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Journal of the Acoustical Society of Korea最新文献

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Design of piezoelectric micro-machined ultrasonic transducer for wideband ultasonic radiation in air 用于空气中宽带超声辐射的压电微机械超声换能器设计
IF 0.4
Journal of the Acoustical Society of Korea Pub Date : 2020-01-01 DOI: 10.7776/ASK.2020.39.2.087
Hongmin Ahn, Jaehyeok Jin, W. Moon
{"title":"Design of piezoelectric micro-machined ultrasonic transducer for wideband ultasonic radiation in air","authors":"Hongmin Ahn, Jaehyeok Jin, W. Moon","doi":"10.7776/ASK.2020.39.2.087","DOIUrl":"https://doi.org/10.7776/ASK.2020.39.2.087","url":null,"abstract":"In this paper, the design of piezoelectric Micro-machined Ultrasonic Transducer (pMUT) for wideband ultrasonic radiation in air was investigated. One of the methods to achieve wide frequency bandwidth in single device is modeling the transducer to multi-resonance system. The new pMUT was designed as a multi-resonance system with the addition of a suitable acoustic structure to the front and back of a thin film structure. A new pMUT consisting of thin film parts, radiation parts, and packaging parts is designed with a Lumped Parameter Model (L.P.M). Finally, it was validated as a Finite Element Method (FEM) simulation. The final designed pMUT achieved a frequency band of 102 kHz ~ 132 kHz (-3 dB).","PeriodicalId":42689,"journal":{"name":"Journal of the Acoustical Society of Korea","volume":"39 1","pages":"87-97"},"PeriodicalIF":0.4,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71370664","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
L 1 norm-recursive least squares algorithm for the robust sparse acoustic communication channel estimation 鲁棒稀疏声通信信道估计的l1范数递归最小二乘算法
IF 0.4
Journal of the Acoustical Society of Korea Pub Date : 2020-01-01 DOI: 10.7776/ASK.2020.39.1.032
Jun-Seok Lim, Yonggook Pyeon, Sungil Kim
{"title":"L 1 norm-recursive least squares algorithm for the robust sparse acoustic communication channel estimation","authors":"Jun-Seok Lim, Yonggook Pyeon, Sungil Kim","doi":"10.7776/ASK.2020.39.1.032","DOIUrl":"https://doi.org/10.7776/ASK.2020.39.1.032","url":null,"abstract":"","PeriodicalId":42689,"journal":{"name":"Journal of the Acoustical Society of Korea","volume":"39 1","pages":"32-37"},"PeriodicalIF":0.4,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71370546","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 study on the broadband beam pattern synthesis using spatial response variation 基于空间响应变化的宽带波束方向图合成研究
IF 0.4
Journal of the Acoustical Society of Korea Pub Date : 2020-01-01 DOI: 10.7776/ASK.2020.39.3.200
Jun-Seok Lim, Keunhwa Lee, J. Ahn
{"title":"A study on the broadband beam pattern synthesis using spatial response variation","authors":"Jun-Seok Lim, Keunhwa Lee, J. Ahn","doi":"10.7776/ASK.2020.39.3.200","DOIUrl":"https://doi.org/10.7776/ASK.2020.39.3.200","url":null,"abstract":"In this paper, we propose a broadband beamforming method using the Spatial Response Variation (SRV) which is defined to measure the fluctuation of the array spatial response within the desired frequency band. By applying the SRV to regularization term, we achieve a good quality main beam width variation less than 1 degree within the desired frequency band. In design experiments, we show that the proposed method is better than the existing method.","PeriodicalId":42689,"journal":{"name":"Journal of the Acoustical Society of Korea","volume":"39 1","pages":"200-206"},"PeriodicalIF":0.4,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71370691","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
Acoustic parabolic equation model with a directional source 有方向性声源的声波抛物方程模型
IF 0.4
Journal of the Acoustical Society of Korea Pub Date : 2020-01-01 DOI: 10.7776/ASK.2020.39.1.001
Keunhwa Lee
{"title":"Acoustic parabolic equation model with a directional source","authors":"Keunhwa Lee","doi":"10.7776/ASK.2020.39.1.001","DOIUrl":"https://doi.org/10.7776/ASK.2020.39.1.001","url":null,"abstract":": The acoustic parabolic equation method in the ocean is an efficient technique to calculate the acoustic field in the range-dependent environment, emanating from a point source. However, we often need to use the directional source with a main beam in the practical problem. In this paper, we present two methods to implement the directional source in the acoustic parabolic equation code easily. One is simply to filter the Delta function idealized as an omni-directional point source. Another method is based on the rational filtering of the self-starter solution. It has a limitation not to separate the up-going and the down-going wave for the depth, but would be useful in implementing the mode propagation. Numerical examples for validation are given in the Pekeris environment and the deep sea environment","PeriodicalId":42689,"journal":{"name":"Journal of the Acoustical Society of Korea","volume":"39 1","pages":"1-7"},"PeriodicalIF":0.4,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71370499","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
Signal synchronization method for depth information transmission of high-speed underwater vehicle 高速水下航行器深度信息传输的信号同步方法
IF 0.4
Journal of the Acoustical Society of Korea Pub Date : 2020-01-01 DOI: 10.7776/ASK.2020.39.2.069
Joohyeong Lee, Guen‑Hyeok Lee, An Jeongha, Ki-Man Kim, M. Han, S. Kim
{"title":"Signal synchronization method for depth information transmission of high-speed underwater vehicle","authors":"Joohyeong Lee, Guen‑Hyeok Lee, An Jeongha, Ki-Man Kim, M. Han, S. Kim","doi":"10.7776/ASK.2020.39.2.069","DOIUrl":"https://doi.org/10.7776/ASK.2020.39.2.069","url":null,"abstract":"This paper deals with a method of transmitting depth information of a high-speed underwater vehicle. The depth information signal transmitted from the high-speed mobile object is received with high frequency variability. In the proposed method, we apply not only frequency synchronization but also additional synchronization on the time axis like the existing method. In the case of a Doppler frequency bank with less resolution than the conventional method through simulations performed in the environment moving up to 50 kn, and the depth information is recovered using the proposed method, the error rate of 6 % ~ 9 % is reduced to 0.2 % ~ 1 %.","PeriodicalId":42689,"journal":{"name":"Journal of the Acoustical Society of Korea","volume":"39 1","pages":"69-76"},"PeriodicalIF":0.4,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71370567","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
Underdetermined blind source separation using normalized spatial covariance matrix and multichannel nonnegative matrix factorization 利用归一化空间协方差矩阵和多通道非负矩阵分解进行欠定盲源分离
IF 0.4
Journal of the Acoustical Society of Korea Pub Date : 2020-01-01 DOI: 10.7776/ASK.2020.39.2.120
Son‑Mook Oh, Jung Han Kim
{"title":"Underdetermined blind source separation using normalized spatial covariance matrix and multichannel nonnegative matrix factorization","authors":"Son‑Mook Oh, Jung Han Kim","doi":"10.7776/ASK.2020.39.2.120","DOIUrl":"https://doi.org/10.7776/ASK.2020.39.2.120","url":null,"abstract":"This paper solves the problem in underdetermined convolutive mixture by improving the disadvantages of the multichannel nonnegative matrix factorization technique widely used in blind source separation. In conventional researches based on Spatial Covariance Matrix (SCM), each element composed of values such as power gain of single channel and correlation tends to degrade the quality of the separated sources due to high variance. In this paper, level and frequency normalization is performed to effectively cluster the estimated sources. Therefore, we propose a novel SCM and an effective distance function for cluster pairs. In this paper, the proposed SCM is used for the initialization of the spatial model and used for hierarchical agglomerative clustering in the bottom-up approach. The proposed algorithm was experimented using the ‘Signal Separation Evaluation Campaign 2008 development dataset’. As a result, the improvement in most of the performance indicators was confirmed by utilizing the ‘Blind Source Separation Eval toolbox’, an objective source separation quality verification tool, and especially the performance superiority of the typical SDR of 1 dB to 3.5 dB was verified.","PeriodicalId":42689,"journal":{"name":"Journal of the Acoustical Society of Korea","volume":"39 1","pages":"120-130"},"PeriodicalIF":0.4,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71370683","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
Discrete-time approximation and modeling of a broadband underwater propagation channel based on eigenray analysis 基于本征射线分析的宽带水下传播信道离散时间逼近与建模
IF 0.4
Journal of the Acoustical Society of Korea Pub Date : 2020-01-01 DOI: 10.7776/ASK.2020.39.3.216
Donghoon Shin, Hyeon‑Deok Cho, Taek-ik Kwon, J. Ahn
{"title":"Discrete-time approximation and modeling of a broadband underwater propagation channel based on eigenray analysis","authors":"Donghoon Shin, Hyeon‑Deok Cho, Taek-ik Kwon, J. Ahn","doi":"10.7776/ASK.2020.39.3.216","DOIUrl":"https://doi.org/10.7776/ASK.2020.39.3.216","url":null,"abstract":"In this paper, broadband underwater propagation channel modeling based on eigenray analysis is discussed. Underwater channels are often formulated in frequency domain time-harmonic signals, which are impractical for simulating broadband signals in time domain. In this regard, time domain modeling of the underwater propagation channel is required for the simulation of broadband signals, for which the eigenray analysis based on ray tracing, resulting in multipath propagation delays in time-domain, is used in this paper. For discrete time system application, the phase, frequency-dependent loss and non-integer sample delays for each eigenray, are approximated by the finite impulse response of the broadband propagation channel.","PeriodicalId":42689,"journal":{"name":"Journal of the Acoustical Society of Korea","volume":"39 1","pages":"216-225"},"PeriodicalIF":0.4,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71370696","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
Noise distribution analysis and noise barrier measures of thermal power plant 火电厂噪声分布分析及隔声措施
IF 0.4
Journal of the Acoustical Society of Korea Pub Date : 2020-01-01 DOI: 10.7776/ASK.2020.39.2.105
J. Yun, Won-Jin Kim
{"title":"Noise distribution analysis and noise barrier measures of thermal power plant","authors":"J. Yun, Won-Jin Kim","doi":"10.7776/ASK.2020.39.2.105","DOIUrl":"https://doi.org/10.7776/ASK.2020.39.2.105","url":null,"abstract":": An analysis model of noise map is proposed to evaluate and reduce the acoustical noise of power plant and its surroundings. The sound powers of many noise sources are estimated by measuring the sound levels of major equipments in the power plant. The analysis of noise has been made by using ENPro that is a commercial program for environmental noise prediction. The proposed model is verified by comparing the results from noise analysis and measurement at several points of the power plant units 1 through 4, and residential areas. It is shown that noise map simulation using the proposed model has a reliability, since the overall noise level approximates within the error of ±2 dB. Furthermore, through noise analysis, the increasing effect of noise due to newly established units 5 and 6 on residential areas is also analyzed. Consequently, the noise barrier is designed to meet an environmental noise standard and satisfy low cost and safety conditions.","PeriodicalId":42689,"journal":{"name":"Journal of the Acoustical Society of Korea","volume":"39 1","pages":"105-112"},"PeriodicalIF":0.4,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71370673","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
Comparison of environmental sound classification performance of convolutional neural networks according to audio preprocessing methods 基于音频预处理方法的卷积神经网络环境声音分类性能比较
IF 0.4
Journal of the Acoustical Society of Korea Pub Date : 2020-01-01 DOI: 10.7776/ASK.2020.39.3.143
W. Oh
{"title":"Comparison of environmental sound classification performance of convolutional neural networks according to audio preprocessing methods","authors":"W. Oh","doi":"10.7776/ASK.2020.39.3.143","DOIUrl":"https://doi.org/10.7776/ASK.2020.39.3.143","url":null,"abstract":": This paper presents the effect of the feature extraction methods used in the audio preprocessing on the classification performance of the Convolutional Neural Networks (CNN). We extract mel spectrogram, log mel spectrogram, Mel Frequency Cepstral Coefficient (MFCC)","PeriodicalId":42689,"journal":{"name":"Journal of the Acoustical Society of Korea","volume":"39 1","pages":"143-149"},"PeriodicalIF":0.4,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71370687","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: 3
Applying feature normalization based on pole filtering to short-utterance speech recognition using deep neural network 基于极点滤波的特征归一化在深度神经网络短话语语音识别中的应用
IF 0.4
Journal of the Acoustical Society of Korea Pub Date : 2020-01-01 DOI: 10.7776/ASK.2020.39.1.064
J. Han, M. Kim, H. S. Kim
{"title":"Applying feature normalization based on pole filtering to short-utterance speech recognition using deep neural network","authors":"J. Han, M. Kim, H. S. Kim","doi":"10.7776/ASK.2020.39.1.064","DOIUrl":"https://doi.org/10.7776/ASK.2020.39.1.064","url":null,"abstract":"In a conventional speech recognition system using Gaussian Mixture Model-Hidden Markov Model (GMM-HMM), the cepstral feature normalization method based on pole filtering was effective in improving the performance of recognition of short utterances in noisy environments. In this paper, the usefulness of this method for the state-of-the-art speech recognition system using Deep Neural Network (DNN) is examined. Experimental results on AURORA 2 DB show that the cepstral mean and variance normalization based on pole filtering improves the recognition performance of very short utterances compared to that without pole filtering, especially when there is a large mismatch between the training and test conditions.","PeriodicalId":42689,"journal":{"name":"Journal of the Acoustical Society of Korea","volume":"39 1","pages":"64-68"},"PeriodicalIF":0.4,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71370562","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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