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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 30, Issue 8 - Nov 2011
Volume 30, Issue 7 - Oct 2011
Volume 30, Issue 6 - Aug 2011
Volume 30, Issue 5 - Jul 2011
Volume 30, Issue 4 - May 2011
Volume 30, Issue 3 - Apr 2011
Volume 30, Issue 2 - Feb 2011
Volume 30, Issue 1 - Jan 2011
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Improvement of Medical Ultrasound Strain Image Using Lateral Motion Compensation
Park, Myung-Ki ; Kwon, Sung-Jae ; Jeong, Mok-Kun ;
The Journal of the Acoustical Society of Korea, volume 30, issue 5, 2011, Pages 239~248
DOI : 10.7776/ASK.2011.30.5.239
In order to improve the quality of strain images in medical ultrasound imaging, displacements need to be accurately estimated. In this paper, in order to apply one-dimensional displacement estimation methods to two-dimensional motion estimation, the axial and lateral displacements are separately estimated. In order to estimate lateral displacements, one-dimensional signals aligned in the lateral direction are converted to analytic signals, which are then crosscorrelated. Strain images are produced by first compensating two-dimensional displacements for lateral motion with lateral motion displacement estimates obtained from the proposed lateral displacement estimation algorithm and then estimating axial displacements. Both phantom and human data experiments show that the proposed method provides better signal-to-noise ratio and contrast-to-noise ratio characteristics than a conventional strain imaging method that utilizes axial displacement estimates only.
Inquiring Activities on the Acoustic Phenomena Using Sound Card in Personal Computer
Lee, Seung-Koog ; Lee, Jong-Rim ; Kim, Hyun-Byuk ; Kim, Young-H. ;
The Journal of the Acoustical Society of Korea, volume 30, issue 5, 2011, Pages 249~254
DOI : 10.7776/ASK.2011.30.5.249
Inquiring activities on the acoustic phenomena have been carried out by using a sound card installed in a personal computer. A sound card is cheaper and more accessible to the students than the precision equipment such as a function generator or an oscilloscope. The students record the sounds from various acoustic phenomena to the sound card. Then they analyze the frequency spectrums of that sounds by using a program. Inquired phenomena include beat by two tuning forks, sound from Rijke tube, pouring sound, breaking of a wine glass and pop-up sound of a wine bottle. Through these activities students perform quantitative analysis of various phenomena due to superposition, resonance and standing wave.
Improvement of 3D Sound Using Psychoacoustic Characteristics
Koo, Kyo-Sik ; Cha, Hyung-Tai ;
The Journal of the Acoustical Society of Korea, volume 30, issue 5, 2011, Pages 255~264
DOI : 10.7776/ASK.2011.30.5.255
The Head Related Transfer Function (HRTF) means a process related to acoustic transmission from 3d space to the listener`s ear. In other words, it contains the information that human can perceive locations of sound sources. So, we make virtual 3d sound using HRTF, despite it doesn`t actually exist. But, it can deteriorate some three-dimensional effect by the confusion between front and back directions due to the non-individual HRTF depending on each listener. In this paper, we proposed the new algorithm to reduce the confusion of sound image localization using human`s acoustic characteristics. The frequency spectrum and global masking threshold of 3d sounds using HRTF are used to calculate the psychoacoustical differences among each directions. And perceptible cues in each critical band are boosted to create effective 3d sound. As a result, we can make the improved 3d sound, and the performances are much better than conventional methods.
A Method of Adaptive ISF Split Vector Quantization Using Normalized Codebook
Piao, Zhigang ; Lim, Jong-Ha ; Hong, Gi-Bong ; Lee, In-Sung ;
The Journal of the Acoustical Society of Korea, volume 30, issue 5, 2011, Pages 265~272
DOI : 10.7776/ASK.2011.30.5.265
In most of the ISF (or LSF) based real time speech codec, SVQ (split vector quantization) method is used to decrease the quantizer complexity and memory size of codebook. However, it produces drawback that the level of correlation between code vectors can not be used during vector splits. This paper presents a new method of adaptive ISF vector quantization, which compensates the drawbacks of SVQ structured quantizer for wideband speech codec. In each different frame, the proposed method makes use of the correlation between splitted vectors by adaptively changing codebook distribution according to ordering property of ISF. The algorithm is evaluated in AMR-WB, and shows about 1.5 bit per frame improvement.
Acoustic Characteristics and Timbre Preferences of Korean Bells
Park, Sang-Ha ; Lee, Min-Gu ; Hahn, Na-Ra ; Sung, Koeng-Mo ;
The Journal of the Acoustical Society of Korea, volume 30, issue 5, 2011, Pages 273~280
DOI : 10.7776/ASK.2011.30.5.273
The sounds of the Korean temple bells, that are located in the various places, were recorded and classified into two groups according to the size of bells. The sound preference was investigated with the subjective listening test on the bells of each group. And the acoustic characteristics of the bells such as the frequency, amplitude, beat period, and 20 dB decay rate of the partials was analyzed. The correlation between the acoustic parameters and timbre preference were analyzed and the acoustic characteristics of highly preferred bell sound were presented.
Exploration of Optimal Multi-Core Processor Architecture for Physical Modeling of Plucked-String Instruments
Kang, Myeong-Su ; Choi, Ji-Won ; Kim, Yong-Min ; Kim, Jong-Myon ;
The Journal of the Acoustical Society of Korea, volume 30, issue 5, 2011, Pages 281~294
DOI : 10.7776/ASK.2011.30.5.281
Physics-based sound synthesis usually requires high computational costs and this results in a restriction of its use in real-time applications. This motivates us to implement the sound synthesis algorithm of plucked-string instruments using multi-core processor architectures and determine the optimal processing element (PE) configuration for the target instruments. To determine the optimal PE configuration, we evaluate the impacts of a sample-per-processing element (SPE) ratio that is defined as the amount of sample data directly mapped to each PE on system performance and both area and energy efficiencies using architectural and workload simulations. For the acoustic guitar, the highest area and energy efficiencies are achieved at a SPE ratio of 5,513 and 2,756, respectively, for the synthesis of musical sounds sampled at 44.1 kHz. In the case of the classical guitar, the maximum area and energy efficiencies are achieved at a SPE ratio of 22,050 and 5,513, respectively. In addition, the synthetic sounds were very similar to original sounds in their spectra. Furthermore, we conducted MUSHRA subjective listening test with ten subjects including nine graduate students and one professor from the University of Ulsan, and the evaluation of the synthetic sounds was excellent.
Development of Korean Consonant Perception Test
Kim, Jin-Sook ; Shin, Eun-Yeong ; Shin, Hyun-Wook ; Lee, Ki-Do ;
The Journal of the Acoustical Society of Korea, volume 30, issue 5, 2011, Pages 295~302
DOI : 10.7776/ASK.2011.30.5.295
The purpose of this study was to develop Korean Consonant Perception Test (KCPT), that is a phonemic level including elementary data to evaluate speech and consonant perception ability of the normal and the hearing impaired qualitatively and quantitatively. KCPT was completed with meaningful monosyllabic words out of possible all Korean monosyllabic words, considering articulation characteristics, the degree of difficulty, and the frequency of the phonemic appearance, after assembling a tentative initial and final consonants testing items using four multiple-choice method which were applied to the seven final consonant regulation and controlled with the familiarity of the target words. Conclusively, the final three hundred items were developed including two- and one-hundred items for initial and final testing items, respectively, with the evaluation of the 20 normal hearing adults. Through this process, the final KCPT was composed upon the colloquial frequency following identification of no speakers` variances statistically and elimination of the highly difficult items. The 30 hearing impaired were tested with KCPT and found that the half lists, A and B, were not different statistically and the initial and final testing items were appropriate for evaluating initial and final consonants, respectively.