• Title/Summary/Keyword: Key sound

Search Result 197, Processing Time 0.026 seconds

A cable tension identification technology using percussion sound

  • Wang, Guowei;Lu, Wensheng;Yuan, Cheng;Kong, Qingzhao
    • Smart Structures and Systems
    • /
    • v.29 no.3
    • /
    • pp.475-484
    • /
    • 2022
  • The loss of cable tension for civil infrastructure reduces structural bearing capacity and causes harmful deformation of structures. Currently, most of the structural health monitoring (SHM) approaches for cables rely on contact transducers. This paper proposes a cable tension identification technology using percussion sound, which provides a fast determination of steel cable tension without physical contact between cables and sensors. Notably, inspired by the concept of tensioning strings for piano tuning, this proposed technology predicts cable tension value by deep learning assisted classification of "percussion" sound from tapping a steel cable. To simulate the non-linear mapping of human ears to sound and to better quantify the minor changes in the high-frequency bands of the sound spectrum generated by percussions, Mel-frequency cepstral coefficients (MFCCs) were extracted as acoustic features to train the deep learning network. A convolutional neural network (CNN) with four convolutional layers and two global pooling layers was employed to identify the cable tension in a certain designed range. Moreover, theoretical and finite element methods (FEM) were conducted to prove the feasibility of the proposed technology. Finally, the identification performance of the proposed technology was experimentally investigated. Overall, results show that the proposed percussion-based technology has great potentials for estimating cable tension for in-situ structural safety assessment.

Separation of Voiced Sounds and Unvoiced Sounds for Corpus-based Korean Text-To-Speech (한국어 음성합성기의 성능 향상을 위한 합성 단위의 유무성음 분리)

  • Hong, Mun-Ki;Shin, Ji-Young;Kang, Sun-Mee
    • Speech Sciences
    • /
    • v.10 no.2
    • /
    • pp.7-25
    • /
    • 2003
  • Predicting the right prosodic elements is a key factor in improving the quality of synthesized speech. Prosodic elements include break, pitch, duration and loudness. Pitch, which is realized by Fundamental Frequency (F0), is the most important element relating to the quality of the synthesized speech. However, the previous method for predicting the F0 appears to reveal some problems. If voiced and unvoiced sounds are not correctly classified, it results in wrong prediction of pitch, wrong unit of triphone in synthesizing the voiced and unvoiced sounds, and the sound of click or vibration. This kind of feature is usual in the case of the transformation from the voiced sound to the unvoiced sound or from the unvoiced sound to the voiced sound. Such problem is not resolved by the method of grammar, and it much influences the synthesized sound. Therefore, to steadily acquire the correct value of pitch, in this paper we propose a new model for predicting and classifying the voiced and unvoiced sounds using the CART tool.

  • PDF

New Method for Measurement and Validation of In-situ Sound Transmission Loss (In-situ 소음투과손실 측정 및 검증을 위한 기법 개발)

  • Lee, Hwa-Soo;Park, Hong-Cheol;Yoon, Seong-Ho
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2008.04a
    • /
    • pp.795-800
    • /
    • 2008
  • The sound transmission loss is a key index to evaluate the acoustic performance of a car-body structure at the high frequency range. From this paper, a new validation method for in-situ sound transmission loss is proposed. First, in-situ sound transmission loss is measured by using PU intensity probe on the condition of complete vehicle. Second, validation test, which is consisted of internal, external and total frequency response function test, is performed by using volume acceleration source and microphones. Then, these test results are compared to validate the accuracy of in-situ sound transmission loss. Finally, the test result of in-site method is compared with results of two reverberant room test method and SEA analytical method. The reliability of in-situ method is confirmed by these procedures.

  • PDF

Design chart of sound insulation for multiple panels (다중판넬의 차음설계차트)

  • Kang, Hyun-Ju;Kim, Bong-Ki;Kim, Sang-Ryul
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2006.11a
    • /
    • pp.946-949
    • /
    • 2006
  • This study is a trial to make a design chart of sound insulation for multiple panel. Dilatational frequency, ${\Large f}_d$ becomes a key factor for optimal design since it acts like a turning point in sound insulation performance of such panels. Hence, in tuning the ${\Large f}_d$ optimally, elastic modulus of core material and thickness of the skin panel is designated to parameters. Based on these parameter, a design chart of sound insulation for multiple panel is made. Its applicability is proved by the case study of High noise reduction panel.

  • PDF

Absolute sound level algorithm for contents platform (콘텐츠 플랫폼 적용을 위한 절대음량 알고리즘)

  • Gyeon, Du-Heon
    • The Journal of the Acoustical Society of Korea
    • /
    • v.39 no.5
    • /
    • pp.424-434
    • /
    • 2020
  • This paper describes an algorithm that calculates Absolute Sound Level (ASL) for contents platform. ASL is a single volume representing individual sound sources and is a concept designed to integrate and utilize the sound level units in digital sound source and physical domain from a speaker in practical areas. For this concept to be used in content platforms and others, it is necessary to automatically derive the ASL without having to go through a hearing of mastering engineers. The key parameters of which a person recognizes the representative sound level of an individual single sound source are the areas of "frequency, maximum energy, energy variation coefficient, and perceived energy distribution," and the ASL was calculated through the normalizing of the weights.

Natural 3D Lip-Synch Animation Based on Korean Phonemic Data (한국어 음소를 이용한 자연스러운 3D 립싱크 애니메이션)

  • Jung, Il-Hong;Kim, Eun-Ji
    • Journal of Digital Contents Society
    • /
    • v.9 no.2
    • /
    • pp.331-339
    • /
    • 2008
  • This paper presents the development of certain highly efficient and accurate system for producing animation key data for 3D lip-synch animation. The system developed herein extracts korean phonemes from sound and text data automatically and then computes animation key data using the segmented phonemes. This animation key data is used for 3D lip-synch animation system developed herein as well as commercial 3D facial animation system. The conventional 3D lip-synch animation system segments the sound data into the phonemes based on English phonemic system and produces the lip-synch animation key data using the segmented phoneme. A drawback to this method is that it produces the unnatural animation for Korean contents. Another problem is that this method needs the manual supplementary work. In this paper, we propose the 3D lip-synch animation system that can segment the sound and text data into the phonemes automatically based on Korean phonemic system and produce the natural lip-synch animation using the segmented phonemes.

  • PDF

Analysis on the Therapeutic Music of Chinese Five-sounds (오음 표준화를 위한 중국 '오음' 치료음악의 분석)

  • Ha Ki Jong;Lee Yong Tae;Kim Gyeong Cheol
    • Journal of Physiology & Pathology in Korean Medicine
    • /
    • v.16 no.6
    • /
    • pp.1106-1109
    • /
    • 2002
  • The analysis on the therapic music of chinese five-sounds studied in order to the stand ardization of the five-sounds. The results were as follows; The central sound of Gung(宮) becomes Do. This music goes on slow speed from first to last and appears the bright, quiet and stable mood. The central sound of Sang(商) becomes Re. This music mainly uses the brass and the fist appears the heavy feeling but gradually becomes ascending mood. The central sound of Kang(角) becomes Mi. This music mainly uses the wood-wind imstrument and appears the most light and vivid feeling. The central sound of Chi(徵) becomes Sol. All instruments sound grandly in the first part, and subsequently sound gentle. The central sound of Woo(羽) becomes La. This music appears dark and tragic mood that is generally used in the minor key. It is played slowly on the whole and appears lyrical feeling in the process of controlling and quiet. In the future, the study on diagnosis and therapy through the standardization of the five-sounds will be continued.

Improvements of Reverberation Chamber's Performance by using Active Noise Control (능동 소음제어를 이용한 잔향실의 저주파 특성 개선 가능성)

  • K. Kim, Young-Key;Oh, Shi-Whan;Moon, Sang-Mu;Im, Jong-Min;Kim, Hong-Bae
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2004.11a
    • /
    • pp.857-861
    • /
    • 2004
  • An active method that improves low frequency characteristics of a reverberation chamber has been proposed. Spatial uniformity of sound pressure at low frequency has been increased by applying active noise control system. The system acts as frequency selective damping materials, which decreases resonance at low frequency and leave high frequency sound field as it is. Linearity of the chamber, which is essential for sound power measurement in the chamber, is guaranteed since fixed control logic has been adopted. Simple application and tests have been done in a small sized rectangular reverberation chamber which has 400Hz cutoff, Loud speakers were used to simulate a noise source and to construct an active noise control system. The spatial distribution of a sound field at 250Hz, 315Hz and 400Hz bands has been measured before and after control. The standard deviation of sound field has been decreased from 3.4dB to 2.5dB. The results show the possibility of active control system as a sound diffuser.

  • PDF

Identification of Printer Noise Source and Its Sound Quality Evaluation System Development (프린터 부품 소음원에 따른 감성소음 평가시스템의 개발)

  • Park, Sang-Won;Yang, Hong-Jun;Na, Eun-Woo;Lee, Sang-Kwon;Park, Yeong-Jae;Kim, Jong-Woo
    • Transactions of the Korean Society for Noise and Vibration Engineering
    • /
    • v.20 no.11
    • /
    • pp.1018-1024
    • /
    • 2010
  • The printer noise consists of the noise of the various components and parts such as motor, fan and solenoid. And the human's printing sound recognition shows various aspects when the printer starts to print papers because the components operate at the same time. Especially, printers are usually installed in the quiet office room. Therefore the printing noise is related to its competitiveness in the market. The importance of the printer sound qualities is increasing and it is necessary to develop the sound quality evaluation system, so it is a key point to identify the noise source of the printer and develop the sound quality index to each component. By using this evaluation system, it is possible to evaluate the sound quality of a prototype printer compared to the already existing one. In this paper, the printer sound quality evaluation system was developed by the following steps. Firstly, the signal processing method was applied to the recorded printing sound to identity and split the noise of components. Secondly, the MLR(multiple linear regression) method and the psychoacoustics were used to develop the sound quality index. Finally, the improvement of the printer sound quality is possible by using the result of the MLR and the path analysis. The output of this research will be applied to the development of a new printer.

Research on the Effects of Boundary Element Characteristics on Reconstruction Accuracy by BEM-based NAH

  • Zhang, Hai-Bin;Kim, Yang-Hann;Jiang, Wei-Kang
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2012.10a
    • /
    • pp.630-635
    • /
    • 2012
  • Nearfield acoustic holography method predicts an unmeasured sound field, therefore it depends on its prediction methods. In particular, if one has radiators or scatters, which cannot be expressed by simple geometry, then inverse boundary element method (BEM) is normally employed to reconstruct the sound field induced by sound sources with irregular profiles. The characteristics of boundary element, including the element shape, characteristic length, order of shape function and others, affect the reconstruction error. Investigating the errors by means of changing these factors will provide a guide line for selecting appropriate factors, associated with the elements of BEM. These factors are investigated by numerical simulations, and the accuracies with respect to the variant factors are compared. Novel suggestions for selecting appropriate boundary element factors are described based on the simulation results.

  • PDF