• Title, Summary, Keyword: Acoustics

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An Inquiry Over Characteristics of British Acoustics in the Nineteenth Century: Focusing on Its Interaction with Music (19세기 영국 음향학의 특성 탐구: 음악과의 상호작용을 중심으로)

  • Ku, Ja-Hyon
    • The Journal of the Acoustical Society of Korea
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    • v.25 no.2
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    • pp.72-77
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    • 2006
  • British acoustics in the nineteenth century is important as a foundation for modern acoustics in the history of acoustics. The Purpose and objective of acoustics was different from those in modern age. and musical motivation was distinguished among them. This study intends to clarify various aspects of interaction between music and acoustics in nineteenth-century Britain by examining related materials in both published and unpublished forms. Then music Provided acoustics with instruments, subjects, and personnel, and acoustics did much as musical science in helping to improve and develop musical scales and enhancing the exactness of measurement of absolute pitches. Music played an essential role in developing acoustics to a modern discipline in Europe, especially in Britain. all through the nineteenth century.

Subjective Evaluation of Stage Acoustics with the alteration of the sound pressure level of reverberation. (잔향음압의 변화에 대한 무대음향의 주관적 평가)

  • Kim, Young-Sun;Jeong, Jeong-Ho;Jeon, Jin-Yong
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.742-742
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    • 2003
  • This study is about the effect of the sound pressure level of reverberation on stage acoustics. There are several electro-acoustics systems to enhance the room acoustics of concert hails but not many studies on the stage acoustics for the musicians who plays on the stages. To investigate the effect of reverberation on stage acoustics, the reverberation time of a test room has been controlled through a 4 channel speaker system, and the preferred reverberation level has been selected by performing musicians. As a result, the sound pressure level of reverberation seems to affect the perception of stage acoustics which motivates musicians' performances.

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The Dependence of Frequency Change Perception on the Acoustics of a Listening Environment and Its Implication for the Evaluation of Room Acoustics

  • Jeong, Dae-Up
    • The Journal of the Acoustical Society of Korea
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    • v.18 no.4E
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    • pp.10-19
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    • 1999
  • Psychophysical approaches to the room acoustics have been made in number of researches. The present study is looking at whether the listener's perception of frequency change in rooms are dependent on the acoustics of a listening environment. P(C)s for frequency change in short tones were measured in different listening conditions. Two experiments were carried out to investigate the influence of room acoustics on the listener's perception of frequency change, and its implication for evaluating the acoustics of listening environments were examined and discussed. It was found that the temporal and spectral contents of reflections from room surfaces might be an important factor which influenced the listener's perception of frequency change in a reverberant sound field. This implicates that psychophysical approach by measuring listener's frequency change perception might be an useful tool for evaluating room acoustics. However, cares should be taken, since some individual differences were found to exist with respect to the direction of frequency change.

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Noise and Vibration Reduction by using the Band Gap Phenomenon (밴드 갭 현상을 이용한 소음, 진동 차단)

  • Kim Hyun-Sil;Kim Jae-Seung;Kang Hyun-Ju;Kim Bong-Ki;Kim Sang-Ryul
    • Proceedings of the Acoustical Society of Korea Conference
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    • pp.287-290
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    • 2000
  • In periodic structures where two or more materials of different density and sound speeds are arranged, there exist stop bands, in which waves cannot propagate. In this paper noise and vibration reduction by using band gap phenomena is discussed. The general theoretical background is presented and experimental results for acoustic wave attenuation in 2D cylinder arrays are described.

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Curriculum Development of Acoustics and Audio Engineering on Digital Convergence Environment (디지털 융복합 환경을 고려한 음향 및 오디오 기술 교육과정 개발)

  • Oh, Wongeun;Rhee, Esther
    • The Journal of The Institute of Internet, Broadcasting and Communication
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    • v.13 no.2
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    • pp.191-197
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    • 2013
  • In this paper, we present the college curriculum for the acoustics and audio engineering on digital convergence environment. For these purposes, we categorized the colleges which linked on the ASA and AES websites into three types according to their characteristics such as an acoustics-oriented type, an applied-acoustics type, and a convergence-oriented type. And a basic step-by-step curriculum model for the audio acoustics is suggested based on the characteristics of the category analysis. The proposed model can be effectively used to build an acoustics and audio technology course at the domestic colleges.

Sound Quality Evaluation of Turn-signal of a Passenger Vehicle based on Brain Signal (뇌파 측정을 이용한 차량 깜빡이 소리의 음질 평가)

  • Shin, Tae-Jin;Lee, Young-Jun;Lee, Sang-Kwon
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.22 no.11
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    • pp.1137-1143
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    • 2012
  • This paper presents the correlation between psychological and physiological acoustics for the automotive sound. The research purpose of this paper is to evaluate the sound quality of turn-signal sound of a passenger car based EEG signal. The previous method for the objective evaluation of sound quality is to use sound metrics based on psychological acoustics. This method uses not only psychological acoustics but also physiological acoustics. For this work, the sounds of 7 premium passenger cars are recorded and evaluated subjectively by 30 persons. The correlation between this subjective rating and sound metrics is calculated based on psychological acoustics. Finally the correlation between the subjective rating and the EEG signal measured on the brain is also calculated. Throughout these results the new evaluation system for the sound quality on interior sound of a passenger car has been developed based on bio-signal.

The Study on Asymmetry between Acoustics and Perception of the Temporal Cues of English Plosives (영어파열음 시구간신호의 음향과 지각 비대칭성 연구)

  • Kang Seok-Han
    • MALSORI
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    • v.55
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    • pp.15-31
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    • 2005
  • This study tests the hypothesis that the voiced-voiceless distinction is influenced by the relationship between acoustics and perception. Production and perception tests are conducted with temporal cues in different environments(CV, VCV, VC). The result showed that acoustic cues indicating significant difference between voiceless/voiced plosives do not behave just as do in perception. The result also showed that there existed an asymmetry between acoustics and perception.

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The Effects of Air Conditioner Noise on Classroom Acoustics (교실 음향에 대한 에어컨 소음의 영향)

  • Kim, Su-Yeon;Jeon, Jin-Yong
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.176-179
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    • 2005
  • A case-study in classroom acoustics was conducted and the effects of two types(system air conditioner and packaged air conditioner) of air conditioner were investigated. Acoustical measurements were made in two different classrooms. Each classroom has different acoustics showing sound quality of air conditioner. Mental concentration test was conducted to evaluate the effects of air conditioner noise with different sound presure level(dBA). Speech intelligibility test was also planed with adopting Korean phonetic balanced words.

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