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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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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 35, Issue 4 - Jul 2016
Volume 35, Issue 3 - May 2016
Volume 35, Issue 2 - Mar 2016
Volume 35, Issue 1 - Jan 2016
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Underwater acoustic communication system using diversity based on ray modeled underwater acoustic channel in Yellow Sea
Kang, Jiwoong ; Kim, Hyeonsu ; Ahn, Jongmin ; Chung, Jaehak ;
The Journal of the Acoustical Society of Korea, volume 35, issue 1, 2016, Pages 1~7
DOI : 10.7776/ASK.2016.35.1.001
This paper proposes an adequate UWA (Underwater Acoustic) communication system of underwater communication network in the Yellow Sea. UWA channel is obtained from Bellhop ray tracing method with Yellow Sea environments. Based on this channel, communication parameters for CDMA (Code Division Multiple Access) and SC-FDM (Single Carrier-Frequency Division Multiplexing) using diversity techniques are calculated. In order to prove the proposed methods, BER (Bit Error Rate) and data rate are obtained using computer simulations and the adequate communication system for long rms delay spread and low Eb/No environments is proposed from the simulation.
Estimation of target distance based on fractional Fourier transform analysis of active sonar linear frequency modulation signals
Hyung, Sungwoong ; Park, Myungho ; Hwang, Soobok ; Bae, Keunsung ;
The Journal of the Acoustical Society of Korea, volume 35, issue 1, 2016, Pages 8~15
DOI : 10.7776/ASK.2016.35.1.008
As a generalized form of the conventional Fourier transform, fractional Fourier transform (FrFT) can analyze a signal at intermediate domain between time and frequency domains with a transform order
. Especially, FrFT has a number of advantages in the analysis of LFM (Linear Frequency Modulation) signals due to its robustness to noise. In this paper, we have proposed a new method to detect and estimate the distance of the target from the FrFT spectrum of the received echo signal. Experimental results have validated the proposed method, and shown that reliable target distance could be estimated in noise and reverberation environments.
Calculation of the eigenfrequencies for an infinite circular cylinder
Baik, Kyungmin ; Ryue, Jung-Soo ; Shin, Ku-Kyun ;
The Journal of the Acoustical Society of Korea, volume 35, issue 1, 2016, Pages 16~23
DOI : 10.7776/ASK.2016.35.1.016
Present study shows three different methods finding the eigenfrequencies of an infinite circular cylinder under free-vibration; Elasticity theory that can be applied to general case, thin-shell theory that can be effectively applied to the cylinders with small thickness, and numerical study using Finite Element Method (FEM). The results obtained from those methods were verified through the cross check among the calculations. Changing the thickness of the cylinder for a fixed outer radius, all the eigenfrequencies below 1 kHz were found and their dependences on the modal index and the thickness were observed.
A survey and development of a questionnaire related to assess habits of using personal device, knowledge of hearing loss and attitude of hearing protection in adolescents
Lee, Jang soo ; Bahng, Junghwa ;
The Journal of the Acoustical Society of Korea, volume 35, issue 1, 2016, Pages 24~34
DOI : 10.7776/ASK.2016.35.1.024
The popularity of personal listening devices(PLDs) has increased over past years, especially, in adolescents. Overuses and missuses of PLDs could be the cause of noise-induced hearing loss (NIHL). The purposes of this study were (1) to survey middle school students' habits using PLDs, knowledge of hearing loss and attitude of hearing protection and (2) to develope a questionnaire for assessment of habits using PLDs, knowledge of hearing loss and attitude of hearing protection in adolescents. The 41-item questionnaire was designed and used to survey middle school students' habits using PLDs, knowledge of hearing loss and attitude of hearing protection. A total of 404 middle school students aged 14-15 years participated in the survey. Most of the students were found to use PLDs soundly. However, 30 % of students used PLDs for more than 3 hours a day. Also, almost all of the students did not understand knowledge of the causes of hearing loss, but showed interests in hearing protection. However, some students had insufficient understanding of the causes of hearing loss and the needs of hearing protection. The results suggest that the development of programs for adolescents' hearing health is needed.
Simple closed-form solution for a single source estimation in mixed far-field and near-field conditions
Jung, Tae-Jin ; Lee, KyunKyung ;
The Journal of the Acoustical Society of Korea, volume 35, issue 1, 2016, Pages 35~41
DOI : 10.7776/ASK.2016.35.1.035
Based on correlation and least square method, a closed-form algorithm for estimating the location of mixed far-field and near-field source is presented using the Uniform Circular Array (UCA). Recently, for a homogeneous circular arrangement case, a correlation based closed-form algorithm is proposed to estimate 2-D angle (azimuth, elevation) and the extended algorithm is proposed to 3-D location (azimuth, elevation, range). These algorithms assume the far-field source or near-field source only. Therefore, for mixed source localization, the proposed algorithm estimates source location with the assumption of far-field source, and then estimates the range to distinguish the far-field from the near-field source. For both cases, numerical experiments have been performed, which confirmed the validity of the proposed algorithm.
Acoustic scene classification using recurrence quantification analysis
Park, Sangwook ; Choi, Woohyun ; Ko, Hanseok ;
The Journal of the Acoustical Society of Korea, volume 35, issue 1, 2016, Pages 42~48
DOI : 10.7776/ASK.2016.35.1.042
Since a variety of sound occur in same place and similar sound occurs in other places, the performance of acoustic scene classification is not guaranteed in case of insufficient training data. A Bag of Words (BOW) based histogram feature is foreseen as a method to overcome the problem. However, since the histogram features is made by using a feature distribution, the ordering of sequence of features is ignored. A temporal information such as periodicity and stationarity are also important for acoustic scene classification. In this paper, temporal features about a periodicity and a stationarity are extracted by using a recurrent quantification analysis. In the experiment, performance of the proposed method is shown better than other baseline methods.
Vocal separation method using weighted β-order minimum mean square error estimation based on kernel back-fitting
Cho, Hye-Seung ; Kim, Hyoung-Gook ;
The Journal of the Acoustical Society of Korea, volume 35, issue 1, 2016, Pages 49~54
DOI : 10.7776/ASK.2016.35.1.049
In this paper, we propose a vocal separation method using weighted
-order minimum mean wquare error estimation (WbE) based on kernel back-fitting algorithm. In spoken speech enhancement, it is well-known that the WbE outperforms the existing Bayesian estimators such as the minimum mean square error (MMSE) of the short-time spectral amplitude (STSA) and the MMSE of the logarithm of the STSA (LSA), in terms of both objective and subjective measures. In the proposed method, WbE is applied to a basic iterative kernel back-fitting algorithm for improving the vocal separation performance from monaural music signal. The experimental results show that the proposed method achieves better separation performance than other existing methods.
An algebraic step size least mean fourth algorithm for acoustic communication channel estimation
Lim, Jun-Seok ;
The Journal of the Acoustical Society of Korea, volume 35, issue 1, 2016, Pages 55~62
DOI : 10.7776/ASK.2016.35.1.055
The least-mean fourth (LMF) algorithm is well known for its fast convergence and low steady-state error especially in non-Gaussian noise environments. Recently, there has been increasing interest in the least mean square (LMS) algorithms with variable step size. It is because the variable step-size LMS algorithms have shown to outperform the conventional fixed step-size LMS in the various situations. In this paper, a variable step-size LMF algorithm is proposed, which adopts an algebraic optimal step size as a variable step size. It is expected that the proposed algorithm also outperforms the conventional fixed step-size LMF. The superiority of the proposed algorithm is confirmed by the simulations in the time invariant and time variant channels.
Correlation of acoustic features and electrophysiological outcomes of stimuli at the level of auditory brainstem
Chun, Hyungi ; Han, Woojae ;
The Journal of the Acoustical Society of Korea, volume 35, issue 1, 2016, Pages 63~73
DOI : 10.7776/ASK.2016.35.1.063
It is widely acknowledged that the human auditory system is organized tonotopically and people generally listen to sounds as a function of frequency distribution through the auditory system. However, it is still unclear how acoustic features of speech sounds are indicated to the human brain in terms of speech perception. Thus, the purpose of this study is to investigate whether two sounds with similar high-frequency characteristics in the acoustic analysis show similar results at the level of auditory brainstem. Thirty three young adults with normal hearing participated in the study. As stimuli, two Korean monosyllables (i.e., /ja/ and /cha/) and four frequencies of toneburst (i.e., 500, 1000, 2000, and 4000 Hz) were used to elicit the auditory brainstem response (ABR). Measures of monosyllable and toneburst were highly replicable and the wave V of waveform was detectable in all subjects. In the results of Pearson correlation analysis, the /ja/ syllable had a high correlation with 4000 Hz of toneburst which means that its acoustic characteristics (i.e., 3671~5384 Hz) showed the same results in the brainstem. However, the /cha/ syllable had a high correlation with 1000 and 2000 Hz of toneburst although it has acoustical distribution of 3362~5412 Hz. We concluded that there was disagreement between acoustic features and physiology outcomes at the auditory brainstem level. This finding suggests that an acoustical-perceptual mapping study is needed to scrutinize human speech perception.
Automatic speech recognition using acoustic doppler signal
Lee, Ki-Seung ;
The Journal of the Acoustical Society of Korea, volume 35, issue 1, 2016, Pages 74~82
DOI : 10.7776/ASK.2016.35.1.074
In this paper, a new automatic speech recognition (ASR) was proposed where ultrasonic doppler signals were used, instead of conventional speech signals. The proposed method has the advantages over the conventional speech/non-speech-based ASR including robustness against acoustic noises and user comfortability associated with usage of the non-contact sensor. In the method proposed herein, 40 kHz ultrasonic signal was radiated toward to the mouth and the reflected ultrasonic signals were then received. Frequency shift caused by the doppler effects was used to implement ASR. The proposed method employed multi-channel ultrasonic signals acquired from the various locations, which is different from the previous method where single channel ultrasonic signal was employed. The PCA(Principal Component Analysis) coefficients were used as the features of ASR in which hidden markov model (HMM) with left-right model was adopted. To verify the feasibility of the proposed ASR, the speech recognition experiment was carried out the 60 Korean isolated words obtained from the six speakers. Moreover, the experiment results showed that the overall word recognition rates were comparable with the conventional speech-based ASR methods and the performance of the proposed method was superior to the conventional signal channel ASR method. Especially, the average recognition rate of 90 % was maintained under the noise environments.