Go to the main menu
Skip to content
Go to bottom
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 26, Issue 8 - Nov 2007
Volume 26, Issue 7 - Oct 2007
Volume 26, Issue 6 - Aug 2007
Volume 26, Issue 5 - Jul 2007
Volume 26, Issue 4 - May 2007
Volume 26, Issue 3 - Apr 2007
Volume 26, Issue 2 - Feb 2007
Volume 26, Issue 1 - Jan 2007
Selecting the target year
SC-FDE System Using Decision-Directed Method Over Time-Variant Fading Channels
Kim, Ji-Heon ; Yang, Jin-Mo ; Kim, Whan-Woo ;
The Journal of the Acoustical Society of Korea, volume 26, issue 6, 2007, Pages 227~234
This paper describes a transmission method based on a single carrier with frequency domain equalization (SC-FDE) scheme with cyclic prefix(CP). The SC-FDE has similar features with orthogonal frequency division multiplexing(OFDM). Similar to OFDM, a SC-FDE system is computationally efficient since equalization is reformed on a block of data in the frequency domain. Especially, it has the advantage of low sensitivity to nonlinear distortion compared to OFDM. In this paper, we design a SC-FDE receiver using decision-directed method, and present simulation results.
The Research of the Heavy-Weight Impact Sound Characteristic by Live load Installation on the Source Room
Kim, Kyoung-Woo ; Yang, Kwan-Seop ; Sohn, Jang-Yeul ;
The Journal of the Acoustical Society of Korea, volume 26, issue 6, 2007, Pages 235~242
The test and evaluation of floor impact sound is mainly conducted before move in the residence. Floor impact sound generating is actually the conditions in which a heavy load like a curtain and furniture is installed, the situation before and after move in the residence is different. In this study, we investigate the floor impact sound variations according to the live load installation like furniture in the source room. The vibration acceleration level and floor impact sound level variation were measured before and after live load (
) installation in the floor impact sound test building and the field. The difference was not large although the vibration acceleration level and the floor impact sound level were reduced through measurement result of load installation. Resonance frequency was not changed by load installation.
GMM-Based Gender Identification Employing Group Delay
Lee, Kye-Hwan ; Lim, Woo-Hyung ; Kim, Nam-Soo ; Chang, Joon-Hyuk ;
The Journal of the Acoustical Society of Korea, volume 26, issue 6, 2007, Pages 243~249
We propose an effective voice-based gender identification using group delay(GD) Generally, features for speech recognition are composed of magnitude information rather than phase information. In our approach, we address a difference between male and female for GD which is a derivative of the Fourier transform phase. Also, we propose a novel way to incorporate the features fusion scheme based on a combination of GD and magnitude information such as mel-frequency cepstral coefficients(MFCC), linear predictive coding (LPC) coefficients, reflection coefficients and formant. The experimental results indicate that GD is effective in discriminating gender and the performance is significantly improved when the proposed feature fusion technique is applied.
Robust Speech Recognition Algorithm of Voice Activated Powered Wheelchair for Severely Disabled Person
Suk, Soo-Young ; Chung, Hyun-Yeol ;
The Journal of the Acoustical Society of Korea, volume 26, issue 6, 2007, Pages 250~258
Current speech recognition technology s achieved high performance with the development of hardware devices, however it is insufficient for some applications where high reliability is required, such as voice control of powered wheelchairs for disabled persons. For the system which aims to operate powered wheelchairs safely by voice in real environment, we need to consider that non-voice commands such as user s coughing, breathing, and spark-like mechanical noise should be rejected and the wheelchair system need to recognize the speech commands affected by disability, which contains specific pronunciation speed and frequency. In this paper, we propose non-voice rejection method to perform voice/non-voice classification using both YIN based fundamental frequency(F0) extraction and reliability in preprocessing. We adopted a multi-template dictionary and acoustic modeling based speaker adaptation to cope with the pronunciation variation of inarticulately uttered speech. From the recognition tests conducted with the data collected in real environment, proposed YIN based fundamental extraction showed recall-precision rate of 95.1% better than that of 62% by cepstrum based method. Recognition test by a new system applied with multi-template dictionary and MAP adaptation also showed much higher accuracy of 99.5% than that of 78.6% by baseline system.
HMM-Based Bandwidth Extension Using Baum-Welch Re-Estimation Algorithm
Song, Geun-Bae ; Kim, Austin ;
The Journal of the Acoustical Society of Korea, volume 26, issue 6, 2007, Pages 259~268
This paper contributes to an improvement of the statistical bandwidth extension(BWE) system based on Hidden Markov Model(HMM). First, the existing HMM training method for BWE, which is suggested originally by Jax, is analyzed in comparison with the general Baum-Welch training method. Next, based on this analysis, a new HMM-based BWE method is suggested which adopts the Baum-Welch re-estimation algorithm instead of the Jax's to train HMM model. Conclusionally speaking, the Baum-Welch re-estimation algorithm is a generalized form of the Jax's training method. It is flexible and adaptive in modeling the statistical characteristic of training data. Therefore, it generates a better model to the training data, which results in an enhanced BWE system. According to experimental results, the new method performs much better than the Jax's BWE systemin all cases. Under the given test conditions, the RMS log spectral distortion(LSD) scores were improved ranged from 0.31dB to 0.8dB, and 0.52dB in average.
SoC Design of Self-Diagnosing Speaker Connection System
Song, Moon-Vin ; Kwon, Oh-Kyun ; Song, The-Hoon ; Chung, Yun-Mo ;
The Journal of the Acoustical Society of Korea, volume 26, issue 6, 2007, Pages 269~275
Pervasive Multi-channel audio systems are being realized due to advances in digital technology. This paper proposes an efficient system that serially connects individual speakers with bidirectional digital communication capability by means of SoC design. In particular, each speaker can identify the bit stream assigned to the speaker and convert it into analog audio. Furthermore, the speaker can self-diagnose the speaker functionality by utilizing the designed capability to measure frequencies of various square wave test signals. The proposed system running on 200MHz clock yielded restoration of analog output signal with latency of only
compared to directly driving the speakers in a traditional way.
Derivation of Parameters for Loudspeaker with Frequency Dependent Terms and Discussion for Estimation Methods
Park, Seok-Tae ;
The Journal of the Acoustical Society of Korea, volume 26, issue 6, 2007, Pages 276~285
In this paper it was discussed and compared measured loudspeaker impedance curve with ones reconstructed by TS parameters estimated using four kinds of parameter estimation methods developed in frequency domain. Frequency dependent parameters were introduced and derived using least square error minimization technique. For known dynamic mass TS parameter estimation methods were reviewed and also proved non-uniqueness of these parameters by simulation method. Minimum phase transformation was adopted to derive phase information from magnitude of loudspeaker electrical impedance curve measured by one channel analyzer.
A Study on Determining the Transmission Loss of Water-Borne Noise Silencer in a Sea-Connected Piping System
Park, Kyung-Hoon ;
The Journal of the Acoustical Society of Korea, volume 26, issue 6, 2007, Pages 286~292
The dominant source of noise in a sea-connected piping system is usually due to a seawater cooling pump which circulates seawater to operate onboard equipments normally, and so its water-borne noise with some tonal frequencies should be reduced using proper silencers. In order to obtain the transmission loss of water-borne noise silencers experimentally the present paper suggests a transfer function technique that acoustic wave in the piping system is decomposed into its incident and transmitted components when the reflection at the termination of the system exists. Good agreement in the interested frequency range with theory and the proposed technique shows the validity of the technique.
Experimental Study on the Characteristics of Turbulent Wall Pressure Fluctuation Over Compliant Coatings
Park, Kyung-Hoon ; Lee, Seung-Jae ; Shin, Ku-Kyun ;
The Journal of the Acoustical Society of Korea, volume 26, issue 6, 2007, Pages 293~300
Turbulent boundary layer over an underwater vehicle is formed when it moves underwater and wall pressure fluctuation within the turbulent boundary layer generates flow-induced noise by exciting the elastic hull of the underwater vehicle. One of the methods to reduce this flow noise is to attach a compliant layer on the surface of the vehicle. In order to observe the possibility of noise reduction in the water when the compliant layer treatments are applied on the surface, three types of specimens those are a bare steel plate, a steel plate coated with neoprene and a steel plate with polyurethane coating material are tested at various flow speeds in a low noise cavitation tunnel. This paper presents the results of measurements and analysis of wall pressure fluctuations which is a main source of flow noise, within the turbulent boundary layer on three specimens. Its results could be shown that about 10dB reduction of wall fluctuation pressure at high frequencies was achieved due to the dissipation of turbulent energy by the compliant coating while it makes the turbulent boundary layer thicker and changes the behavior of turbulent flow in the layer.
Detection of Underwater Transient Signals Using Noise Suppression Module of EVRC Speech Codec
Kim, Tae-Hwan ; Bae, Keun-Sung ;
The Journal of the Acoustical Society of Korea, volume 26, issue 6, 2007, Pages 301~305
In this paper, we propose a simple algorithm for detecting underwater transient signals on the fact that the frequency range of underwater transient signals is similar to audio frequency. For this, we use a preprocessing module of EVRC speech codec that is the standard speech codec of the mobile communications. If a signal is entered into EVRC noise suppression module, we can get some parameters such as the update flag, the energy of each channel, the noise suppressed signal, the energy of input signal, the energy of background noise, and the energy of enhanced signal. Therefore the energy of the enhanced signal that is normalized with the energy of the background noise is compared with the pre-defined detection threshold, and then we can detect the transient signal. And the detection threshold is updated using the previous value in the noisy period. The experimental result shows that the proposed algorithm has
error rate in the AWGN or the colored noise environment.