朝陽科技大學音響實驗室
地址 ： 台中縣霧峰鄉吉峰東路 168 號 建築及都市設計研究所
IntroductionIntroduction of Acoustical Laboratory in Chaoyang coustical
Chiung Yao Chen, Professor, Dept. of Archi., ChaoyangUniv. of Technology Laboratory in
Important Contributed Paper List Download
Hot news: The 6th International Symposium on Temporal Design
New published " http://www.intechopen.com/articles/show/title/contribution-of-precisely-apparent-source-width-to-auditory-spaciousness"
New published "http://acoustics.ippt.gov.pl/index.php/aa/article/view/1492"
New published
"http://www.intechopen.com/bppks/the-human-auditory-system-basic-features-and-updates-on-audiological-diagnosis-and-therapy"
Qualifications:
Doctor degree of Engineering, University of Kobe
Acoustics by Chiung Yao Chen - Established 2000
Professor, Dept. of Architecture, ChaoyangUniv. of Technology
Member of the International Institute of Acoustics and Vibration
Member of the International Institute of Temporal Design
Member of the Acoustical Society of Americam
Service
1. The computer modeling program “YMCAD” was developed by Yoichi Ando from Japan Kajima Technical Research Institute. These programs analyze a space with true 3-D acoustics.
2. The commercial program, “EASE 4.0”were originated by Dr. Wolfgang Ahnert of ADA (Acoustical Design Ahnert), Berlin, the Enhanced Acoustic Simulator for Engineers (EASE) has developed over several versions for sound system modeling software. The program, which helps architects, engineers, consultants and contractors discover sonic characteristics before a building is finished, has enhanced capabilities.
- Derivation and solution of acoustics equations for unique answers to difficult problems
- Architectural acoustics design
- Identification of noise sources
- Noise isolation calculations and measurements
- Written report of architectural acoustics recommendations
- Review of architectural drawings for conformance to architectural acoustics recommendations
- Design audio-visual systems
- Provide written performance specifications for the audio-visual system
- Technical review of audio-visual contractor bids
- Technical review of submittals for architectural acoustics products
- Inspect construction for conformance to acoustics requirements
- Inspect audio-visual system installation
- Oversee testing of audio-visual system
- On-site testing of architectural acoustics
Laboratory testing of barrier sound transmission loss
Academic Topics:
Theory of Environmental Planning based on Human Psychological and Physiological Responses
To design superior environment for human sensibilities, it is first necessary to find the relationship between physical attributes of the environment and human psychological responses. That is, the theory of environmental design can be found by defining physical factors that determine psychological evaluation in the environment and an optimum condition of each factor. Besides, the environment which surrounds us is perceived and transferred to our brain as physiological signals which deeply related to subjective preference due to the primitive response. Therefore, physiological responses can be grasped as objective parameters of the psychological responses.
The visual and auditory environments are the main subjects of the research activities in this laboratory aiming at the creation of superior environment to develop human sensibilities by approaching them from both phases of psychological and physiological responses. What is important here is that satisfying each individual sensibilities leads to the whole satisfaction. However, the converse is not true. From this point, this laboratory also promotes the study of the individual difference of subjective evaluation.
Introduction of Research Activities
The following contents are briefly introduced here. All the detailed themes of the researches are introduced in the pages of " Research activities ".
1. Visual Environments
2. Model of Auditory Brain System / Visual Brain System
3. Individual Differences
4. Architectural Acoustics and Opera House Acoustics
5. A system of regional environmental noise identification and its subjective evaluation
1. Visual Environments
We are surrounded by the natural environment. Various elements constituting the natural environment are changing in a second, a day, four seasons etc. and developing our human brain. Then, to find standards of visual environmental design, the temporal analyses of the physical attributes of the elements such as fire, water and leaves and the relationship between the physical attributes and the psychological evaluation are being studied.
Besides, as the basic study on the dynamic visual environment blending with human, psychological evaluations for every movement are being performed.
2. Model of Auditory Brain System / Visual Brain System
To examine the auditory brain system, the slow vertex response (SVR) and the alpha-wave of the continuous brain wave (CBW) were analyzed and each characteristics corresponding to the subjective preference are being found. Also, each hemisphere dominance or specialization of the human brain were indicated in changing the physical factors of sound fields. The left hemisphere is associated with temporal factors; the delay time of the first reflection (Delta t1) and subsequent reverberation time (Tsub), and the right hemisphere is concerned with spatial factors; listening level (LL) and the interaural cross correlation (IACC).
It is assumed that the auditory brain model has the similar system to the visual brain model and can be applied to the visual environment.
3. Individual Differences
In the auditory environment such as a concert hall and an opera theater, the creation of the environment which satisfies each individual sensibilities means the seat selection to fit subjective preference of each audience. Then, the individual differences and inter-individual differences of subjective preference in sound fields and visual fields are being studied.
4. Architectural Acoustics and Opera House Acoustics
To realize the superior sound field in a concert hall and an opera house, "how much the music, the sound field, and the audience are blending each other" is important. Theory of designing sound fields with four physical factors is being applied.
5. A system of regional environmental noise identification and its subjective evaluation
Environmental noise is usually evaluated statistically as a “monaural” sound pressure level, measured by a sound level meter and its spectrum. For the environmental noises such as aircraft, traffic, railway noise, binaural measurements should be conducted to reflect human psychological or physiological aspects. Then, a system of regional environmental noise identification and its subjective evaluation has been developed, based on the model of the human auditory-brain system.
Introduction of Research Projects :
The following contents are briefly introduced here. All the detailed themes of the researches are introduced in the pages of
"Research projects".
1. Relationship between physical factor and psychological responses for concert hall design
2. Noisy level with respect to apparent moving noise source – Case study on traffic noise
3. Speech intelligibility for an auditorium space in Taiwan area with Chinese – A study of the sound articulation using monosyllables
4. Detection of the slow vertex responses (SVR) in human brain for the speech intelligibility sensibility by using EEG
1. Relationship between physical factor and psychological responses for concert hall design
The purpose of this study is to build a calculating model for simulation of the chamber acoustic quality with respect to sound clarity of auditorium before construction. The method of this study is a psychological process utilized using the temporally physical factors mentioned by Ando1. The factors are: 1) delay time of first reflection, Dt1; 2) subsequence reverberation time, Tsub. Ando1 discussed the correlation among these physical parameters by using subjective assessment test (paired-comparison). He found that there were independent characteristics in subjective psychological perception among these factors, and proved that these two factors will covered all the possible temporally physical factors which affect the acoustic quality of auditorium. We found2 the relationship between sound definition and Dt1 by paired – comparison method. But the Tsub of a hall is summed up by all subsequence reflections, and the sound clarity has to synthesize these two physical factors as consideration.
Furthermore, the simulation method by employment of the subjective assessment as foundation in this study is different in assessment items and contents with general semantic difference psychological assessment. These generally used building acoustic assessments item are definition, transparency, spaciousness, intimacy, timbre and diffusion etc. There are no direct correlation and attribution with the related physical parameters of the chamber acoustic quality. There are vulnerable to induce language confusion of non-musical and non-acoustic undertaker between these items and resulting in invalid judgment. Thus, in order to broaden the practical value of the calculation model based on these two physical parameters, i.e. replace the pronoun of the subjective perception in assessment and prediction. The relationship between physical factors and sound clarity using factors Dt1, Tsub will be a new approach of physical expectations in this study.
2. Noisy level with respect to apparent moving noise source – Case study on traffic noise
The purpose of this study is to compare the disturbed degree on speech by an immovable noise source and an apparent moving noise (AMN). In the study of the sound localization, we found that source directional sensitivity (SDS) is associated with the magnitude of inter- aural cross correlation (IACC). Ando, Y. (1987) reported that potential correlation between left and right inferior colliculus at auditory-path in the brain is in harmony with the correlation function of amplitude input into two ear-canal entrances. We assume that the degree of disturbance for our conversation under an apparent moving (16 degrees / sec) noise source is probably different from that of being fixed at the front of us within a constant distance in a free field (none reflection). Finally, we found there is significantly influence on speech intelligibility between a moved and a fixed noise source generated by 1/3 octave, centered at 2000 Hz band noise in a preliminary study. Furthermore, this phenomenon was reconfirmed by using the subjective evaluation (JND method) to detect whether the masking effects will be changed or not, as the moving speed was tuned up to 128 degrees / sec.
3. Speech intelligibility for an auditorium space in Taiwan area with Chinese – A study of the sound articulation using monosyllables
Evaluative standard of speech intelligibility for an indoor sound field has been studied for a long time. In the auditorium, the acoustical quality of the speech intelligibility will be harmed by too long and too many reflections. Rapid speech intelligibility index (RASTI) is derived from a simple measurement for evaluation of a sound field. The purpose of this study is to realize the relationship between Chinese articulation standard and the RASTI ratio in Taiwan. The compounded vowels of the single Chinese syllable were applied to generalize 108 phonemic for constitution of the test table in intelligibility score, according to Chinese articulation standard in Taiwan area. In this research, we surveyed 8 auditoriums in Taiwan sound field (back ground noise are all under NC-40). The results show the better correlation between RASTI ratio and intelligibility scores (r= 0.90,R2= 0.82). Furthermore, we found the intelligibility score of some special Chinese syllables are inner differences (p < 0.001) for some measurement tables.
4. Detection of the slow vertex responses (SVR) in human brain for the speech intelligibility sensibility by using EEG
Publications (since 1996)