• Title/Summary/Keyword: Sound map

Search Result 99, Processing Time 0.027 seconds

Noise Map Modeling and Analysis of Thermal Power Plant (화력발전소의 소음지도 모델링 및 해석)

  • Kim, Won-Jin;Yun, Jun-Ho
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2013.10a
    • /
    • pp.605-610
    • /
    • 2013
  • This study proposes an analysis model to simulate a noise map and estimate noise distribution for a location and its surroundings of a power plant. The noise map analysis was executed by using ENPro that is a commercial program for environmental noise prediction. Experimental evaluation for the proposed analysis model was carried out by comparing the results from noise analysis and measurement at several major points of the power plant and residential areas.

  • PDF

BSR (Buzz, Squeak, Rattle) noise classification based on convolutional neural network with short-time Fourier transform noise-map (Short-time Fourier transform 소음맵을 이용한 컨볼루션 기반 BSR (Buzz, Squeak, Rattle) 소음 분류)

  • Bu, Seok-Jun;Moon, Se-Min;Cho, Sung-Bae
    • The Journal of the Acoustical Society of Korea
    • /
    • v.37 no.4
    • /
    • pp.256-261
    • /
    • 2018
  • There are three types of noise generated inside the vehicle: BSR (Buzz, Squeak, Rattle). In this paper, we propose a classifier that automatically classifies automotive BSR noise by using features extracted from deep convolutional neural networks. In the preprocessing process, the features of above three noises are represented as noise-map using STFT (Short-time Fourier Transform) algorithm. In order to cope with the problem that the position of the actual noise is unknown in the part of the generated noise map, the noise map is divided using the sliding window method. In this paper, internal parameter of the deep convolutional neural networks is visualized using the t-SNE (t-Stochastic Neighbor Embedding) algorithm, and the misclassified data is analyzed in a qualitative way. In order to analyze the classified data, the similarity of the noise type was quantified by SSIM (Structural Similarity Index) value, and it was found that the retractor tremble sound is most similar to the normal travel sound. The classifier of the proposed method compared with other classifiers of machine learning method recorded the highest classification accuracy (99.15 %).

Study on 3D Sound Source Visualization Using Frequency Domain Beamforming Method (주파수영역 빔형성 기법을 이용한 3차원 소음원 가시화)

  • Hwang, Eun-Sue;Lee, Jae-Hyung;Rhee, Wook;Choi, Jong-Soo
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2009.04a
    • /
    • pp.490-495
    • /
    • 2009
  • An approach to 3D visualization of multiple sound sources has been developed with the application of a moving array technique. Frequency-domain beamforming algorithm is used to generate a beam power map and the sound source is modeled as a point source. When a conventional delay and sum beamformer is used, it is considered that 2D distribution of sensors leads to have deficiency in spatial resolution along a measurement distance. The goal of moving an array in this study is to form 3D array aperture surrounding multiple sound sources so that the improved spatial resolution in a virtual space can be expected. Numerical simulation was made to examine source localization capabilities of various shapes of array. The 3D beam power maps of hemispherical and spherical distribution are found to have very sharp resolution. For experiments, two sound sources were placed in the middle of defined virtual space and arc-shaped line array was rotated around the sources. It is observed that spherical array show the most accurate determination of multiple sources' positions.

  • PDF

Study on 3D Sound Source Visualization Using Frequency Domain Beamforming Method (주파수영역 빔형성 기법을 이용한 3차원 소음원 가시화)

  • Hwang, Eun-Sue;Lee, Jae-Hyung;Rhee, Wook;Choi, Jong-Soo
    • Transactions of the Korean Society for Noise and Vibration Engineering
    • /
    • v.19 no.9
    • /
    • pp.907-914
    • /
    • 2009
  • An approach to 3D visualization of multiple sound sources has been developed with the application of a moving array technique. Frequency domain beamforming algorithm is used to generate a beam power map and the sound source is modeled as a point source. When a conventional delay and sum beamformer is used, it is considered that 2D distribution of sensors leads to have deficiency in spatial resolution along a measurement distance. The goal of moving an array in this study is to form 3D array aperture surrounding multiple sound sources so that the improved spatial resolution in a virtual space can be expected. Numerical simulation was made to examine source localization capabilities of various shapes of array. The 3D beam power maps of hemispherical and spherical distribution are found to have very sharp resolution. For experiments, several sound sources were placed in the middle of defined virtual space and arc-shaped line array was rotated around the sources. It is observed that spherical array shows the most accurate determination of multiple sources' positions.

Development of a Noise Map in Neighboring Areas Around Korean Train Express Line and Analysis of the Related High Speed Railway Noise Influence (한국형 고속철도 노선 주변 지역의 소음 지도 작성과 소음 영향 분석)

  • Lee, Jin-Young;Kil, Hyun-Gwon;Lee, Chan;Kim, Jin-Tae
    • Journal of Environmental Impact Assessment
    • /
    • v.20 no.4
    • /
    • pp.443-453
    • /
    • 2011
  • The purpose of present study is to develop a noise map around Korean Train Express (KTX) line. It is also to evaluate the high speed railway noise influence in neighboring areas around KTX. In order to develop the noise map, noise source modeling and 3-D noise radiation simulation have been performed by means of SoundPLAN program. The result of the noise map has been verified in comparison with the measured noise level. Noise measurements have been performed at 15 locations around KTX line. At each locations, 6 microphones were located 1.5m and 3m above the ground at each of 25m, 50m and 75 m distances from a center of the KTX track. The noise map showed clearly the high speed railway noise influence in neighboring areas around KTX line. The present study has also showed the noise could be reduced by using noise barriers constructed at severely noise-exposed locations.

Development of Evaluation Techniques on Marine Casualties by Ship's Signal Sound Interferences(l) - 3D Sound Field Control Model - (선박신호음 간섭에 따른 해양사고 영향평가기법 개발(1) - 3차원 음장제어 모델 -)

  • Yim Jeong Bin;Jung Jung Sik;Park Seong Hyeon;Kim Chang Kyeong;Sim Yeong Ho;Lee Ku Dong;Choi Ki Yeong
    • Proceedings of KOSOMES biannual meeting
    • /
    • 2003.11a
    • /
    • pp.45-51
    • /
    • 2003
  • The ship's signal sound dispersed by air, obstacles, and noises due to absorption, reflection, and disturbances, respectively. It is one of the factors of marine casualties by misjudgment if receiving direction The last target of this study is to prevent inherent marine casualty using the analysis-evaluation techniques if the interferences of ship's signal sound. In this work, three-dimensional sound field control model is proposed to simulate various sound transmitting characteristics according to sea environments at sea The efficiency test of the model was carried out using VR-based ship simulator.

  • PDF

NOISE SOURCE IDENTIFICATION WITH INCREASED SPATIAL RESOLUTION

  • Gade, Svend;Hald, Jorgen;Ginn, Bernard
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2012.10a
    • /
    • pp.636-642
    • /
    • 2012
  • Delay-and-sum (DAS) Planar Beamforming has been a widely used Noise Source Identification Technique for the last decade. It is a quick one shot measurement technique being able to map sources that are larger than the array itself. The spatial resolution is proportional to distance between array and source, and inversely proportional to wavelength, thus the resolution is only good at medium to high frequencies. Improved algorithms using iterative de-convolution techniques offers up to ten times better resolution. The principle behind these techniques is described in this paper, as well as measurement examples from the automotive industry are presented.

  • PDF

Preliminary Design and Implementation of 3D Sound Play Interface for Graphic Contents Developer (그래픽 콘텐츠 개발자를 위한 입체음 재생 인터페이스 기본 설계 및 구현)

  • Won, Yong-Tae;Jang, Bong-Seog;Ahn, Dong-Soon;Kwak, Hoon-Sung
    • Journal of Digital Contents Society
    • /
    • v.9 no.2
    • /
    • pp.203-211
    • /
    • 2008
  • Due to the advance of H/W and S/W techniques to play 3D sound, the virtual space contented by 3D graphics and sounds can provide users more improved realities and vividness. However for the small 3D contents developers and companies, it is hard to implement 3D sound techniques because the implementation requires expensive sound engines, 3D sound technical understanding and 3D sound programming skills. Therefore 3D-sound-playing-interface is necessary to easy and cost-effective 3D sound implementation. Using this interface, graphics experts can easily add 3D sound techniques to their applications. In this paper, the followings are designed and implemented as a preliminary stage in the way of developing the 3D sound playing interface. First, we develop 3D sound S/W modules converting mono to 3D sound in PC based systems. Second, we develop the interconnection modules to map 3D graphic objects and sound sources. The developed modules in this paper can allow the user to percept sound source position and surround effect at the moving positions in the virtual world. In the coming works, we are going to develop the more completed 3D sound playing interface consisted of the synchronization technique for sound and moving objects, and HRTF.

  • PDF