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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 14, Issue 6 - Dec 1995
Volume 14, Issue 5 - Oct 1995
Volume 14, Issue 4 - Aug 1995
Volume 14, Issue 3 - Jun 1995
Volume 14, Issue 2 - Apr 1995
Volume 14, Issue 1 - Feb 1995
Volume 14, Issue 2E - 00 1995
Volume 14, Issue 1E - 00 1995
Selecting the target year
A study on the improvement of average seek time which use ref_T. E signal and sample pulse signal in optical disk drive
Lee, Si-Hyun ; Kim, Kye-Kook ; Kim, Hyung-Lea ;
The Journal of the Acoustical Society of Korea, volume 14, issue 4, 1995, Pages 5~11
In this paper, we design the new high-speed seek algorithm which can access the data of disk (in 3.5-inch optical disk drive). When seek the target track on optical disk in high-speed using the ref-T. E(Reference Tracking Error) and sample pulse signal, it's always possible high-speed seek without re-check and compensation for error by the ref_T. E and sample pulse signal. The performance test result is represented as follow ; it is satify the average seek time of 28mses.
A Study on the Detection of Defects from Parallel Cylindrical Objects Using Spectral Analysis of Acoustic Impact Signal
Bang, Ho-Gyun ; Jo, Cheol-U ;
The Journal of the Acoustical Society of Korea, volume 14, issue 4, 1995, Pages 12~20
This paper describes principles and experimental results in conjunction with examining the possibility of the detection of effects from a cylindrical objects. Cylindrical objects have its own resonance frequency. The frequency varies according to the diameter, length etc. And acoustic sound, whose frequency and the harmonic components corresponding to resonance frequency, is radiated from the object. When an object have defect in itself, the radiated acoustic sound is different from normal one. So we can detect its defect by analysing frequency components of acoustic sound. We proved that detection of defective objects by acoustic signal analysis is possible automatically. Also the result can be applied to other kinds of objects.
Intonatin Conversion using the Other Speaker's Excitation Signal
Lee, Ki-Young ; Choi, Chang-Seok ; Choi, Kap-Seok ; Lee, Hyun-Soo ;
The Journal of the Acoustical Society of Korea, volume 14, issue 4, 1995, Pages 21~28
In this paper an intonation conversion method is presented which provides the basic study on converting the original speech into the artificially intoned one. This method employs the other speaker's excitation signals as intonation information and the original vocal tract spectra, which are warped with the other speaker's ones by using DTW. as vocal features, and intonation converted speech signals are synthesized through short-time inverse Fourier transform(STIFT) of their product. To evaluate the intonation converted speech by this method, we collect Korean single vowels and sentences spoken by 30 males and compare fundamental frequency contours spectrograms, distortion measures and MOS test between the original speech and the converted one. The result shows that this method can convert and speech into the intoned one of the other speaker's.
A new transmission-line model for multi-layered PZT ultrasonic transducer
Kim, Moo-Joon ; Ha, Kang-Lyeol ; Kim, Sung-Boo ; Lee, Jong-Kyu ;
The Journal of the Acoustical Society of Korea, volume 14, issue 4, 1995, Pages 29~37
A resonant frequency of piezoelectric transducer depends remarkably on the electric impedance connected to the vibrator. In this paper, using this effect of frequency controllable two layered PZT ultrasonic transducer is designed and its acoustic characteristics are analyzed by a new transmission model equivalent circuit. The theoretical and the experimental results of the electric impedance effect on the resonant frequency variation were compared and both results showed a good consistency each other. The resonant frequency has been controlled continuously in the wide frequency range of 180kHz~580kHz and the effective attenuations were less than 7dB in the frequency range of 330kHz~470kHz.
A CELP Coder using the Band-Divided Long Term Prediction
Choi, Young-Soo ; Kang, Hong-Goo ; Lim, Myoung-Seob ; Ahn, Dong-Soon ; Youn, Dae-Hee ;
The Journal of the Acoustical Society of Korea, volume 14, issue 4, 1995, Pages 38~45
In this paper a way to improve the performance of the long term prediction is proposed, which adopts the Multi-band Excitation (MBE) method in addition to the Code-Excited Linear Prediction (CELP) method at low bit rates below 4.8 kbps. In the proposed method, the multiband long term prediction is performed on the periodic components which still remain after the long term prediction of the conventional CELP method. At this point, the whole frequency region is divided into subbands whose size is equal to the spacing between the harmonics of the fundamental frequency, and the periodic multiband excitation signals. are represented as the sum of sine waves approximately as large as the spectrum of the excitation signals, so that the actual characteristics of the excitation signals can be better taken into account. To evaluate the performance of the proposed method, computer simulation is performed at 4.8 kbps. The 4.8 kbps DoD CELP and the 4.4 kbps IMBE were chosen as the reference vocoders for the speech quality measure. The result of the perceptual speech quality measure showed that the performance of the proposed method is better than that of the 4.8 kbps DoD CELP vocoder, and similar to that of the 4.4 kbps IMBE vocoder.
A Study on the Diphone Recognition of Korean Connected Words and Eojeol Reconstruction
The Journal of the Acoustical Society of Korea, volume 14, issue 4, 1995, Pages 46~63
This thesis described an unlimited vocabulary connected speech recognition system using Time Delay Neural Network(TDNN). The recognition unit is the diphone unit which includes the transition section of two phonemes, and the number of diphone unit is 329. The recognition processing of korean connected speech is composed by three part; the feature extraction section of the input speech signal, the diphone recognition processing and post-processing. In the feature extraction section, the extraction of diphone interval in input speech signal is carried and then the feature vectors of 16th filter-bank coefficients are calculated for each frame in the diphone interval. The diphone recognition processing is comprised by the three stage hierachical structure and is carried using 30 Time Delay Neural Networks. particularly, the structure of TDNN is changed so as to increase the recognition rate. The post-processing section, mis-recognized diphone strings are corrected using the probability of phoneme transition and the probability o phoneme confusion and then the eojeols (Korean word or phrase) are formed by combining the recognized diphones.
Development of Simulator for surface acoustic wave filters
Kwon, Hee-Doo ; Yoon, Yung-Sup ; Kim, Dong-Il ; Ruy, Jae-Gu ; Ryu, Jae-Sung ;
The Journal of the Acoustical Society of Korea, volume 14, issue 4, 1995, Pages 64~73
We developed a surface acoustic wave (SAW) computer aided design (CAD) for mobile communication using Kaier window function. The systems are composed of modules for designing apodization weighted IDT-uniform IDT, withdrawal weighted IDT-withdrawal weighted IDT, and resonator type. The design of SAW bandpass with center frequencies from 222MHz to 343MHz were simulated by the developed CAD system. Although the method proposed in this paper is formulated primarily for SAW filters, it is equally applicable to finite impulse response (FIR) digital filter design.
Speech Data Collection for korean Speech Recognition
Park, Jong-Ryeal ; Kwon, Oh-Wook ; Kim, Do-Yeong ; Choi, In-Jeong ; Jeong, Ho-Young ; Un, Chong-Kwan ;
The Journal of the Acoustical Society of Korea, volume 14, issue 4, 1995, Pages 74~81
This paper describes the development of speech databases for the Korean language which were constructed at Communications Research Laboratory in KAIST. The procedure and environment to construct the speech database are presented in detail, and the phonetic and linguistic properties of the databases are presented. the databases were intended for use in designing and evaluating speech recognition algorithms. The databases consist of five different sets of speech contents : trade-related continuous speech with 3,000 words, variable-length connected digits, phoneme-balanced 75 isolated words, 500 isolated Korean provincial names, and Korean A-set words.
Self-Radiation Impedance of rectangular Acoustic Sensor Without Baffle
Lee, Jong-Kil ; Seo, In-Chang ;
The Journal of the Acoustical Society of Korea, volume 14, issue 4, 1995, Pages 82~88
Conductance and susceptance of the self-radiation impedance in a rectangular acoustic sensor without baffle are measured experimentally. Finite polyurethane window is mounted at the end of the acoustic sensor. The sensor radiation impedance is cauculated using the equivalent electric circuit. Using the Levine's integral equations of a rectangular piston mounted to the rigid infinite baffle, radiation resistance and reactance were simulated numerically. Numerical and experimental results are compared to each other.
On a Pitch Alteration Method by Time-axis Scaling Compensated with the Spectrum for High Quality Speech Synthesis
Bae, Myung-Jin ; Lee, Won-Cheol ; Im, Sung-Bin ;
The Journal of the Acoustical Society of Korea, volume 14, issue 4, 1995, Pages 89~95
The waveform coding technique has concerned with simply preserving the waveform shape of speech signal through a redundancy reduction process. In the case of speech synthesis, the waveform coding with high sound quality is mainly used to the synthesis by analysis. However, since the parameters of this coding are not classified into either excitation or vocal tract parameters, it is difficult to applying the waveform coding to the synthesis by rule. In order to apply the waveform coding to the synthesis by rule, the pitch alteration technique is required in prosody control. In this paper, we propose a new pitch alteration method that can change the pitch period in waveform coding by scaling the time-axis and compensating the spectrum. This is relevant to the time-frequency domain method were the phase components of the waveform is preserved with a little spectrum distortion of 2.5 % and less for 50% pitch change.
Robust Beamformer to Source Range Mismatch
Youn, Won-Sik ;
The Journal of the Acoustical Society of Korea, volume 14, issue 4, 1995, Pages 96~99
Under signal range mismatch, the LCMV beamformer has the performance degradation to cancel a desired signal. Using the eigenstructure properties of the array covariance matrix, we investigate the cause of this problem. From this investigation, a robust beamformer to source range mismatch is presented. The proposed beamformer has the maximum output signal-to-noise ration (SNR). When a desired signal is in a far field, the weight vector of the proposed beamformer is not biased.
Prediction Method for Road Traffic Noise
Kim, Ha-Geun ; Sohn, Jang-Yeul ; Kim, Heung-Sik ;
The Journal of the Acoustical Society of Korea, volume 14, issue 4, 1995, Pages 100~108
This study is aimed to show that revised prediction method in road traffic noise after comparing prediction method of National Institute of Environmental Research with that of the Acoustical Society of Japan. For this purpose, prediction equation and caluation procedure of each case was programmized and data predicted by each method were compared with those measured in the 14 fields. The result show that data predicted by 14 fields. The result show that data predicted by the method proposed in this study were closer to the data measured in the fields than those predicted by National Institute of Environmental Research and the Acoustical Society of Japan in the surroundings of urban express way (include highway) and general traffic road where the vehicle speed is higher than 40km/h.