• Title, Summary, Keyword: Sound characteristics

Search Result 1,795, Processing Time 0.053 seconds

Cross-Cultural Comparison of Sound Sensation and Its Prediction Models for Korean Traditional Silk Fabrics

  • Yi, Eun-Jou
    • Fibers and Polymers
    • /
    • v.6 no.3
    • /
    • pp.269-276
    • /
    • 2005
  • In this study, cross-cultural comparison of sound sensation for Korean traditional silk fabrics between Korea and America was performed and prediction models for sound sensation by objective measurements including sound parameters such as level pressure of total sound (LPT), Zwicker's psychoacoustic characteristics, and mechanical properties by Kawabata Evaluation System were established for each nation to explore the objective parameters explaining sound sensation of the Korean traditional silk. As results, Koreans felt the silk fabric sounds soft and smooth while Americans were revealed as perceiving them hard and rough. Both Koreans and Americans were pleasant with sounds of Gongdan and Newttong and especially Newttong was preferred more by Americans in terms of sound sensation. In prediction models, some of subjective sensation were found as being related mainly with mechanical properties of traditional silk fabrics such as surface and compressional characteristics.

A Study on the Reduction Characteristics of Floor Impact Sound Insulation Due to the Ceiling Frame Structures in Apartment Houses (공동주택의 천장틀구조 변화에 따른 바닥충격음 차음특성 연구)

  • 정환욱;기노갑;송민정;김선우
    • Transactions of the Korean Society for Noise and Vibration Engineering
    • /
    • v.12 no.8
    • /
    • pp.573-580
    • /
    • 2002
  • Generally the ceiling frame of apartment house is made of wood. But the wood frame has several problems due to the natural properties such as distortion by shrink, low fire resistance and material loss in the construction field. And it has some defections in sound insulation performance. Therefore it is necessary to develop a new method that can be used as a ceiling frame. This study aims to analyze and to compare the sound insulation characteristics against the floor impact sound between wood ceiling frame and M-bar frame which is made of steel. The results of this study are like these. M-bar frame is more effective than wood ceiling frame in sound insulation. And sound absorbing or sound insulation materials which can be Put on gypsum board are helpful to improve floor impact sound insulation performance.

The Selection of the Scenery and Sound as the Environmental Friendly Elements (친환경 요소로서의 경관과 그에 어울리는 소리의 선택)

  • Kim, Hang;Jeon, Ji-Hyeon;Jang, Gil-Soo;Kook, Chan;Shin, Yong-Gyu
    • Transactions of the Korean Society for Noise and Vibration Engineering
    • /
    • v.16 no.4
    • /
    • pp.414-419
    • /
    • 2006
  • In this research, the test how the evaluation of the spacial image influenced by the environmental friendly elements included in the visual information, and how the selection of the sound changed depending on the characteristics of spacial image were carried out by the 40 subjects. Vast tracts of green land and the waterfront were highly preferred and impressive than the other spaces. The green music, signal with water sound and bird chirping sound were highly scored. In the frequency characteristics of the factors, the first factor was artificial sound (high at the low frequency band), the second was natural sound(uniform at all frequency band) and the third was water sound (high at the middle and high frequency band over 500 Hz) . This shows that the proposal of the sound which has the frequency characteristics fit to the spacial image should be selected for the soundscape of the target space.

Sound Absorbing Characteristics According to Interior Configuration of Noise Barrier (흡음형 방음벽의 내부 구성에 따른 흡음특성)

  • 박진규;김상헌;김관주;박희준
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • /
    • pp.387-392
    • /
    • 2003
  • This study is put a focus on the identification of sound characteristics according to the interior configuration of sound absorption material and air gap. Noise barrier is general consists of front perforated panel, air layer, sound absorption material, air gap and back plate. Noise barrier is required to the NRC value of 0.7. The absorbing performance of the noise barrier relies on the opening ratio of the perforated panel and the efficiency of the absorbing material. This study has observed the effect of opening ratio and hole size, the increase of sound absorbing performance by the configurations of sound absorption material and air gap. New designed noise barrier is achieved the acoustical performance of 0.87 the measurement in a reveration room.

  • PDF

Study on the Sound Radiaton Characteristics of Trains by Sound Intensity Method (음향 인텐시티법을 이용한 주행열차의 음향방사특성의 검토)

  • 주진수;김재철
    • Journal of KSNVE
    • /
    • v.8 no.4
    • /
    • pp.603-608
    • /
    • 1998
  • In order to obtain basic data for the prediction of railway noise propagation, the noise radiation characteristics (source position, radiation directivity, etc) of trains were measured by using the sound intensity method. The measurements were performed at a side of railway by setting an intensity-probe array. As the measurement results, it was found that rolling noise due to interaction between wheel and rail and motor noise radiation from the lower part of train are dominant. The location of main sound sources can be described as being at the height of 0.1m in the center line of track, and the radiation directivity in the cross section of actually running trains are presented as a dipole source.

  • PDF

Characteristics of Rustling Sound of Laminated Fabric Utilizing Nano-web (나노웹을 이용한 라미네이트소재의 마찰음 특성)

  • Jeong, Tae-Young;Lee, Eu-Gene;Lee, Seung-Sin;Cho, Gil-Soo
    • Fashion & Textile Research Journal
    • /
    • v.15 no.4
    • /
    • pp.620-629
    • /
    • 2013
  • This study examines the rustling sound characteristics of electrospun nanofiber web laminates according to layer structures. This study assesses mechanical properties and frictional sounds (such as SPL); in addition, Zwicker's psychoacoustic parameters (such as Loudness (Z), Sharpness (Z), Roughness (Z), and Fluctuation strength (Z)) were calculated using the Sound Quality Program (ver.3.2, B&K, Denmark). The result determined how to control these characteristics and minimize rustling sounds. A total of 3 specimens' frictional sound (generated at 0.63 m/s) was recorded using a Simulator for Frictional Sound of Fabrics (Korea Patent No. 10-2008-0105524) and SPLs were analyzed with a Fast Fourier Transformation (FFT). The mechanical properties of fabrics were measured with a KES-FB system. The SPL value of the sound spectrum showed 6.84~58.47dB at 0~17,500Hz. The SPL value was 61.2dB for the 2-layer PU nanofiber web laminates layered on densely woven PET(C1) and was the highest at 65.1dB for the 3-layer PU nanofiber web laminates (C3). Based on SPSS 18.0, it was shown that there is a correlation between mechanical properties and psychoacoustic characteristics. Tensile properties (LT), weight (T), and bending properties (2HB) showed a high correlation with psychoacoustic characteristics. Tensile linearity (LT) with Loudness (Z) showed a negative correlation coefficient; however, weight (T) with Sharpness (Z) and Roughness (Z), and bending hysteresis (2HB) with Roughness (Z) indicated positive correlation coefficients, respectively.

Phase Characteristics of Approximated Head-related Transfer Functions(HRTFS) Using IIR Filters on the Sound Localization

  • Kanazawa, Kenichi;Hasegawa, Hiroshi;Kasuga, Masao;Matsumoto, Shuichi;Koike, Atsushi;Yamamoto, Hideo
    • Proceedings of the IEEK Conference
    • /
    • /
    • pp.237-240
    • /
    • 2000
  • We have proposed a simple method based on IIR filters for realizing sound image localization. How-ever the nonlinearity of phase characteristics of the IIR filters, which are used for sound image localization, cause decrease of the localization accuracy. In this paper we investigate the influence of phase characteristics on the sound localization. Head-related transfer functions (HRTFs) of a dummy-head are approximated by the IIR filter. We carried out sound image localization experiment with 2-loudspeaker reproduction using the approximated HRTFs. Then the errors which obtained from experiments were compared with the theoretical values which were estimated from the phase shifts of the IIR filters. As a result there was little influence of the nonlinear phase characteristics of the IIR fitters in the localization on the horizontal plane.

  • PDF

Modeling of the Head-Related Transfer Functions with Optimum Reflection Wave Transfer Characteristics in Free-Field Listening over Headphones (헤드폰을 이용한 자유 음장 청취에서의 최적 반사 음파 전달 특성을 갖는 머리 전달 함수 모델링)

  • Yim, Jeong-Bin;Kim, Chun-Duck;Kang, Seong-Hoon
    • The Journal of the Acoustical Society of Korea
    • /
    • v.16 no.2
    • /
    • pp.16-25
    • /
    • 1997
  • A new method to model the HRTF's(Head-Related Transfer Function), which could give improvement of the sound localization accuracy using the spatial effects by the reflected sound wave transfer characteristics, is proposed. When using the HRTF model having reflected sound wave transfer characteristics, the accuracy of sound localization was quite improved up to about 23%, compared with using the direct wave transfer characteristics only. Furthermore, it is verified that the spatial impression could be a factor to enhance the ability of sound localization.

  • PDF

Characteristics of Sound Response in Ear Canal of Human and Reproduction of Acoustical Space (인간 이도의 소리응답특성과 음향공간의 재현)

  • Ahn, Tae-Soo;Lee, Doo-Ho
    • Transactions of the Korean Society for Noise and Vibration Engineering
    • /
    • v.21 no.9
    • /
    • pp.842-849
    • /
    • 2011
  • The human ear canal amplifies the sound pressure level at specific frequency bands. The characteristics of the ear canal are very similar to those of curved cylindrical tube. In this study, the characteristics of sound transfer in human ear canal were measured and the acoustical space of ear canal was reproduced from the canal cavity geometry. For the measurement of sound transfer function in ear canal, a probe microphone and a reference microphone were used. The sound transfer functions were measured for 5 human subjects. To reproduce the acoustical space of the ear canal, two kinds of ear simulator were designed. The first one is a straight cylindrical tube type and the other is a real-shape ear of which geometry was taken from a micro-CT scanning of a human ear. The characteristics of the reproduced apparatus were compared with those of the human and a commercial ear simulator, RA0045 of G.R.A.S. Inc. The comparison results show that the developed apparatus well represent the ear canal characteristics in the low frequency, but have limited coincidence in level over high frequency range.

Effects of the sound field characteristics of the receiving room on heavy-weight impact sound measurement generated by impact ball (임팩트 볼에 의한 중량충격음 측정에 있어서 수음실 음장특성의 영향)

  • Yoo, Seung-Yup;Lee, Sin-Young;Jeong, Young;Jeon, Jin-Yong
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • /
    • pp.622-625
    • /
    • 2006
  • This study is a fundamental investigation for standardization of the heavy-weight floor impact measuring method by the impact ball. The distribution chrematistics of floor impact sound level and reverberation time in a receiving room of the testing building for floor impact sound were measured with variations of number and arrangement of the sound-absorbing materials. Total 8 cases were investigated. The distribution of the floor impact sound level($L_{i,\;Fmax}$) was measured at 30 points with same intervals. The absorption coefficient of the room is 0.10 in case of installation of 6 absorbing materials and 0.02 in case of non-installation. The distribution shape of the impact sound pressure level was similar to the result of the bang machine driving at the measured frequency range. However, the overall reduction of the impact sound level investigated in the 125 to 500 Hz shows that the sound absorption characteristics of the receiving room actually affects the result of the heavy-weight impact measurement.

  • PDF