• Title/Summary/Keyword: Room acoustics

Search Result 101, Processing Time 0.034 seconds

The effect of a slat ceiling on the acoustics of a small performance space (슬랫천장이 소규모실의 음향에 미치는 영향)

  • Oh, Yedam;Lee, Hyojin;Jeong, Daeup
    • The Journal of the Acoustical Society of Korea
    • /
    • v.37 no.5
    • /
    • pp.363-368
    • /
    • 2018
  • Recently a slat type ceiling is widely used in various spaces, such as music performance spaces and concourse of airport and a general reception area of a building. However, it is hard to find a proper design guideline or material useful in designing such spaces, due to the lack of relevant researches on the effect of a slat ceiling on room acoustics. The present work investigated the effect of a slat type ceiling using a physical scale model method. A 1/20 scale model of a small shoe-box type music performance hall was built and a slat ceiling with different configurations was installed. 6 cases of different ceiling configurations were considered with the combination of 2 slat ceiling height cases and 3 distance cases between slats. The effect of a slat ceiling on the acoustics of a room was evaluated by measuring reverberance($T_{30}$), intelligibility and clarity($D_{50}$ and $C_{80}$), and loudness(G and $G_{80}$).

The Measurements and Evaluations on the Configurations of Absorptive and Diffusing Treatments in Classrooms using a Scale Model (축소모형법을 이용한 흡음재와 확산체 배치조건별 교실의 음향성능 측정 및 평가)

  • Choi, Young-Ji
    • Journal of the Korean Institute of Educational Facilities
    • /
    • v.20 no.1
    • /
    • pp.37-44
    • /
    • 2013
  • The present study examines the effects of periodic type diffusers for producing the preferred acoustics for speech and determines the more successful configurations of sound-absorbing and diffusing treatments for achieving good acoustics in classrooms. The measurements were carried out in a 1/10 scale model classroom systematically adding diffusers to one or more of four surfaces of the room. A total of 13 combination of diffusers with absorptive treatments were investigated. Adding diffusers on the ceiling were more effective to increasing the early-arriving reflection energy($G_{50}$) than adding absorptive materials on the entire ceiling. The late arriving reflection energy($G_{late}$) was decreased with increasing amounts of diffusing treatments of upper front or rear wall and this resulted in achieving higher early-to-late ratios($G_{50}$). Adding diffusers on the upper front wall($AC_{100}DUFW_{26}$) achieved more uniform acoustical conditions over the receiver positions than adding diffusers on the upper rear wall($AC_{100}DUFW_{26}$). Adding diffusers on the ceiling and absorptive materials on the lower front wall($AC_{75}DC_{25}ALFW_{26}$) achieved better acoustical conditions than adding the absorptive materials on the entire ceiling and lower front wall($AC_{100}ALFW_{26}$).

Study for Improving Acoustic Characteristics of the Conference Room (회의장에서의 실내음향특성 개선에 관한 연구)

  • 김상수;황효성;박영원;채장범
    • The Journal of the Acoustical Society of Korea
    • /
    • v.19 no.2
    • /
    • pp.73-82
    • /
    • 2000
  • This paper presents a significant improvement achieved in the acoustic characteristics of a conference room of I-company originally designed and built without consideration for room acoustic characteristics. The reverberation time of the room was excessive, which resulted in poor 'Definition' for speech. Thus the improvement of room acoustic characteristics was required. In this study, experiments and simulations using the principles of geometrical acoustics were executed to improve the acoustic characteristics in the room. By performing a series of simulation, it has become possible to predict acoustic parameters for an improvement plan. And the improvement plan of room acoustic characteristics was established. And for the verification of the simulation results, the experimental data were compared and evaluated against those from the simulation. Additionally, the proposed method in this paper demonstrated its effectiveness by successfully improving the room acoustic characteristics resulted from repair construction.

  • PDF

A Study on the Sound Effect for Improving Customer's Speech Recognition in the TTS-based Shop Music Broadcasting Service (TTS를 이용한 매장음원방송에서 고객의 인지도 향상을 위한 음향효과 연구)

  • Kang, Sun-Mee;Kim, Hyun-Deuc;Chang, Moon-Soo
    • Phonetics and Speech Sciences
    • /
    • v.1 no.4
    • /
    • pp.105-109
    • /
    • 2009
  • This thesis describes the method for well voice announcement using the TTS(Text-To-Speech) technology in the shop music broadcasting service. Offering a high quality TTS sound service for each shop requires a great expense. According to a report on the architectural acoustics the room acoustic indexes such as reverberation time and early decay time are closely connected with a subjective awareness about acoustics. By using the result the customers will be able to recognize better the voice announcement by applying sound effect to speech files made by TTS. The result of an aural comprehension examination has shown better about almost all of the parameters by applying reverb effect to TTS sound.

  • PDF

A Study on the Theory of Simulation Rule for Scale Model Experiment in Architectural Acoustics (건축음향모형실험의 상사법칙의 이론에 관한 연구)

  • Kim, Cheon-Su;Sin, Yeong-Mu;Park, Byeong-Jeon
    • The Journal of the Acoustical Society of Korea
    • /
    • v.13 no.1
    • /
    • pp.93-98
    • /
    • 1994
  • This study aims to find the theoretical consideration of the basic simularity rule between scale model experiment and real building as a results ; 1. In the case of room acoustics, $f_m=n\cdot{f_r}\;T_m=T_r/n\; \alpha_m(f_m)=\alpha_r(f_r)$ 2. That of sound Insulation : $TL_m(f_m)=TL_r(f_r)$

  • PDF

Report on the Research of ISO/WD 18233 - Application of new measurement methods in building acoustics (ISO/WD 18233 - 건축음향에서의 새로운 측정방법의 적용)

  • Kook, Chan;Kim, Sun-Woo;Rindel, J.H.
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2003.11a
    • /
    • pp.851-856
    • /
    • 2003
  • The study on the new measurement method of room acoustics is now in process in the ISO TC43/SC2/WG24 New standard(WD 18233) is dealing with the MLS, swept sinusoidal signal and impulse. This working group is composed of more than 20 specialists in 10 countries and the convener is professor J.H.Rindel in technical university of Denmark. The meeting of WG24 was held in the DIN, Berlin at 23rd. this september and the results was sent to the secretary of ISO TC43/SC2 for the circulation. Brief information of ISO/WD18233 and the result of this meeting is given here.

  • PDF

Room Acoustic Properties of Coupled Rooms Connected by an Aperture in the Steady State Condition (정상상태조건에서의 개구부로 연결된 커플룸의 음향 특성)

  • Na, Hae Joong;Lim, Byoung-Duk
    • Transactions of the Korean Society for Noise and Vibration Engineering
    • /
    • v.26 no.3
    • /
    • pp.315-322
    • /
    • 2016
  • Room acoustic properties of coupled rooms connected by an aperture has been analyzed using statistical acoustic model based on the diffused sound field assumption, which has limitation in dealing with the parameters such an room geometries and non uniform absorptivity of the boundary surfaces. In order to overcome these difficulties the acoustic diffusion model has been introduced, by which distribution of the acoustic energy density can be analyzed for various shapes and wall absorptivity. In this study acoustic properties of coupled rooms connected by an aperture(e.g. door) is analyzed using acoustic diffusion equation, which is solved numerically. The mean energy densities of two rooms obtained by the diffusion model are compared with those from the statistical model. The results show good agreement for various coupling aperture sizes and absorption coefficients. For a limiting case when the partition wall is substituted by an aperture and the two rooms eventually forms a single room, results of coupled room analysis using diffusion model show good agreement with those of a single room.

Improved methods for measuring early reflections from Five-channel room impulse response using newly introduced Peak-Detecting algorithm

  • Kim Lae-Hoon;Doo Sejin;Oh Yangki;Lee Heewon;Sung Koeng-Mo
    • Proceedings of the Acoustical Society of Korea Conference
    • /
    • spring
    • /
    • pp.439-442
    • /
    • 2000
  • When we measure the acoustical properties of a room using multiple microphone system, it is important to grasp exact time delay of the early reflections from impulse response pair. But it is often very difficult to identify the early reflections in natural shape, because a waveform may be deformed due to the characteristics of a sound source loudspeaker, microphone and reflected wall and overlapping of plural waveform. In this paper to obtain more accurate and enough early reflections, we propose the brand-new five-channel sound receiving system and introduce peak-detecting algorithm. The system has microphones mounted at the origin and four points of a regular tetrahedron. The newly introduced peak-detecting algorithm can show exact peak position in each channel, in spite of deformation due to reflected walls, loudspeaker and microphone.

  • PDF