
Syed Uddin, M. Leszczuk, M. Grega
{"title":"Video compression and optimization technologies - review","authors":"Syed Uddin, M. Leszczuk, M. Grega","doi":"10.24425/ijet.2024.149603","DOIUrl":"https://doi.org/10.24425/ijet.2024.149603","url":null,"abstract":"The use of video streaming is constantly increasing. High-resolution video requires resources on both the sender and the receiver side. Many compression techniques can be utilized to compress the video and simultaneously maintain quality. The main goal of this paper is to provide an overview of video streaming and QoE. This paper describes the basic concepts and discusses existing methodologies to measure QoE. Subjective, objective, and video compression technologies are discussed. This review paper gathers the codec implementation developed by MPEG, Google, and Apple. This paper outlines the challenges and future research directions that should be considered in the measurement and assessment of the quality of experience for video services.","PeriodicalId":13922,"journal":{"name":"International Journal of Electronics and Telecommunications","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141804468","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Information technology in teaching and learning process at higher education institutions in students’ opinions 学生眼中高等院校教学过程中的信息技术
IF 0.5
International Journal of Electronics and Telecommunications Pub Date : 2024-07-25 DOI: 10.24425/ijet.2024.149607
M. W. Romaniuk, J. Łukasiewicz-Wieleba
{"title":"Information technology in teaching and learning process at higher education institutions in students’ opinions","authors":"M. W. Romaniuk, J. Łukasiewicz-Wieleba","doi":"10.24425/ijet.2024.149607","DOIUrl":"https://doi.org/10.24425/ijet.2024.149607","url":null,"abstract":"The article analyzes the opinions of students of The. Maria Grzegorzewska University on the use of information technologies in the teaching and learning process. In the diagnostic survey 139 students took part. The results indicate that students appreciate technologies for facilitating access to teaching materials, effectiveness of communication and opportunities for self-education, especially in the context of the pandemic, but they are not perceived as a remedy for all educational problems. The key challenges are providing appropriate infrastructure, teachers' competences, and students' self-regulation skills. Statistical analyzes have shown differences in the level of IT competences of students at various stages of studies, with a noticeable increase in these competences as they progress in education. The study emphasizes that technology should be a support in education, not a purpose in itself.","PeriodicalId":13922,"journal":{"name":"International Journal of Electronics and Telecommunications","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141805497","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Experimental validation of asymmetric PZT optimal shape in the active vibration reduction of triangular plates 非对称 PZT 最佳形状在三角形板主动减振中的实验验证
IF 0.5
International Journal of Electronics and Telecommunications Pub Date : 2024-07-25 DOI: 10.24425/ijet.2024.149579
Romuald Kuras, Sebastian Hajder
{"title":"Experimental validation of asymmetric PZT optimal shape in the active vibration reduction of triangular plates","authors":"Romuald Kuras, Sebastian Hajder","doi":"10.24425/ijet.2024.149579","DOIUrl":"https://doi.org/10.24425/ijet.2024.149579","url":null,"abstract":"In the active vibration reduction of two-dimensional structures, piezoelectric actuators of regular shapes, e.g. rectangular, circular, are commonly used. However, the shape of the transducers can be irregular, asymmetric (a-PZT), and its geometry can be an object for optimization. The paper presents an experimental validation of the application of optimal shaped a- PZT in the active reduction of triangular plate vibrations. Optimization was based on the criterion of the maximum bending moment. This means that the center of a-PZT is located at the point where the bending moment of the plate has reached its absolute maximum. The isosceles right triangular plate with simply supported edges was chosen as the research object. The research confirms the validity of the criterion used for optimization and may be an introduction to considering the use of optimal a-PZT in the active reduction of vibrations for more complex structures.","PeriodicalId":13922,"journal":{"name":"International Journal of Electronics and Telecommunications","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141802303","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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