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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
Editor in Chief :
Volume & Issues
Volume 11, Issue 6 - Dec 1992
Volume 11, Issue 4 - Aug 1992
Volume 11, Issue 3 - Jun 1992
Volume 11, Issue 2 - Apr 1992
Volume 11, Issue 1 - Feb 1992
Volume 11, Issue 1E - 00 1992
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Simple Signal Reconstruction by Faster Adaptive MRP Algorithm
Jeong, Won-Yong ; Kim, Jong-Su ; Choe, Tae-Won ; Bae, Jin-Ho ;
The Journal of the Acoustical Society of Korea, volume 11, issue 2, 1992, Pages 5~14
In the fields of astronomy, communication, X-ray crystallography, and engineering, it is a very important and useful fact that the original signal can be reconstructed from a partial information, only spectral magnitude or phase, of the signal. In this paper, we proposed a modified iterative algorithm to solve the Magnitude Retrieval Problem (MRP) for 1-D, 2-D signals. In oder to accelerate the convergence rate, the unit constant initial function which is used in the references is replaced by the exponential initial function for the modified adaptive iterative method. As a result, MRP with 1-D signal and low-pass detail image is significantly enhanced from an iterative convergence rate and a computer storage memory points of view.
On the in situ Measurement Method of Headphones using Head And Torso Simulator
Kang, Kyeong-Ok ; Kang, Seong-Hoon ;
The Journal of the Acoustical Society of Korea, volume 11, issue 2, 1992, Pages 15~27
The standard measuring method of the frequency characteristics of headphones has been needed because different results come from the different measuring methods because of the lack of the reasonable measuring method of headphone characteristics, for example, in the case of psycho-acoustic experiments with headphones. In this paper, based on this fact, we studied the measurement method of headphones based on the natural hearing condition of human being, that is in situ measuring method, by measuring the headphone frequency characteristics using an artificial ear and a newly proposed device, HATS(Head And Torso Simulator). From the result of this paper, we could see that the method appropriate to a so called in situ condition was the one wi9th HATS, Because HATS simulated more correctly the acoustic impedance of the ear and the diffraction effect of the human head than the artificial ear.
A Study on the Acoustic Properties of Acoustic Treansducer with PZT/Metal
Kim, Jin-Soo ; Kang, Dae-Ha ; Kim, So-Jung ; Kim, Ho-Gi ; Lee, Deok-Chool ;
The Journal of the Acoustical Society of Korea, volume 11, issue 2, 1992, Pages 28~37
In the study, the Acoustic transducer of a thin circular disc-type with PZT/Metal was manufactured. The 'tape casting method' was introduced to prepare the thin disc-type of piezoelectric ceramics. The acoustic characteristics of PZT/Metal acoustic transducer for piezoelectric buzzer and piezoelectric speaker etc. have been studied and analyzed. As a result, the sound pressure level (dB), in the range from -6dB to -14dB, increased with increasing the piezoelectric coeffeicient (
) of ceramics. The optimal conditions of the sound pressure characteristics of acoustic transducer were that the radius ratio(
) of ceramics and metal plate is 0.7-0.8 and the thickness ratio(
) is 1.0, and the value were -15~-165dB.
Measurements of the floor impact sound level for floating screeds in apartment house
Park, Byeong-Jeon ; Shin, Young-Moo ;
The Journal of the Acoustical Society of Korea, volume 11, issue 2, 1992, Pages 38~49
The structure borne sound is one of the most important factor in building acoustics. Nevertheless, there is not yet sufficient knowledge to predict its behavior in preparing the acoustical design of a building. We are concerned with the concrete floating floor construction, which is one of the most promising ways to control floor impact sound. This study is to develop floating screeds isolated from the conventional concrete floor structures, to improve the concrete floor systems for the purpose of the good sound insulation performance which protects the propagation of the structure borne sound. Floor impact sound in many apartment house buildings and developed floating floors was measured, and we can save many floor impact sound data.
A Study on the Characteristics of Sound Insulation between Rooms in Apartment Houses
Lee, Sang-Woo ; Jeong, Dae-Up ; Kim, Heung-Sik ; Kim, Ha-Geun ;
The Journal of the Acoustical Society of Korea, volume 11, issue 2, 1992, Pages 50~58
To improve the quality of dwelling environment of domestic apartment house, it is required to establish the sound insulation standard and the performance evaluation method which is suitable to the domestic residential conditions. In this study, the properties of internal noisy sources of a single unit in apartment houses and the sound insulation performance of party walls are investigated and analyzed, as a primary step to the establishment of sound insulation standard. Based on these data, the differences in sound insulation index of each plane type are investigated along with their causes. Also, the factor which affect and decide the insulation performance are analyzed in an effort to improve the performance of party wall structures.
Active Noise Control in Finite Duct by the FIR Filter Modelling Considering the Stuructural Characteristics
Lee, Tae-Yeon ; Song, Won-Shik ; Oh, Jae-Eung ;
The Journal of the Acoustical Society of Korea, volume 11, issue 2, 1992, Pages 59~67
Recently, the problem which actively control the unwanted noise propagated from the technical structure by the generated secondary sound has become considerable topic from the environmental preservation point of view. In most of these studies, active noise control deals with a plane wave propagation at low frequency using adaptive filtering techniques. On the other hand, in real acoustic systems are mostly short due to the limitation of geometric configuration. In this case, the acoustic properties such as reflections and resonances inside the acoustic system should be considered. In this paper, the acoustic modeling method for short length duct was introduced using the transfer matrix method, and the active noise control problem was investigated with \implementation of FIR filter for the transfer function of control system derived from this modeling method. The identification methods for the acoustic model of actual control system was proposed by numerical computation technique based on the estimation of optimal FIR filter coefficients. The acceptable attenuation on the real acoustic system and stability of the controller are predicted in this computational simulation.
Speaker Recognition Using Optimal Path and Weighted Orthogonal Parameters
Park, Seung-Kyu ; Bai, Chul-Soo ;
The Journal of the Acoustical Society of Korea, volume 11, issue 2, 1992, Pages 68~72
Recently, many researchers have studied the speaker recognition through the statistical processing method using Karhunen-Loeve Transform. However, the content of speaker's identity and the vocalization speed cause speaker recognition rate to be lowered. This parer studies the speaker recognition method using weighted orthogonal parameters which are weighted with eigen-values of speech so as to emphasize the speaker's identity, and optimal path which is made by DWP so as to normalize dynamic time feature of speech. To confirm this method, we compare the speaker recognition rate from this proposed method with that from the conventional statistical processing method. As a result, it is shown that this method is more excellent in speaker recognition rate than conventional method.
Signal Processing for Speech Recognition in Noisy Environment
Kim, Weon-Goo ; Lim, Yong-Hoon ; Cha, Il-Whan ; Youn, Dae-Hee ;
The Journal of the Acoustical Society of Korea, volume 11, issue 2, 1992, Pages 73~84
This paper studies noise subtraction methods and distance measures for speech recognition in a noisy environment, and investigates noise robustness of the distance measures applied to the problem of isolated word recognition in white Gaussian and colored noise (vehicle noise) environments. Noise subtraction methods which can be used as a pre-processor for the speech recognition system, such as the spectral subtraction method, autocorrelation subtraction method, adaptive noise cancellation and acoustic beamforming are studied, and distance measures such and Log Likelihood Ratio (
), cepstral distance measure (
), weighted cepstral distance measure (
), spectral slope distance measure (
) and cepstral projection distance measure (
) are also investigated. Testing of the distance measures for speaker-dependent isolated word recognition in a noisy environment indicate that
which weigh higher order cepstral coefficients more heavily give considerable performance improvement over
. In addition, when no pre-emphasis is performed, the recognizer can maintain higher performance under high noise conditions.
화자 독립 음성 인식 및 화자 적응에 관한 연구
O, Gwang-Cheol ; Kim, Heung-Guk ; Kim, Hoe-Rin ; Lee, Hwang-Su ;
The Journal of the Acoustical Society of Korea, volume 11, issue 2, 1992, Pages 85~95