• Title/Summary/Keyword: Room acoustics

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A Study on the Utilization of Computer Program for the Prediction of Rom Acoustics (실내음향 예측을 위한 컴퓨터 프로그램 이용에 관한 연구)

  • 김선우;최형욱;한명호
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 1997.10a
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    • pp.250-255
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    • 1997
  • The computer simulation and mock-up test are recently applied to the practical design for the room acoustics to predict and evaluate its characteristics. In this paper, the sound field properties predicted and evaluated by the computer simulation were compared to the measured data. Comparison and analysis between simulation data and measured data were performed for the Reverberation Time, Sound Pressure Level at the various measuring positions and frequencies and Definition, Early Decay Time, Speech Transmission Index.

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A Study on the Evaluation for Reduction Effect of Hydraulic Turbine Dynamo Noise after Establishment of Soundproof Measure (방음대책 수립 후 수차발전기 소음의 저감효과 평가에 관한 연구)

  • Yun, Jae-Hyun;Ju, Duck-Hoon;Kim, Jae-Soo
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2007.11a
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    • pp.133-137
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    • 2007
  • As the waterpower generation plant, the subject of this Study, is a facility that produces plenty of electricity corresponds to $196{\sim}240GWh$ annually, and in its generation process it creates a loud noise when the turbine related to the hydraulic turbine dynamo revolves, and since such loud noise must be transmitted to the dynamo room and amplified, it is effecting a lot of influences to the adjacent office and space. In such viewpoint, this Research, based on the soundproof measure presented at the preceding research, has attempted to evaluate about the effect of noise-reduction countermeasure against the hydraulic turbine dynamo using Auralizational Technique through Psycho-Acoustics Experiment. It deems that such result could be applied hereafter as the useful material when setting up a soundproof countermeasure for the hydraulic turbine dynamo room in dam.

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An Experimental Study on the Acoustics Characteristics of Music Hall with Round Form (원형평면을 갖는 공연장의 음향특성에 관한 실험적 연구)

  • Yun, Hee-Kyoung;Kim, Jae-Soo
    • Proceeding of Spring/Autumn Annual Conference of KHA
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    • 2003.11a
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    • pp.67-72
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    • 2003
  • The present article evaluates a performance hall, which improves sound efficiency. In general, the sidewall of the music hall is plane circle. thus there happens a focus phenomenon. To overcome it. the music hall improves its sound efficiency by making its sidewall irregular. After measuring impulse response from the performance hall, evaluation indices on the temporal distribution of sound energy such as RT, EDT, D50, C80, RASTI and BR were obtained, and based on them, indoor acoustic characteristics and the generation of echoes were determined. According to the results, evaluation indices showed that the acoustic condition was satisfactory in general. This study is to provide fundamental data for acoustic design of music hall with round form by analyzing the room acoustic characteristics of music hall.

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An Study on the Acoustics Characteristics of D's Small Performance Hall (D 문화체육센타 소공연장의 음향특성에 관한 연구)

  • Han, Kyeong-Yeon;Seo, Jung-Seok;Kim, Jae-Soo
    • Proceeding of Spring/Autumn Annual Conference of KHA
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    • 2004.11a
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    • pp.367-371
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    • 2004
  • The purpose of this research is furnishing of basic material for acoustic planning hereafter, after understanding the acoustic merits and demerits through measuring and analyzing on room acoustic of small performance hall. As the result of the measurement, those physical evaluation indexes such as SPL, RT, EDT, $D_{50}$, $C_{80}$, RASTI have being kept the satisfiable acoustic condition for the service of performance hall. Therefore, as small performance hall is regarded as equipped with sufficient volume of sound, reverberatory feeling and diffusive feeling, it judges as an excellent performance place, also it is considered that it could be utilized as a useful material when design so similar performance hall, hereafter.

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New Learning Hybrid Model for Room Impulse Response Functions (새로운 학습 하이브리드 실내 충격 응답 모델)

  • Shin, Min-Cheol;Wang, Se-Myung
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2007.11a
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    • pp.23-27
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    • 2007
  • Many trials have been used to model room impulse responses, all attempting to provide efficient representations of room acoustics. The traditional model designs for room impulse response seem to fail in accuracy, controllability, or computational efficiency. In time domain, a room impulse response is generally considered as the combination of three parts having different acoustic characteristics, initial time delay, early reflection, and late reverberation. This paper introduces new learning hybrid model for the room impulse response. In this proposed model, those three parts are modeled using different models with learning algorithms that determine the length or boundary of each model in the hybrid model. By the simulation with measured room impulse responses, it was examined that the performance of proposed model shows the best efficiency in views of both the parameter numbers and modeling error.

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New Learning Hybrid Model for Room Impulse Response Functions (새로운 학습 하이브리드 실내 충격 응답 모델)

  • Shin, Min-Cheol;Wang, Se-Myung
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.18 no.3
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    • pp.361-367
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    • 2008
  • Many trials have been used to model room impulse responses, all attempting to provide efficient representations of room acoustics. The traditional model designs for room impulse response seem to fail in accuracy, controllability, or computational efficiency. In the time domain, room impulse responses are generally considered as combination of the three Parts having different acoustic characteristics, initial time delay, early reflection, and late reverberation. This paper introduces new learning hybrid model for room impulse responses. In this proposed model, those three parts are modeled using different models with learning algorithms that determine the boundary of each model in the hybrid model. By the simulation with measured room impulse responses, the performance of proposed model shows the best efficiency in views of computational burden and modeling error.

An Analysis of the Acoustical Quality of Rooms Using Auditory Perception Tests (청감실험에 의한 실의 음향 특성분석)

  • 전진용
    • Proceedings of the Acoustical Society of Korea Conference
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    • 1998.06e
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    • pp.57-60
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    • 1998
  • This paper adopts the psychoacoustical methodology to evaluate the acoustical qualities of rooms and describes some of the results of an attempt to develop such a test. In order to investigate the effect of hall response to subjects, a subjective experiment was performed in artificially simulated sound fields. Pairs of sounds having differences in duration/frequency were presented to a subject and the subject's responses were recorded. The stimuli were varied through an auralization system that simulates three different rooms. It was found that duration/frequency discrimination is influenced by the room conditions and that these discrimination procedures may form the basis for assessment of room acoustics.

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A Study on the Evaluation of Acoustic Performance for Music Room in Middle School Using Auralization (가청화를 이용한 중학교 음악실의 음향성능 평가에 관한 연구)

  • Soul, Soo-Hwan;Kang, Gyu-Sun;Kim, Jae-Soo
    • Journal of the Korean housing association
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    • v.19 no.4
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    • pp.49-57
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    • 2008
  • The case study for this research is a middle school music room located in Iksan City, Korea. Although the room is used for teaching music, indiscreet sound-absorbing materials were applied within the space. Accordingly, a number of difficulties have been experienced when using the room. During a music lesson, the sound-volume is inadequate for music appreciation, while the music performance has an arid sound due to an insufficient echo. In order to control the obstructive factors resulting from a short Reverberation Time, the acoustic factor is optimized in this study by using an Acoustic Simulation, following an arrangement of Acoustic Design. A Psycho-acoustics Experiment was conducted using the Auralizational Technique, whereby the Virtual Acoustic Field can be experienced at the design stage.

Characteristics of Interior Noise at University Reading Room and User's Consciousness on the Noise (대학 독서실에서 발생하는 소음의 특성과 사용자 의식 분석 - C 대학교의 독서실을 대상으로 -)

  • Park, Hyeon Ku;Jong, Hye-Ran;Kim, Sun-Woo
    • KIEAE Journal
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    • v.10 no.4
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    • pp.39-44
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    • 2010
  • Reading room in the university is one of necessary facilities that university student must use. It is, therefore, very important to make reading room comfortable acoustically not only to minimize the annoyance to the users but also to provide efficiency in studying. Present study aims to investigate the current situation of reading room in terms of acoustics and moreover to find out the relationship between the indoor noise and users' satisfaction through questionnaire survey. As a result, the indoor noise level is quite higher than the 1st grade, 35 dB(A), that the Ministry of land, transport and maritime affairs suggests as certificate regulation for environment friendly building and there were lots of noise sources that can provoke users in studying or concentrating. Questionnaire survey illustrates that the sound when opening and closing door, and airborne sound from outdoor transmitted through window are most annoying, which affected users' dissatisfaction.

An Experimental Study on the Acoustic Characteristic of Korean Traditional Houses in Chonnam Province (전남 지방 전통주택의 음향특성에 관한 실험적 연구)

  • Lee, Tai-Gang;Kim, Hyung-Ryul;Kim, Hang;Choi, Eun-Suk;Kim, Sun-Woo
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2005.11a
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    • pp.686-689
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    • 2005
  • This study aims to analyzed the acoustics characteristics of Korean Traditional Houses in Chonnam Province varied with lay out and floor plane to reflect the way of control for environmental condition. These houses are surveyed the reverberation time and level difference between rooms of the main living room and other main floored room, master room and kitchen. As a result, the reverberation time of traditional rooms are below 0.6 second, and the sound insulation performance of Korean traditional door are mostly very low grade with D-15. The level difference between rooms are low grade not to meet minimum class except between main living room and master room away from main living building.

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