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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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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 25, Issue 8 - Nov 2006
Volume 25, Issue 7 - Oct 2006
Volume 25, Issue 6 - Aug 2006
Volume 25, Issue 5 - Jul 2006
Volume 25, Issue 2E - Jun 2006
Volume 25, Issue 4 - May 2006
Volume 25, Issue 3 - Apr 2006
Volume 25, Issue 2 - Feb 2006
Volume 25, Issue 1 - Jan 2006
Selecting the target year
Audio Fingerprint Extraction Method Using Multi-Level Quantization Scheme
Song Won-Sik ; Park Man-Soo ; Kim Hoi-Rin ;
The Journal of the Acoustical Society of Korea, volume 25, issue 4, 2006, Pages 151~158
In this paper, we proposed a new audio fingerprint extraction method, based on Philips' music retrieval algorithm, which uses the energy difference of neighboring filter-bank and probabilistic characteristics of music. Since Philips method uses too many filter-banks in limited frequency band, it may cause audio fingerprints to be highly sensitive to additive noises and to have too high correlation between neighboring bands. The proposed method improves robustness to noises by reducing the number of filter-banks while it maintains the discriminative power by representing the energy difference of bands with 2 bits where the quantization levels are determined by probabilistic characteristics. The correlation which exists among 4 different levels in 2 bits is not only utilized in similarity measurement. but also in efficient reduction of searching area. Experiments show that the proposed method is not only more robust to various environmental noises (street, department, car, office, and restaurant), but also takes less time for database search than Philips in the case where music is highly degraded.
A Data-Driven Jacobian Adaptation Method for the Noisy Speech Recognition
Chung Young-Joo ;
The Journal of the Acoustical Society of Korea, volume 25, issue 4, 2006, Pages 159~163
In this paper a data-driven method to improve the performance of the Jacobian adaptation (JA) for the noisy speech recognition is proposed. In stead of constructing the reference HMM by using the model composition method like the parallel model combination (PMC), we propose to train the reference HMM directly with the noisy speech. This was motivated from the idea that the directly trained reference HMM will model the acoustical variations due to the noise better than the composite HMM. For the estimation of the Jacobian matrices, the Baum-Welch algorithm is employed during the training. The recognition experiments have been done to show the improved performance of the proposed method over the Jacobian adaptation as well as other model compensation methods.
New Design and Application of PVDF Ultrasonic Transducer for Measurement of Material Properties
Hong Soung-Wook ; Kim Jung-Soon ; Kim Sang-Yoon ; Kim Moo-Joon ; Ha Kang-Lyeol ;
The Journal of the Acoustical Society of Korea, volume 25, issue 4, 2006, Pages 164~171
If the velocities of longitudinal, transverse and leaky surface acoustic waves in an isotropic material are given, the elastic constants and density of the material can be deduced analytically. Those velocities have been measured using three ultrasonic transducers with different vibrational modes so far. In this paper a line-focusing PVDF transducer with divided electrodes was newly proposed and designed for measuring approximate velocities of the three waves. The measurement method established in this study for each waves using the transducer was applied to several isotropic materials including fused quartz. The elastic stiffness constants and densities of the materials were calculated using the measured velocities, and the accuracies were discussed. It was shown that the obtained results are in good accord with the reference values.
Effectiveness Analysis on the Coherence and Time for Synthetic Aperture Sonar
Kang Hyun-Woo ;
The Journal of the Acoustical Society of Korea, volume 25, issue 4, 2006, Pages 172~177
Various research and development on Synthetic Aperture Sonar technique is under way to enhance bearing resolution of a SONAR system. In this paper, we estimated perturbed array shapes, and compensated distortion by using estimated away shapes and synthesized arrays in aperture domain such as an ETAM technique. As experimental data, we used the one obtained from towed array in neighboring waters of the Korean peninsula. Through simulation on data where tow-ship speed is maintained at a constant level, we confirmed that synthesis effect of increasing SNR and narrowed beam width of main lobe was consistently demonstrated for about 1 minute when coherence of target signal was maintained. Also, we showed that the synthesis effect with respect to time was constantly maintained.
Development of a Portable Hydrophone Array System
Kim Bong-Chae ;
The Journal of the Acoustical Society of Korea, volume 25, issue 4, 2006, Pages 178~183
A hydrophone away is used to measure spatial distribution in underwater sound field and to detect incoming direction of sound waves in the ocean. It is not usually convenient to handle the hydrophone away because of its extensive scale. And it is not easy to purchase the hydrophone away because of expensive price. A hydrophone logger combined with a hydrophone and data logger was developed to consist conveniently of a hydrophone away for use to receive underwater sound waves. And a hydrophone array system with the hydrophone loggers was developed. Main configurations of the hydrophone 1o99er and the hydrophone array system are introduced in this paper. Also we present some measurement results by the hydrophone logger in a water tank and measurement examples on ambient noise in the sea by the hydrophone away system. And we discuss some advantages in use of the hydrophone array system.
3-D Near Field Localization Using Linear Sensor Array in Multipath Environment with Inhomogeneous Sound Speed
Lee Su-Hyoung ; Choi Byung-Woong ;
The Journal of the Acoustical Society of Korea, volume 25, issue 4, 2006, Pages 184~190
Recently, Lee et al. have proposed an algorithm utilizing the signals from different paths by using bottom mounted simple linear array to estimate 3-D location of oceanic target. But this algorithm assumes that sound velocity is constant along depth of sea. Consequently, serious performance loss is appeared in real oceanic environment that sound speed is changed variously. In this paper, we present a 3-D near field localization algorithm for inhomogeneous sound speed. The proposed algorithm adopt localization function that utilize ray propagation model for multipath environment with linear sound speed profile(SSP), after that, the proposed algorithm searches for the instantaneous azimuth angle, range and depth from the localization cost function. Several simulations using linear SSP and non linear SSP similar to that of real oceans are used to demonstrate the performance of the proposed algorithm. The estimation error in range and depth is decreased by 100m and 50m respectively.
A Study on the Relationship Between Apparent Auditory Room Size and Acoustic Preference
Jeong Dae-Up ;
The Journal of the Acoustical Society of Korea, volume 25, issue 4, 2006, Pages 191~196
Human tend to rely their information about the size of a space on vision. However, it might be a common experience to perceive a certain difference in spaces without any visual difference, in such spaces as rooms for music performance, multimedia environments with multiple sound sources, and car cabins, where auditory experiences have a certain importance. In the present work, apparent auditory room size was measured at different positions in a room through a series of listening experiments. Also, measurement of room acoustic parameters was carried out and their relationships with perceived auditory room size were analyzed. The results suggest that apparent auditory room sizes were largely dependent on musical clarity, distance between a source and a receiver, and sound pressure level at the listening position. Also, the results from acoustic preference test suggest that smaller apparent room sizes were preferred for listening to orchestral, cello and flute music. The relationship between apparent auditory room size and vocal music was found to be statistically insignificant.