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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 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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Robust Search Method for Ship Wake Using Two Wake Sensors
Lee, Young-Hyun ; Ku, Bon-Hwa ; Chung, Suk-Moon ; Hong, Woo-Young ; Ko, Han-Seok ;
The Journal of the Acoustical Society of Korea, volume 29, issue 3, 2010, Pages 155~164
This paper proposes a robust detection method for ship wake search using two wake sensors. A long trailing wake in the rear of a surface ship is generated along the track of surface ships. In this paper, we assume that the nearer the surface ship, the stronger wake strength is and a two-sensor based wake homing torpedo can sense for the wake strength. On this assumption we propose a simple wake detection and search method using information of wake strength. Experimental results using monte-carlo simulation demonstrate that the proposed method yields better performance in search time than previous method, which uses a single sensor. Our method is shown faster by about 45 seconds than previous method to achieve the same performance. Also, it can improve the detection performance of torpedo in the case of short wake length.
The Characteristics of Phase Variation by Depth of Water Column and the Correlation between Channels of Vertical Array Receiver at East Sea
Choi, Dong-Hyun ; Kim, Hyeon-Su ; Kim, Nam-Ri ; Kim, Seong-Il ; Chung, Jae-Hak ;
The Journal of the Acoustical Society of Korea, volume 29, issue 3, 2010, Pages 165~172
It is important to determine the communicational method that knows the characteristic of phase variation along transducers formed array within the water column in actual underwater environment and the correlation between transducers. This paper analyzes the characteristic of phase variation that vary on different locations by probe signals that transmitted from a probe source and received along transducers. This paper calculated the theoretical transmission capacities by the analyzation of the correlation between transducers through changing the distance between transducers and the distance between a probe source and transducers.
Acoustic Transmission Characteristics of the Cylindrical Cavity with an Auxiliary Cavity and a Gap
Jeong, Won-Tae ; Kang, Yeon-June ; Kim, Seock-Hyun ;
The Journal of the Acoustical Society of Korea, volume 29, issue 3, 2010, Pages 173~183
In this paper, acoustic transmission characteristics are theoretically considered on a cylindrical cavity system. The cylindrical cavity system is a simplified model of the acoustic cavity of King Seongdeok Divine Bell and it consists of a main cavity, a gap and an auxiliary cavity, Under a point sound source in the main cavity, acoustic frequency response property is determined and acoustic modes are analysed. The results are compared with those by the boundary element analysis using SYSNOISE. Using the proposed theoretical method, the effect of the auxiliary cavity and the gap on the resonance frequency and sound transmission characteristics is identified. Finally the best combination of the auxiliary cavity and gap is determined for the maximum transmission of the source frequency.
A Study on a Hearing Test to Measure Progress of Noise Induced Hearing Loss
Kwon, Hyung-Jun ; Lee, Sung-Tae ; Bae, Myung-Jin ;
The Journal of the Acoustical Society of Korea, volume 29, issue 3, 2010, Pages 184~190
Lowering of auditory caused by noise is increased, these days. Especially, people who have noise induced hearing loss by permanent exposure to noise are increased according to spread out of multimedia and improvement of information equipment. The pure tone audiometry used in the hospital presently inspect auditory manually up to 8,000 Hz bandwidth. So the case of noise induced hearing loss which suffered from extended high frequency over 8,000 Hz, there is a problem to prevent hearing loss by precognition. In this paper, we proposed a method to prevent noise induced hearing loss by using extended high frequency bandwidth from 12,000 Hz to 20,000 Hz. We have got a experimental result to fifty of twenties who are often used to earphones through portable equipment. As a result, 36% of twenties show lowering of auditory caused by noise and 2% of them shows severe loss of hearing.
Implementation of Parallel Processor for Sound Synthesis of Guitar
Choi, Ji-Won ; Kim, Yong-Min ; Cho, Sang-Jin ; Kim, Jong-Myon ; Chong, Ui-Pil ;
The Journal of the Acoustical Society of Korea, volume 29, issue 3, 2010, Pages 191~199
Physical modeling is a synthesis method of high quality sound which is similar to real sound for musical instruments. However, since physical modeling requires a lot of parameters to synthesize sound of a musical instrument, it prevents real-time processing for the musical instrument which supports a large number of sounds simultaneously. To solve this problem, this paper proposes a single instruction multiple data (SIMD) parallel processor that supports real-time processing of sound synthesis of guitar, a representative plucked string musical instrument. To control six strings of guitar, we used a SIMD parallel processor which consists of six processing elements (PEs). Each PE supports modeling of the corresponding string. The proposed SIMD processor can generate synthesized sounds of six strings simultaneously when a parallel synthesis algorithm receives excitation signals and parameters of each string as an input. Experimental results using a sampling rate 44.1 kHz and 16 bits quantization indicate that synthesis sounds using the proposed parallel processor were very similar to original sound. In addition, the proposed parallel processor outperforms commercial TI's TMS320C6416 in terms of execution time (8.9x better) and energy efficiency (39.8x better).
Non-Stationary/Mixed Noise Estimation Algorithm Based on Minimum Statistics and Codebook Driven Short-Term Predictor Parameter Estimation
Lee, Myeong-Seok ; Noh, Myung-Hoon ; Park, Sung-Joo ; Lee, Seok-Pil ; Kim, Moo-Young ;
The Journal of the Acoustical Society of Korea, volume 29, issue 3, 2010, Pages 200~208
In this work, the minimum statistics (MS) algorithm is combined with the codebook driven short-term predictor parameter estimation (CDSTP) to design a speech enhancement algorithm that is robust against various background noise environments. The MS algorithm functions well for the stationary noise but relatively not for the non-stationary noise. The CDSTP works efficiently for the non-stationary noise, but not for the noise that was not considered in the training stage. Thus, we propose to combine CDSTP and MS. Compared with the single use of MS and CDSTP, the proposed method produces better perceptual evaluation of speech quality (PESQ) score, and especially works excellent for the mixed background noise between stationary and non-stationary noises.
A Study on Speech Synthesizer Using Distributed System
Kim, Jin-Woo ; Min, So-Yeon ; Na, Deok-Su ; Bae, Myung-Jin ;
The Journal of the Acoustical Society of Korea, volume 29, issue 3, 2010, Pages 209~215
Recently portable terminal is received attention by wireless networks and mass capacity ROM. In this result, TTS(Text to Speech) system is inserted to portable terminal. Nevertheless high quality synthesis is difficult in portable terminal, users need high quality synthesis. In this paper, we proposed Distributed TTS (DTTS) that was composed of server and terminal. The DTTS on corpus based speech synthesis can be high quality synthesis. Synthesis system in server that generate optimized speech concatenation information after database search and transmit terminal. Synthesis system in terminal make high quality speech synthesis as low computation using transmitted speech concatenation information from server. The proposed method that can be reducing complexity, smaller power consumption and efficient maintenance.
Speaker Verification Using SVM Kernel with GMM-Supervector Based on the Mahalanobis Distance
Kim, Hyoung-Gook ; Shin, Dong ;
The Journal of the Acoustical Society of Korea, volume 29, issue 3, 2010, Pages 216~221
In this paper, we propose speaker verification method using Support Vector Machine (SVM) kernel with Gaussian Mixture Model (GMM)-supervector based on the Mahalanobis distance. The proposed GMM-supervector SVM kernel method is combined GMM with SVM. The GMM-supervectors are generated by GMM parameters of speaker and other speaker utterances. A speaker verification threshold of GMM-supervectors is decided by SVM kernel based on Mahalanobis distance to improve speaker verification accuracy. The experimental results for text-independent speaker verification using 20 speakers demonstrates the performance of the proposed method compared to GMM, SVM, GMM-supervector SVM kernel based on Kullback-Leibler (KL) divergence, and GMM-supervector SVM kernel based on Bhattacharyya distance.