• Title, Summary, Keyword: Sound characteristics

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Luxuriousness Sound Quality Index Development of Electrically Powered Roller Blind (차량용 전동 롤러 블라인드의 고급감 음질지수 개발)

  • Sung, Weonchan;Jo, Hyeonho;Kang, Yeon June;Kim, Seonghyeon;Park, Dongchul
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.25 no.5
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    • pp.345-351
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    • 2015
  • Sounds of electrically powered vehicle components such as window lift system, roller blind, etc., are required to be more comfortable and not to irritate the people emotionally. In this paper, a study was conducted to identify the significant sound quality metric and compose the luxuriousness sound quality index of electrically powered vehicle roller blind which is part of vehicle sunroof system. Before conducting subjective evaluation, sound characteristics of roller blind was analyzed and set the target operating sound for subjective evaluation. Thus, transfer sound of roller blind which has the characteristics of sound modulation was used for subjective evaluation. Multiple linear regression analysis was carried out by chosen Zwicker's metrics which are pointed by comments of jurors. Loudness and sharpness related metrics are prime metrics in luxuriousness sound quality index we composed. Also, effect of roller blind assay when it is attached to real vehicle was identified to evaluate the validity of index.

Experimental Analysis on Acoustic Characteristics of the Sound-Pipe of King Song-Dok Bell (실험적 분석을 통하여 본 성덕 대왕(聖德 大王) 신종(神鐘) 음통(音筒)의 음향학적 특성)

  • Yoon, Doo-Byung;Kim, Yang-Hann
    • The Journal of the Acoustical Society of Korea
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    • v.16 no.6
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    • pp.19-24
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    • 1997
  • The acoustic characteristics of the sound-pipe of King Song-Dok bell, which is located on the top, are investigated by experiment and simulation. The experimental results;reflection coefficient, and radiation impedance, demonstrate that the sound-pipe is capable of radiating high frequency(above 300Hz) sound; it behave as damper. It is also found that a waveguide model well presens the acoustic characteristics of the sound-pipe.

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A experimental study for the characteristics of impulse noise caused by shooting of K-7 silenced assault rifle (K-7소음총의 사격음 특성에 대한 실험적 연구)

  • Lee Jin-Ho
    • Journal of the Korea Institute of Military Science and Technology
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    • v.7 no.4
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    • pp.36-43
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    • 2004
  • In 1909 Hiram P. Maxim invented one of the first metal silencers for reducing sound levels in firearms. Silenced me have been mainly applied in the hunting and military operation. In particular special force make use of silenced rifle because it is low sound level. This paper considers experimental analysis for the characteristics of shock wave caused by shooting of a silenced me. Experimental results Indicate that the sound level of K-7 silenced rifle was lower than the sound level of MP5 silenced rifle. And, Sound Power Level of K-7 silenced rifle at a distance more than 75m or loom have nearly the constant value. This results that suggested the characteristics data about K-7 rifle's impulse noise will be apply to design the silencer of a small arms.

Sound Quality Characteristics for Interior Noise of High Speed Train (음질평가를 통한 고속철도 실내소음의 객관적.주관적 특성 분석)

  • Park, Buhm;Kim, Dong-Kyu;Jeon, Jin-Yong;Choi, Sung-Hoon;Park, Jun-Hong
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.20 no.8
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    • pp.774-781
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    • 2010
  • In Korea, the high-speed train is one of the most important mass transportation. Due to its fast speed, the interior noise level is high and it is one of major reason for passenger complaints. In this study, the response of passengers to interior noise was evaluated using sound quality parameters. The effects of various parameters, such as train types, travel speed, rail road, on the calculated sound quality were investigated. The characteristics of interior noise were identified. The obtained results were compared to auditory experimental data. For precise comparison of noises of similar loudness but with different characteristics, paired comparison method was used. From the comparison, important parameters that have influence on the annoyance and loudness of the noise were determined.

Sound Absorption Characteristics of Building Interior Decoration Materials (건축내장재의 흡음 특성)

  • Kang, Dae-Joon;Lee, J.W.;Gu, J.H.;Park, H.K.
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.17 no.3
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    • pp.201-206
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    • 2007
  • It is important to consider the sound absorption characteristics of building interior decoration materials when we design a building and simulate acoustics in a room. The purpose of this study is to accumulate acoustic data on building interior decoration materials and give a basic data for improving the sound absorption performance by testing the sound absorption coefficients of 9 types of ceiling materials, 14 types of wall papers and 20 types of floor papers.

Sound Quality Analysis for Axle-Gear Whine Sound (액슬 와인 음질에 대한 연구)

  • Kim, Tae-Gyu;Lee, Sang-Kwon;Jo, Yun-Kyoung;Kim, Jong-Youn
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.141-146
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    • 2007
  • A gear whine sound due to the axle system is one of the most important sound qualities in a sport utility vehicle (SUV). In the previous research about the gear whine sound, it was known that it is difficult to evaluate the gear whine sound objectively by using the only A-weighted sound pressure level because of the masking effect. In this paper, for the objective evaluation of the axle-gear whine sound, the characteristics of the axle-gear whine sound is at the first investigated based on the synthetic sound technology and the new objective evaluation method for the axle-gear whine sound is developed by using the sound metrics, which is the psychoacoustics parameters, and the artificial neural network (ANN) used for the modeling of the correlation between objective evaluation and subjective evaluation.

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A Study on the Propagation Characteristics of Fire Alarm Sound in Buildings (화재비상경보음의 건물 내 전달특성에 관한 연구)

  • Baek, Eun-Sun
    • Fire Science and Engineering
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    • v.23 no.5
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    • pp.153-160
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    • 2009
  • This study aims to review the propagation characteristics of fire alarm sound in building through computer simulation. In order to achieve this goal, the sound power level of existing three different emergency alarms were measured in an anechoic chamber. Sound power level of alarm bell was 98.6dB and electronic-siren speaker was 95.7dB, and electronic-siren phon was 101.8dB at the voltage of DC 24V in the condition of anechoic chamber. As the results of acoustic simulation, it was shown that sound levels at the corridor of the building were relatively high and even. But, there were large difference in sound level at all the frequency bands between corridor and lecture rooms. This mean that alarm sound couldn't be recognized sometimes in lecture rooms. Through the computer simulation, the propagation characteristics of fire alarm sound could be forecasted and compared due to plans of buildings.

Enhancement of the 3D Sound's Performance using Perceptual Characteristics and Loudness (지각 특성 및 라우드니스를 이용한 입체음향의 성능 개선)

  • Koo, Kyo-Sik;Cha, Hyung-Tai
    • Journal of Broadcast Engineering
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    • v.16 no.5
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    • pp.846-860
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    • 2011
  • The binaural auditory system of human has ability to differentiate the direction and the distance of the sound sources by using the information which are inter-aural intensity difference(IID), inter-aural time difference(ITD) and/or the spectral shape difference(SSD). These information is generated from the acoustical transfer of a sound source to pinna, the outer ears. We can create a virtual sound system using the information which is called Head related transfer function(HRTF). However the performance of 3D sound is not always satisfactory because of non-individual characteristics of the HRTF. In this paper, we propose the algorithm that uses human's auditory characteristics for accurate perception. To achieve this, excitation energy of HRTF, global masking threshold and loudness are applied to the proposed algorithm. Informal listening test shows that the proposed method improves the sound localization characteristics much better than conventional methods.

An acoustical characteristics of sound proof panel for high speed train (고속전철용 방음패널의 음향특성 평가)

  • 서재갑;정성수;서상준;조문재;나희승;양신추
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.145-149
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    • 2001
  • In this study, an acoustical characteristics of sound proof panel for high speed train was performed. A sound absorption coefficient and transmission loss of sound proof panels for high speed train were tested in reverberation chambers and compared those of ordinary sound proof panel. The effect of noise barrier was simulated by using ray noise program with measured sound absorption coefficient for high speed train case and for ordinary case.

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Recognition of the Direct and Reflected Sounds in an Irregulary Formed Chamber (비정방형실내에서의 직접음과 반사음 식별에 관한 연구)

  • 차일환;박규태;임광호
    • The Journal of the Acoustical Society of Korea
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    • v.2 no.1
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    • pp.11-19
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    • 1983
  • An irregulary formed chamber was designed and constructed to recognize the direct sound radiated from the sound source and the reflected sound from the walls of the chamber. The sound signal used was tone burst in the frequency response characteristics with the signal detection after transient effect. The direct wave, transient phenomena and the primary reflected sound could be asiily distinguished each other by measurements of the arrival time of the time difference. And also noise could be easily distinguished by the same method. The result obtained can be used in industries for automatic measurement of the sound pressure reponse characteristics with respect to frequencies.

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