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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
The Journal of the Acoustical Society of Korea
Journal Basic Information
Journal DOI :
The Acoustical Society of Korea
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Volume & Issues
Volume 29, Issue 8 - Nov 2010
Volume 29, Issue 7 - Oct 2010
Volume 29, Issue 6 - Aug 2010
Volume 29, Issue 5 - Jul 2010
Volume 29, Issue 4 - May 2010
Volume 29, Issue 3 - Apr 2010
Volume 29, Issue 2 - Feb 2010
Volume 29, Issue 1 - Jan 2010
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High-Frequency Bottom Loss Measured at Near-Normal Incidence Grazing Angle in Jinhae Bay
La, Hyoung-Sul ; Park, Chi-Hyung ; Cho, Sung-Ho ; Choi, Jee-Woong ; Na, Jung-Yul ; Yoon, Kwan-Seob ; Park, Kyung-ju ; Park, Joung-Soo ;
The Journal of the Acoustical Society of Korea, volume 29, issue 4, 2010, Pages 223~228
High-frequency bottom loss measurements for grazing angle of
in frequency range 17-40 kHz were made in Jinhae bay in the southern part of Korea. Observations of bottom loss showed the strong variation as a function of frequency, which were compared to the predicted values using two-layered sediment reflection model. The geoacoustic parameters including sound speed, density and attenuation coefficient for the second sediment layer were predicted from the empirical relations with the mean grain size obtained from sediment core analysis. The geoacoustic parameters for the surficial sediment layer were inverted using Monte Carlo inversion algorithm. A sensitivity study for the geoacoustic parameters showed that the thickness of surficial sediment layer was most sensitive to the variation of the bottom loss.
The Experimental Verification of Adaptive Equalizers with Phase Estimator in the East Sea
Kim, Hyeon-Su ; Choi, Dong-Hyun ; Seo, Jong-Pil ; Chung, Jae-Hak ; Kim, Seong-Il ;
The Journal of the Acoustical Society of Korea, volume 29, issue 4, 2010, Pages 229~236
Phase coherent modulation techniques in underwater acoustic channel can improve bandwidth efficiency and data reliability, but they are made difficult by time-varying intersymbol interference. This paper proposes an adaptive equalizer combined with phase estimator which compensates distortions caused by time-varying multipath and phase variation. The experiment in the East sea demonstrates phase coherent signals are distorted by time-varying multipath propagation and the proposed scheme equalizes them. Bit error rate of BPSK and QPSK are 0.0078 and 0.0376 at 300 meter horizontal distance and 0.0146 and 0.0293 at 1000 meter respectively.
On the Analysis of ACQ Effect in Serious Game Contents by Listening Type
Min, Yong-Sik ; Yoo, Hunter ;
The Journal of the Acoustical Society of Korea, volume 29, issue 4, 2010, Pages 237~242
To do an experimental analysis in this paper, we divided two non-equivalent control groups, such as pre and post test groups for difference listening types by serious game contents. From these test groups, we can achieve the most ability of its activity quotient (ACQ) effect is a phonic type and the next one is an aural type. The purpose of this paper is focused on the quantitative analysis of the human's brain quotient (BQ) derived from serious educational game contents.
Spectral Modeling of Haegeum Using Cepstral Analysis
Hong, Yeon-Woo ; Kang, Myeong-Su ; Cho, Sang-Jin ; Kim, Jong-Myon ; Lee, Jung-Chul ; Chong, Ui-Pil ;
The Journal of the Acoustical Society of Korea, volume 29, issue 4, 2010, Pages 243~250
This paper proposes a spectral modeling of Korean traditional instrument, Haegeum, using cepstral analysis to naturally describe Haegeum sounds varying with time. To get a precise result of cepstral analysis, we set the frame size to 3 periods of input signal and more cepstral coefficients are used to extract formants. The performance is enhanced by flexibly controlling the cutoff frequency of bandpass filter depending on the resonances in the synthesis process of sinusoidal components and the deleting peaks remained in the residual signal. To detect the change of pitch, we divide the input frames into silence, attack, and sustain region and determine which region the current frame is involved in. Then, the proposed method readjusts the frame size according to the fundamental frequency in the case of the current frame is in attack region and corrects the extraction errors of the fundamental frequency for the frames in sustain region. With these processes, the synthesized sounds are much more similar to the originals. The evaluation result through the listening test by a Haegeum player says that the synthesized sounds are almost similar to originals (96~100 % similar to the original sounds).
Study of Attenuation and Dispersion of Ultrasound in Bubbly Liquids
Choi, Young-Soo ; Ohm, Won-Suk ;
The Journal of the Acoustical Society of Korea, volume 29, issue 4, 2010, Pages 251~257
This paper deals with the attenuation and dispersion of ultrasound in bubbly liquids. Bubble clouds in liquid are formed by a variety of mechanisms, leading to different bubble sizes and spectra. Our aim is to investigate how bubble sizes and spectra affect the attenuation and dispersion characteristics of bubbly liquids. Especially, we highlight the attenuation and dispersion behaviors of nano-bubbles, which have not been reported elsewhere. Computations show that the attenuation and dispersion characteristics of bubbly liquids depend heavily on the quality factors of constituent bubbles. The present study is expected to facilitate in-depth understanding of sound propagation in bubbly liquids.
Analysis of Objective Sound Quality Features for Vacuum Cleaner Noise
Lee, Sang-Wook ; Cho, Youn ; Park, Jong-Geun ; Hwang, Dae-Sun ; Song, Chi-Mun ; Lee, Chul-Hee ;
The Journal of the Acoustical Society of Korea, volume 29, issue 4, 2010, Pages 258~264
In this paper, we propose an objective quality feature which is based on the human auditory system to measure vacuum cleaner noise. It is observed that some frequency bands are more sensitive to the human auditory system. Therefore, we divided the audible frequency range of vacuum cleaner noise into a number of frequency bands and the average energy of these bands was calculated. Among a number of average energies, an average energy of a frequency band was selected as the proposed feature. In order to test the performance of the proposed feature, fourteen vacuum cleaners were chosen and the noise was recorded in an anechoic-chamber. Then we performed subjective tests to obtain subjective scores of the noise data using the PCM (paired comparison method) and ACR (absolute category rating) subjective methods. The proposed objective quality feature shows high correlation with the subjective scores.
Study on the Performance of Spectral Contrast MFCC for Musical Genre Classification
Seo, Jin-Soo ;
The Journal of the Acoustical Society of Korea, volume 29, issue 4, 2010, Pages 265~269
This paper proposes a novel spectral audio feature, spectral contrast MFCC (SCMFCC), and studies its performance on the musical genre classification. For a successful musical genre classifier, extracting features that allow direct access to the relevant genre-specific information is crucial. In this regard, the features based on the spectral contrast, which represents the relative distribution of the harmonic and non-harmonic components, have received increased attention. The proposed SCMFCC feature utilizes the spectral contrst on the mel-frequency cepstrum and thus conforms the conventional MFCC in a way more relevant for musical genre classification. By performing classification test on the widely used music DB, we compare the performance of the proposed feature with that of the previous ones.
Performance Improvement of Speech Enhancement Using Independent Component Analysis and Perceptual Filtering
Koo, Kyo-Sik ; Cha, Hyung-Tai ;
The Journal of the Acoustical Society of Korea, volume 29, issue 4, 2010, Pages 270~277
In this paper, we proposed an algorithm that improves tone quality of noisy audio signals by using ICA(Independent Component Analysis) algorithm and perceptual filters. Many algorithms have been proposed to eliminate the noise from the audio signals, such as spectral subtraction method, perceptual filter, etc. The perceptual filter uses a noise that is acquired from silent ranges in the input signal. In this case, the improvement rate of tone quality decreases if the noise energy is changed by the environmental variation in a signal frame. But the proposed method estimates a noise that is changed at each frame using ICA algorithm. The estimated noise is applied to perceptual filter. To show the performance of the proposed algorithm, several tests are performed to various input signals. With the proposed algorithm, we could confirm the enhancement of tone quality in terms of segmental SNR (SSNR), noise-to-mask ratio (NMR) and Degradation Category Rating (DCR) test.
Cepstral Distance and Log-Energy Based Silence Feature Normalization for Robust Speech Recognition
Shen, Guang-Hu ; Chung, Hyun-Yeol ;
The Journal of the Acoustical Society of Korea, volume 29, issue 4, 2010, Pages 278~285
The difference between training and test environments is one of the major performance degradation factors in noisy speech recognition and many silence feature normalization methods were proposed to solve this inconsistency. Conventional silence feature normalization method represents higher classification performance in higher SNR, but it has a problem of performance degradation in low SNR due to the low accuracy of speech/silence classification. On the other hand, cepstral distance represents well the characteristic distribution of speech/silence (or noise) in low SNR. In this paper, we propose a Cepstral distance and Log-energy based Silence Feature Normalization (CLSFN) method which uses both log-energy and cepstral euclidean distance to classify speech/silence for better performance. Because the proposed method reflects both the merit of log energy being less affected with noise in high SNR and the merit of cepstral distance having high discrimination accuracy for speech/silence classification in low SNR, the classification accuracy will be considered to be improved. The experimental results showed that our proposed CLSFN presented the improved recognition performances comparing with the conventional SFN-I/II and CSFN methods in all kinds of noisy environments.
Soft-Decision Based Quantization of the Multimedia Signal Considering the Outliers in Rate-Allocation and Distortion
Lim, Jong-Wook ; Noh, Myung-Hoon ; Kim, Moo-Young ;
The Journal of the Acoustical Society of Korea, volume 29, issue 4, 2010, Pages 286~293
There are two major conventional quantization algorithms: resolution-constrained quantization (RCQ) and entropy-constrained quantization (ECQ). Although RCQ works well for fixed transmission-rate, it produces the distortion outliers since the cell sizes are different. Compared with RCQ, ECQ has the constraints on the cell size but it produces the rate outliers. We propose the cell-size constrained vector quantization (CCVQ) that improves the generalized Lloyd algorithm (GLA). The CCVQ algorithm is able to make a soft-decision between RCQ and ECQ by using the flexible penalty measure according to the cell size. Although the proposed method increases the small amount of overall mean-distortion, it can reduce the distortion outliers.