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Multi-channel Audio System Based on Human Psychoacoustic Model
Sung, Koeng-Mo 이화여자대학교 음악연구소 2004 하계 국제학술회의 자료집 Vol.2004 No.-
3-channel microphone array systems are used in multi-channel audio applications, such as home theatre systems. With microphone array signals, the loudspeakers' positions can be calculated based on the spatial information of an auditory space. Using newly proposed virtual loudspeaker positioning algorithms, we seek to reconcile disagreements in loudspeaker positioning recommendations. We also use the position information to align the levels of multiple loudspeakers for total binaural energy. Directional impulse responses are then measured by 5-channel microphone array systems, and the artificial sound field is generated with these directional impulse responses.
Objectively Quantified Consonance of Complex Sounds
Sang Bae Chon,Mingu Lee,In Yong Choi,Koeng-Mo Sung 대한전자공학회 2008 ICEIC:International Conference on Electronics, Inf Vol.1 No.1
In this paper, objectively quantified consonance of complex sound is proposed as a new psychoacoustical parameter. Proposing algorithm quantifies consonance of complex sound after applying psycho acoustical models which are parts of human perception such as masking effect, equal loudness contour, and critical band. To verify proposing algorithm, experiments with 10 car horn signals which have different complex sound were performed. The experiments show cross correlation of 0.95 between objectively quantified consonance by proposing algorithm and subjectively assessed consonance by listening tests. Considering the fact that there are few psychoacoustical parameter except Zwicker parameters, proposing algorithm will help to quantify psychoacoustical effect of complex sounds objectively.
전상배(Sang Bae Chon),성굉모(Koeng-Mo Sung) 大韓電子工學會 2010 電子工學會論文誌-SP (Signal processing) Vol.47 No.5
본 논문에서는 이어폰의 주관 평가 기법에 대해서 소개한다. 음질의 주관 평가는 동시비교를 위한 평가 자극간의 즉각적인 스위칭을 제공하도록 설계되어야 한다. 그럼에도 불구하고 이어폰의 음질 평가의 경우에 있어서는, 물리적으로 평가 자극간의 즉각적인 스위칭이 불가능하여 직접적인 주관 평가에 어려운 점이 있다. 이에, 본 논문에서는 각 이어폰으로부터의 자극을 녹음하여 녹음된 자극간의 동시 비교를 통하여 이어폰을 평가하는 방법을 제안하고, 이에 필요한 선처리들과 평가 결과에 대하여 소개한다. In this paper, a subjective assessment for sound quality evaluation of earphones is introduced. Although instantaneous switching among assessed stimuli is very important in the subjective assessment from the simultaneous comparison's point of view, it is physically impossible in the subjective assessment of earphone. Thus, this paper proposes an indirect assessment method using recorded stimuli and accompanied pre-processing and the assessment results are presented.
Time-Varying Signal Parameter Estimation by Variable Fading Memory Kalman Filtering
Lee, Sang-Wook,Lim, Jun-Seok,Sung, Koeng-Mo The Acoustical Society of Korea 1998 韓國音響學會誌 Vol.17 No.e3
This paper prolposes a VFM (Variable Fading Memory)Kalman filtering and applies it to the parameter estimation for time-varying signals. By adaptively calculating the fading memory, the proposed algorithm does not require any predetermined fading memory when estimating the time-varying signal parameter. Moreover, the proposed algorithm has faster convergence speed than fixed fading memory one in case the signal contains an impulsive outlier. The performance of parameter estimation for time-varying signal is evaluated by computer simulation for two cases, one of which is the chirp signal whose frequency varies linearly with time and the other is the chip signal with an impulsive outlier. The experimental results show that the VFM Kalman filtering estimates the parameter of the chirp signal more rapidly than the fixed fading memory one in the region of an outlier.
Filtering of a Dissonant Frequency for Speech Enhancement
Kang, Sang-Ki,Baek, Seong-Joon,Lee, Ki-Yong,Sun, Koeng-Mo The Acoustical Society of Korea 2003 韓國音響學會誌 Vol.22 No.e3
There have been numerous studies on the enhancement of the noisy speech signal. In this paper, we propose a completely new speech enhancement scheme, that is, a filtering of a dissonant frequency (especially F# in each octave of the tempered scale) based on the fundamental frequency which is developed in frequency domain. In order to evaluate the performance of the proposed enhancement scheme, subjective tests (MOS tests) were conducted. The subjective test results indicate that the proposed method provides a significant gain in audible improvement especially for speech contaminated by colored noise and speaking in a husky voice. Therefore when the filter is employed as a pre-filter for speech enhancement, the output speech quality and intelligibility is greatly enhanced.
Reduced Complexity Self-Tuning Adaptive Algorithms in Application to Channel Estimation
Seongwook Song,Koeng-Mo Sung Institute of Electrical and Electronics Engineers 2007 IEEE transactions on communications Vol.55 No.8
<P>In this letter, reduced complexity self-tuning algorithms are proposed using simplified parameter updating procedures. Convergence analysis based on the independence assumption and the ordinary differential equation (ODE) method shows that the tuning parameter of the proposed algorithm attains the same limit as the conventional self-tuning adaptive algorithm. Simulations are carried out for channel estimation to support the analysis and performance of the proposed algorithms.</P>
박상하,노정욱,성굉모,Park, Sang-Ha,Noh, Jung-Uk,Sung, Koeng-Mo 한국음향학회 2008 韓國音響學會誌 Vol.27 No.4
본 논문에서는 편경 제작에 사용되는 경석 표본의 기본적인 역학적 물성을 측정하였다. 물성값들은 돌을 파괴하지 않고 음파를 이용하여 측정되었고, 측정한 물성값들은 경석 표본의 밀도 및 준종파 (extensional wave)와 굽힘파 (bending wave)의 고유 진동 주파수, 그리고 이를 통하여 구한 영률 (Young's modulus)이다. 영률을 구하기 위하여 준종파와 굽힘파의 주파수 스펙트럼 분석을 통해 얻은 첫 번째 고유 진동 주파수 값을 이용하였고, 보의 준종파와 굽힘파에 대한 이론적 고찰과 실험으로 경석 표본의 영률을 구하였다. 그 결과, 준종파와 굽힘파의 고유 진동 주파수로 2%의 이내의 편차를 갖는 경석 표본의 영률을 구하였다. In this paper, we have measured the fundamental properties of chime stone for Pyeongyeong. The properties are measured by wave propagation in the stone without destroying the stones, the measured properties are the chime stone density, natural frequencies of extensional wave and bending wave, and Young's modulus which is calculated by the measured properties. To find a value for Young's modulus, the fundamental frequencies which are obtained through spectrum analysis of extensional wave and bending wave are used. We calculated Young's modulus of chime stone by theoretical study and measurement on extensional wave and bending wave of the beam. As a result, we obtained Young's modulus by the fundamental frequencies of extensional wave and bending wave which deviation is within 2%.