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Binaural Sound Source Localization based on Sub-band SNR Estimation
Zhou Lin,,Zhao Xiao-Yan,Cheng Xu,Wu Zhen-Yang 보안공학연구지원센터 2015 International Journal of Multimedia and Ubiquitous Vol.10 No.5
Sound Source Localization (SSL) has a wide application in speech separation, recognition and enhancement. Binaural sound source localization based on human spatial hearing mechanism is an important research field of SSL. The recent binaural SSL research is focused on the system robust against noise and reverberation. In order to improve the localization performance in degraded environment, this paper proposes an algorithm to adaptively select the ‘good’ sub-bands to compute the binaural localization cues. Firstly, sub-band Signal-Noise Ratio (SNR) is estimated based on the auto-correlation matrix of binaural sound signals. Then, Inter-aural Time Difference (ITD) is computed by adaptively selecting the sub-bands which have the high SNR. Since the ITD is calculated through the sub-bands which are less affected by the noise, the sound source azimuth is estimated more accurate. The simulation results show that compared to the conventional binaural SSL algorithm, the localization accuracy of the proposed algorithm has been improved significantly.
ZHOU Lin 보안공학연구지원센터 2015 International Journal of Hybrid Information Techno Vol.8 No.10
Enhancing the development competitiveness holds significance to the sustainable development of tourism cities. It is complex system engineering as the development competitiveness of tourism cities is influenced by many factors. Therefore, this paper studies the development competitiveness from ten dimensions, namely ecological factor, environmental factor, cultural factor, educational factor, scientific factor, civilizational factor, brand factor, economic factor, market factor and development potential factor. A multi-attribute evaluation model of the development competitiveness of tourism cities is established based on grey clustering analysis. Through the study of influence factors, grey clustering analysis function is established to obtain the grey clustering coefficient. Given that influence factors are distinct in terms of importance, the weighted grey clustering analysis model is established for the evaluation of development competitiveness of tourism cities. Finally, a case is studied to verify the model.
New Control Strategy for Three-Phase Grid-Connected LCL Inverters without a Phase-Locked Loop
Zhou, Lin,Yang, Ming,Liu, Qiang,Guo, Ke The Korean Institute of Power Electronics 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.3
The three-phase synchronous reference frame phase-locked loop (SRF-PLL) is widely used for synchronization applications in power systems. In this paper, a new control strategy for three-phase grid-connected LCL inverters without a PLL is presented. According to the new strategy, a current reference can be generated by using the instantaneous power control scheme and the proposed positive-sequence voltage detector. Through theoretical analysis, it is indicated that a high-quality grid current can be produced by introducing the new control strategy. In addition, a kind of independent control for reactive power can be achieved under unbalanced and distorted grid conditions. Finally, the excellent performance of the proposed control strategy is validated by means of simulation and experimental results.