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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
The Journal of the Acoustical Society of Korea
Journal Basic Information
Journal DOI :
The Acoustical Society of Korea
Editor in Chief :
Volume & Issues
Volume 13, Issue 6 - Dec 1994
Volume 13, Issue 5 - Oct 1994
Volume 13, Issue 4 - Aug 1994
Volume 13, Issue 3 - Jun 1994
Volume 13, Issue 2 - Apr 1994
Volume 13, Issue 1 - Feb 1994
Volume 13, Issue 2E - 00 1994
Volume 13, Issue 1E - 00 1994
Selecting the target year
A Study on Speech Recognition by One Stage MSVQ/DP
Jeoung, Eui-Bung ;
The Journal of the Acoustical Society of Korea, volume 13, issue 2, 1994, Pages 5~12
This paper proposes One Stage MSVQ/DP method for word recognition system university administration branch names are selected for the recognition experiment and 10 LPC cepstrum coefficients is used as the feature parameter. Besides the speech recognition experiments by proposed method, for comparision with it, we perform the experiments on the same data by Level Building DTW and One Stage DP method. The Recognition rates with the LBDTW and the One Stage method are
, but the recognition rate with the proposed method is
Sound Radiation due to Tire Tread Vibration
Kim, Byoung-Sam ; Hong, Dong-Pyo ; Chung, Tae-Jin ;
The Journal of the Acoustical Society of Korea, volume 13, issue 2, 1994, Pages 13~22
A theoretical model is studied to describe the sound radiation by the surface vibration of in-service tires. The tire is modeled as a circular ring model. The effects of normalized frequency and structrual loss factor are included. Through numerical integration of the sound pressure, the radiated sound power is calculated as a fuction of normalized frequency and structural loss factor. The basic sound radiation mechanism is shown to be the damped progressive wave field on the structure in the vicinity of the applied force. The results indicate that the potential sound reduction might be obtained if values of normalized frequency and structural loss factor are investigated.
Experimental Study of the In-Water Radiation Impedance of the Finite Baffle Cylinder Radiator
Kim, Won-Ho ; Yoon, Jong-Rak ;
The Journal of the Acoustical Society of Korea, volume 13, issue 2, 1994, Pages 23~29
In this paper, the measured in-water radiation impedance of cylindrical piezoelectric radiator with finite baffle is compared to the existing theoretical result of that with infinite baffle and the effect of baffle on the radiation impedance is examined. Comparision between measurement and theoretical result of radiation impedance shows that the measured radiation impedance tends to be that of the infinite baffle as the baffle length increases. Another finding of the comparision in that the effect of baffle is more dominant in radiation reactance than in radiation resistance. Therefore, for the use of theoretical radiation impedance of infinite baffle on the design of acoustic transducer, the impedance compensation to the baffle length should conducted.
MOving Spread Target signal simulation
Seong, Nak-Jin ; Kim, Jea-Soo ; Lee, Snag-Young ; Kim, Kang ;
The Journal of the Acoustical Society of Korea, volume 13, issue 2, 1994, Pages 30~37
Since the morden targets are of high speed and getting quiet in both active and passive mode, the necessities of developing advanced SONAR system capable of performing target motion analysis (TMA) and target classification are evident. In order to develop such a system, the scattering mechanism of complex bodies needs to be, some extent, fully understood and modeled. In this paper, MOving Spread Target(MOST) signal simulation model is presented and discussed. The model is based on the highlight distribution method, and simulates pulse elongation of spread target, doppler effect due to kinematics of the target as well as SONAR platform, and distribution target strength of each highlight point (HL) with directivity. The model can be used in developing and evaluating advanced SONAR system through system simulation, and can also be used in the development of target state estimation algorithm.
A Study on the Design of Echo-Canceller using SIA(Stochastic Iteration Algorithm)
Cho, Hyon-Mook ; Kim, Sang-Hoon ; Park, Nho-Kyung ; Moon, Dai-Tchul ; Tchah, Kyun-Hyon ;
The Journal of the Acoustical Society of Korea, volume 13, issue 2, 1994, Pages 38~49
This paper proposes Echo canceller used in simultaneous two-way ('full-duplex') transmission of data signals over two-wire circuits which can be achieved by using a hybrid coupler. This Echo canceller uses sequential processing instead of parallel processing with conventional adaptive digital filter. This structure reduces the number of multipliers. Thus, this structure is much more suitable for IC implementation. This Echo canceller operates according to the 'Stochastic Iteration Algorithm(SIA).' SIA algorithm has merit of good performance and small hardware requirement.
Korean Single-Vowel Recognition Using Cumulants in Color Noisy Environment
Lee, Hyung-Gun ; Yang, Won-Young ; Cho, Yong-Soo ;
The Journal of the Acoustical Society of Korea, volume 13, issue 2, 1994, Pages 50~59
This paper presents a speech recognition method utilizing third-order cumulants as a feature vector and a neural network for recognition. The use of higher-order cumulants provides desirable uncoupling between the gaussian noise and speech, which enables us to estimate the coefficients of AR model without bias. Unlike the conventional method using second-order statistics, the proposed one exhibits low bias even in SNR as low as 0 dB at the expense of higher variance. It is confirmed through computer simulation that recognition rate of korean single-vowels with the cumulant-based method is much higher than the results with the conventional method even in low SNR.
Acoustic Characteristics Analysis of the Axi-symmetric Transducer by the combined Finite Element Method and Hybrid Type Infinite Element Method, Part I ; Radiation Impedance, Directivity and Transducer Coupling Effect
Yoon, Jong-Rak ; Yoon, Hyeong-Kyu ; Kim, Dae-Whan ; Kim, Chun-Duck ;
The Journal of the Acoustical Society of Korea, volume 13, issue 2, 1994, Pages 60~67
This is the first of two companion papers which suggests the algorithm of the combined Finite Element Method and Infinite Element Method for the analysis of the axi-symmetric acoustic transducer in the open boundary. Using the algorithm, the numerical analysis for the transducer radiation impedance, directivity, and coupling effect between transducer elements are also conducted. In the second paper, the wideband array transducer is designed and its acoustic characteristics are examined on the basis of the results of the first paper.
Acoustic Characteristics Analysis of the Axi-symmetric Transducer by the combined Finite Element Method and Hybrid Type Infinite Element Method, Part II : Wideband Array Transducer Design and its Acoustic Characteristics
Kim, Chun-Duck ; Kim, Won-Ho ; Kim, Dae-Whan ; Yoon, Jong-Rak ;
The Journal of the Acoustical Society of Korea, volume 13, issue 2, 1994, Pages 68~75
This is the second of two companion papers wich describes the wideband array transducer design procedure and the designed transducer acoustic characteristics. In addition, the result of the designed transducer acoustic characteristics by the combined Finite Element Method and Hybrid Type Infinite Element Method, is found to better than that by the equivalent circuit model method. Therefore, the technique presented in this paper could be applied in the design and the acoustic characteristics analysis of the wideband array transducer.
An Application of the Kalman Filter for Attenuation of Colored Noise Superimposed on Speech Signal
Gu, Bon-Eung ;
The Journal of the Acoustical Society of Korea, volume 13, issue 2, 1994, Pages 76~85
A speech enhancement algorithm which attenuates nonstationary colored noise is presented In this paper. The algorithm consists of a stationary Kalman filter and the simple speech/nonspeech detector. While the conventional enhancement systems are focused on a stationary and/or white background noise, this study Is focused on the mort realistic nonstationary and nonwhite noise. An AR model-based vector Kalman filter is used as a noise suppression system and a short-time energy threshold logic is used as a speech/nonspeech classifier. For Kalman filtering. noise coefficients are estimated in the nonspeech frame, and speech coefficients are estimated by applying the EM iteration algorithm. Simulation results using the car noise are presented based on the signal-to-noise ratio and informal listening tests. According to the experimental results, background noises in the nonspeech frames are eliminated almost completely, while some distortions are noticed in the speech frames. The distortion becomes severer as the SNR is reduced to 0dB and -5dB. Intelligibility, however, is not degraded significantly.
음성 인식 기술 현황 및 실용화 전망
The Journal of the Acoustical Society of Korea, volume 13, issue 2, 1994, Pages 86~95
Study Trends of Speech Recognition using Neural Networks
Lee, Gi-Yeong ; Bae, Cheol-Su ; Choe, Gap-Seok ;
The Journal of the Acoustical Society of Korea, volume 13, issue 2, 1994, Pages 96~103