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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
The Journal of the Acoustical Society of Korea
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Journal DOI :
The Acoustical Society of Korea
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Volume & Issues
Volume 6, Issue 4 - Dec 1987
Volume 6, Issue 3 - Sep 1987
Volume 6, Issue 2 - Jun 1987
Volume 6, Issue 1 - Mar 1987
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Different Effects of Sound Stimuli on Performing Left-and Right-Hemispheric Tasks
Gang, Seong-Hun ; Ando, Y. ; Cha, Il-Hwan ;
The Journal of the Acoustical Society of Korea, volume 6, issue 2, 1987, Pages 5~14
In order to examine the different effects of noise and music on mental tasks, an addition of figures as a left-hemispheric task and a pattern search as a right-hemispheric task were given to elementary school pupils under conditions of jet noise stimulus, music stimulus, and no-sound stimulus, respectively. Results showed that effects of music and noise stimuli during these tasks were significantly different. The subjects under music stimulus tended, when performing additions, to show occasional short periods in which they produced substantially less than their own average rate of work. This is due to interaction between calculation and hearing music in the left hemisphere, whereas there was no detrimental effects on the task of addition under noise stimulus as well as no-sound stimulus because the addition and the noise may be separately processed in different cerebral hemispheres. As effects of noise on performing search task, the subjects tended to show instantaneous agitations in their working curves. Since noise with no-meaning is processed in the right hemisphere, it may be explained as an interacting effect in this hemisphere.
Multiplication Free Adaptive Digital Filter
Park, Tae-Ho ; Cha, Il-Hwan ; Yun, Dae-Hui ;
The Journal of the Acoustical Society of Korea, volume 6, issue 2, 1987, Pages 15~18
Multiplication free adaptive digital filtering algorithms are discussed. The proposed. The proposed algorithm uses delta modulation digital filter and the relevant filter weights are updated using the SIGN algorithms to realize an adaptive digital filter without multiplication operations. It is shown that the resulting algorithm can be implemented using simple up/down counting operations. The convergence characteristics of the proposed adaptive digital filtering algorithm and .others are investigated for a system identification problem.
A study on the absorption coefficient of an artificial perforated material
Pyo, Sun-Chan ; Yun, Seok-Wang ;
The Journal of the Acoustical Society of Korea, volume 6, issue 2, 1987, Pages 19~29
The absorption coefficients of various length bundles of straws simulating perforated material were studied both theoretically and experimentally. For the theoretical predictions Zwikker and Kosten's theory was modified by adapting Biot's theory based on Poiseuille flow. The experimental data were collected using an impedance tube where the attenuation along the length of the tube was considered. The theoretically predicted values agreed very well with the experimentally measured ones for frequencies lower than 700Hz with bundles shorter than 120mm in length placed against the rigid end of the impedance tube. Configurations with an air gap between the end of a bundle and the rigid end were also investigated. Absorption coefficients were higher for 150mm bundles than for those of combined/air gap configurations with a total length of 150mm. Also for the fixed bundle lengths, absorption was found to increase with increasing air gap.
A Study on the Formant Analysis of Korean Monophthongs and their Resonance Effect in Vocal Tract
Sin, Hyeon-Jae ; Yun, Seok-Wang ;
The Journal of the Acoustical Society of Korea, volume 6, issue 2, 1987, Pages 30~37
Twelve Korean monophthongs were studied by formant analysis, fundamental frequencies and their harmonics were considered as the parameters of analysis. The analyzed data were twelve Korean monophthongs which were pronounced with the five fundamental frequencies by the five male vocal musicians. The study shows that the first and the second formants are characterized by the resonance of the cavities of pharymx and mouth, respectively. The lip rounding effect detreases the second formant frequency. The phonemes of
were not distinguished well in this formant analysis.
The Analysis and Recognition of Korean Speech Signal using the Phoneme
Kim, Yeong-Il ; Lee, Geon-Gi ; Lee, Mun-Su ;
The Journal of the Acoustical Society of Korea, volume 6, issue 2, 1987, Pages 38~47
As Korean language can be phonemically classified according to the characteristic and structure of its pronunciation, Korean syllables can be divided into the phonemes such as consonant and vowel. The divided phonemes are analyzed by using the method of partial autocorrelation, and the order of partial autocorelation coefficient is 15. In analysis, it is shown that each characteristic of the same consonants, vowels, and end consonant in syllables in similar. The experiments is carried out by dividing 675 syllables into consonants, vowels, and end consonants. The recognition rate of consonants, vowels, end-consonants, and syllables are
respectively. In conclusion, it is shown that Korean syllables, divided by the phonemes, are analyzed and recognized with minimum data and short processing time. Furthermore, it is shown that Korean syllables, words and sentences are recognized in the same way.
Depth dependence of the low frequency propagation loss for the sea surface noise sources
Na, Jeong-Yeol ;
The Journal of the Acoustical Society of Korea, volume 6, issue 2, 1987, Pages 48~53
The depth dependent sound fields have been calculated for a single frequency source to reveal the fluctuating sound energy at both near the surface and the bottom of the water layer. Those fluctuation are mainly due to the mode function behavior along the depth where the sound-speed gradient acts like trapping lower mode sound energy in those medium.
The Estimation of Sound Attenuation Caused by Duct Silencer Using Sound Intensity Method
Kim, Seok-Hong ; Son, Jang-Yeol ; O, Jae-Eung ; Kim, Yeo-Sik ;
The Journal of the Acoustical Society of Korea, volume 6, issue 2, 1987, Pages 54~61
This paper is to suggest the test method of sound attenuation caused by absorptive duct silencer using sound intensity method in field. In order to estimate sound attenuation, sound power being radiated from sound power source and duct exhaust terminal was measured by the sound pressure method and sound intensity method in semianechoic and common room. The results of the measured sound attenuation values by sound intensity method are more similar to those of theoretical calculation than those by the sound pressure method. In addition, sound intensity method is much less influenced by sound field condition or continuous background noise than the sound pressure method.