检索结果-南通市图书馆

SPEECH ENHANCEMENT USING HARMONICS REGENERATION BASED ON MULTIBAND EXCITATION

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Electronics(China) 2011年第4期28卷 565-570页

作者： Zhang Yanfang Tang Kun Cui Huijuan national laboratory for {2. {3. and technology Tsinghua University Beijing 100084 China

This paper proposes an algorithm that adopts the harmonic regeneration as post-processing to improve the performance of speech enhancement using traditional Short Time Spectral Amplitude(STSA).The proposed algorithm aims to alleviate the distortion of the high harmonics of enhanced speech via the traditional STSA,and consequently improves the speech *** first detect the pitch,or fundamental frequency,of the enhanced speech via the traditional STSA,and then,divide the whole spectrum into multiple sub-bands which center on each *** that,a series of specially designed windows centered on each harmonic are applied to all the sub-bands,in order to redistribute the energy in the *** results of experiment demonstrate that the method has both theo-retical and practical basis.

关键词： Speech enhancement Short time spectral amplitude Harmonic regeneration Multiband excitation Pitch detection

Lithosphere types in North China:Evidence from geology and geophysics

在线全文

学校读者我要写书评

暂无评论

science China Earth sciences 2005年第11期48卷 1809-1827页

作者： QIU Ruizhao1,2. DENG Jinfu3. ZHOU Su3. LI Jinfa4, XIAO Qinghui1,5, WU Zongxu6 & LIU Cui3.1. Institute of Geology, Chinese Academy of Geological sciences, beijing 10003., China 2. Development and Research {2., China Geological Survey, beijing 10003., China 3. China University of Geosciences, beijing 100083. China 4. China University of Geosciences, Wuhan 43.074, China 5. information {2. of Ministry of Land and Resources, beijing 100812. China 6. Institute of Geology, State Seismological Bureau, beijing 10002., China 1. Institute of Geology Chinese Academy of Geological Sciences 100037 Beijing China 2. Development and Research center China Geological Survey 100037 Beijing China 3. China University of Geosciences 100083 Beijing China 4. China University of Geosciences 430074 Wuhan China 5. information center of Ministry of Land and Resources 100812 Beijing China 6. Institute of Geology State Seismological Bureau 100029 Beijing China

On the basis of the characteristics of geology and geophysics in North China, three types of lithosphere, namely, the cratonic, the orogenic and the rift lithospheres can be classified. In terms of petrological method (based on the information from Precambrian rock assemblages, igneous activities, deep-seated enclaves, etc.) and the relationship between seismic velocity and rock compositions, the crust-mantle petrological and chemical structure models can be set up. Researching results indicate that the geology and geophysics of North China platform bears the similar characteristics in comparison with those of the global typical cratons. The Eerduosi(Ordos) block located in the west of the North China Platform is a remnant of cratonic lithosphere after the North China platform had undergone “activation” in Mesozoic and “reconstruction” in Cenozoic times. The continental crust consists mainly of TTG rock assemblage while the subcontinental lithosphere mantle mainly consists of strongly depleted harzburgite. The craton was finally formed in late Archaean and early Proterozoic, and has been kept in stability up to present; its crustal-mantle petrological structures of lithosphere can be set up as a reference for the study of North China craton and even Sino-Korean craton. In the Mesozoic period, the middle and east areas of North China platform were activated in the Yanshanian orogenic process, the continental crust was reformed by material and heat-transfer of convective mantle and the original crustal TTG component was reconstructed to be granitic crust, and the subcontinental lithosphere man- tle was replaced by the Yanshanian harzburgite-lherzolite. The Yanshan-Taihang Mountains were the remnants of orogenic lithosphere after the rifting in eastern North China in Cenozoic. The present thickness of continental crust and lithosphere in the Yanshan-Taihang Mountains is not equal to their thickness during the Yanshanian orogenic movement because they had undergone the

关键词： lithospheric types,evidence of geology and geophysics,crust-mantle petrological structure,deep process

Influence of the cobalt concentration on optical and magnetic properties of zinc oxide

在线全文

学校读者我要写书评

暂无评论

Chinese science Bulletin 2010年第10期55卷 897-901页

作者： WANG LiWei,ZHANG FuJun,XU Zheng,ZHAO SuLing & LU LiFang Institute of Optoelectronics technology,beijing Jiaotong University Key {2. of Luminescence and Optical {3. (beijing Jiaotong University),Ministry of Education,beijing 100044,China Institute of Optoelectronics technology Beijing Jiaotong University Beijing China Ministry of Education Key Laboratory of Luminescence and Optical Information (Beijing Jiaotong University) Beijing China

A series of Co-doped ZnO thin films have been prepared by direct current reactive magnetron sputtering on glass *** structural characterization by means of X-ray diffraction (XRD) and scanning electron microscopy (SEM) gave no evidence of second phase *** qualitative composition and chemical state were characterized by energy dispersive X-ray spectroscopy (EDS) and X-ray photoelectronic spectrometry (XPS),*** results confirmed that Co was incorporated as Co3.,occupying the Zn2. sites in ZnO's wurtzite *** luminescence properties of the films were investigated by room temperature photoluminescence,and the optical properties were studied by optical *** magnetic analysis was carried out at room temperature and at 50 K by quantum Design MPMS (SQUID) *** results showed that all the Co-doped ZnO thin films prepared by direct current magnetron sputtering were not ferromagnetic above 50 K.

关键词：氧化锌钴氧化物磁性直流反应磁控溅射 X射线光电子能谱室温光致发光扫描电子显微镜纤锌矿结构

Synchronous estimation of DTM and fractional vegetation cover in forested area from airborne LIDAR height and intensity data

在线全文

学校读者我要写书评

暂无评论

science China(Technological sciences) 2008年第S2期51卷 176-187页

作者： BAO YunFei1,2.CAO ChunXiang1,ZHANG Hao1,CHEN ErXue3.HE QiSheng1,2.HUANG HuaBing1,LI ZengYuan3.LI XiaoWen1,4 & GONG Peng1 1 State Key laboratory of Remote Sensing {3.,jointly sponsored by the Institute for Remote Sensing Applications of Chinese Academy of {3.s and {3. Normal University,{3. 100101,China 2.Graduate University of the Chinese Academy of {3.s,{3. 100049,China 3.Institute of Forest Resource information Technique,the Chinese Academy of Forestry,{3. 100091,China 4 Research center for Remote Sensing and GIS,Department of Geography and {3. Key laboratory for Remote Sensing of Environment and Digital Sites,{3. Normal University,{3. 100875,China State Key laboratory of Remote Sensing science jointly sponsored by the Institute for Remote Sensing Applications of Chinese Academy of Sciences and Beijing Normal University Beijing 100101 China Graduate University of the Chinese Academy of sciences Beijing 100049 China Institute of Forest Resource information Technique the Chinese Academy of Forestry Beijing 100091 China Research center for Remote Sensing and GIS Department of Geography and Beijing Key Laboratory for Remote Sensing of Environment and Digital Sites Beijing Normal University Beijing 100875 China

We proposed a method to separate ground points and vegetation points from discrete return,small footprint airborne laser scanner data,called skewness change *** method,which makes use of intensity of laser scanner data,is especially applicable in steep,and forested *** does not take slope of forested area into account,while other algorithms consider the change of slope in steep forested *** ground points and vegetation points can be used to estimate digital terrain model(DTM) and fractional vegetation cover,respectively.A few vegetation points which were classified into the ground points were removed as noise before the generation of *** method was tested in a test area of 10000 square meters.A LiteMapper -5600 laser system was used and a flight was carried out over a ground of 700―800 *** this tested area,a total number of 1546 field measurement ground points were measured with a total station TOPCON GTS-602.and TOPCON GTS -7002.for validation of DTM and the mean error value is -18.5 cm and the RMSE(root mean square error) is ±2..9 cm.A data trap sizes of 4m in diameter from airborne laser scanner data was selected to compute vegetation fraction *** of fractional vegetation cover was carried out using 15 hemispherical photographs,which are georeferenced to centimeter accuracy by differential *** gap fraction was computed over a range of zenith angles 10° using the gap light analyzer(GLA) from each hemispherical *** R2.for the regression of fractional vegetation cover from these ALS data and the respective field measurements is *** this study presents a method for synchronous estimation of DTM and fractional vegetation cover in forested area from airborne LIDAR height and intensity data.

关键词： LIDAR intensity skewness synchronous DTM fractional vegetation cover

Key technologies for solid state lighting

在线全文

学校读者我要写书评

暂无评论

Key technologies for solid state lighting

Lunar surface dielectric constant,regolith thickness, and ~3.e abundance distributions retrieved from the microwave brightness temperatures of CE-1 Lunar Microwave Sounder

国际纳光电子学研讨会

作者： Yi Luo~(1 2. Yanjun Han~1 Keyuan Qian~2.(1)State Key laboratory on Integrated Optoelectronics/{3. {2. laboratory for information science and technology {3. University beijing China 100084. (2.Semicondutor Lighting Lab Graduate School at Shenzhen {3. University Shenzhen China 518055

＜正＞The latest development of the key technologies including improvement of the intemal quantum efficiency and external quantum efficiency of the high-power GaN-based LEDs,packaging and system application was review...

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

science China Earth sciences 2010年第9期53卷 1365-1378页

作者： WANG ZhenZhan1, LI Yun1,2. JIANG JingShan1 & LI DiHui1 1 national Microwave Remote Sensing laboratory, {2. for Space {3. and Applied Research, Chinese Academy of {3.s, beijing 100190, China 2.Graduate University of Chinese Academy of {3.s, beijing 100049, China 1. national Microwave Remote Sensing laboratory Center for Space Science and Applied Research Chinese Academy of Sciences Beijing 100190 China2. Graduate University of Chinese Academy of Sciences Beijing 100049 China

Lunar regolith parameters, such as physical temperature, thickness and dielectric constant, are important in studying regolith features, distribution of lunar resources and evolution of the Moon. There had been no measurement obtained by lunar-orbit-borne microwave radiometer applied to evaluate the properties of lunar regolith before CE-1 Lunar Microwave Sounder (CELMS) being launched. CEMLS is the first passive microwave radiometer in the world to sound the surface of the Moon. The brightness temperatures (TB) sensed by CELMS include complicated information on the above geophysical parameters. In this paper, algorithms of retrieving dielectric constant, regolith thickness, and 3.e content from CELMS brightness temperatures are developed, and the results are compared with those from literature. The results show that the regolith thicknesses are mostly in the range of 4.0-6.0 m, and 43. of them are bigger than 5.0 m. The content of 3.e evaluated by retrieved regolith thickness is about 1.03.million tons.

关键词： CE-1 Lunar Microwave Sounder (CELMS) lunar regolith dielectric constant lunar regolith thickness 3.e retrieval

Calculation of triaxial superdeformation in ^(174)Hf

在线全文

学校读者我要写书评

暂无评论

science China(Physics,Mechanics & Astronomy) 2007年第5期50卷 553-557页

作者： YU ShaoYing1,2.4, LI XiaoWei2. SHEN CaiWan1,5 & CHEN YongShou3.4 1 School of science, Huzhou Teachers College, Huzhou 3.3.00, China 2.College of Mathematics, Physics and information Engineering, Zhejiang Normal University, Jinhua 3.0}000, China 3.China Institute of Atomic Energy, {2. 102.13. China 4 Institute of Theoretical Physics, Chinese Academy of sciences, {2. 100080, China 5 center of Theoretical Nuclear Physics, national laboratory of Heavy Ion Accelerator of Lanzhou, Lanzhou 73.000, China 1. School of science Huzhou Teachers College Huzhou 313000 China 2. College of Mathematics Physics and Information Engineering Zhejiang Normal University Jinhua 321000 China 4. Institute of Theoretical Physics Chinese Academy of Sciences Beijing 100080 China 5. center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Accelerator of Lanzhou Lanzhou 730000 China 3. China Institute of Atomic Energy Beijing 102413 China

A two-dimensional Total Routhian Surface (TRS) calculation with the fixed hexa- decapole deformation ε4 = 0.03.was carried out for several configurations of 174Hf. Results indicate that the shell corrections have an important contribution to the formation of triaxial superdeformation in 174Hf and some possible configuration assignments are made to the 4 TSD bands experimentally found in 174Hf.

关键词： Total Routhian Surface (TRS), triaxial superdeformation, configuration

在线全文

学校读者我要写书评

暂无评论

关于Negabent函数的若干结论

通信学报 2011年第8期32卷 179-182页

作者：任传伦刘凤梅李忠献钮心忻杨义先北京邮电大学网络与交换技术国家重点实验室信息安全中心北京邮电大学网络与信息攻防技术教育部重点实验室华北计算技术研究所信息保障技术重点实验室天津市国瑞数码安全系统有限公司

利用二次不定方程的求解,研究了Negabent函数的判别和构造问题,给出了Negabent函数的一个直观判别条件和一种间接构造法,同时,证明了一类Maiorana-McFarland bent函数不是Negabent函数。

关键词：布尔函数 Nega-Hadamard变换 Negabent函数 bent函数

Monaural voiced speech segregation based on elaborate harmonic grouping strategies

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

science China(information sciences) 2011年第12期54卷 2491-2500页

作者： LIU WenJu 1 , ZHANG XueLiang 1 , JIANG Wei 1 , LI Peng 2.& XU Bo 2.1 national {3. of Pattern Recognition, Institute of Automation, Chinese Academy of {2.s, {3. 100190, China 2.Digital Media Content technology Research center, Institute of Automation, Chinese Academy of {2.s, {3. 100190, China 1. national laboratory of Pattern Recognition Institute of Automation Chinese Academy of Sciences Beijing 100190 China2. Digital Media Content Technology Research Center Institute of Automation Chinese Academy of Sciences Beijing 100190 China

In this paper, an enhanced algorithm based on several elaborate harmonic grouping strategies for monaural voiced speech segregation is proposed. Main achievements of the proposed algorithm lie in three aspects. Firstly, the algorithm classifies the time-frequency (T-F) units into resolved and unresolved ones by carrier-to-envelope energy ratio, which leads to more accurate classification results than by cross-channel correlation. Secondly, resolved T-F units are grouped together according to minimum amplitude principle, which has been verified to exist in human perception, as well as the harmonic principle. Finally, "enhanced" envelope autocorrelation function is employed to detect amplitude modulation rates, which helps a lot in reducing half-frequency error in grouping of unresolved units. Systematic evaluation and comparison show that performance of separation is greatly improved by the proposed algorithm. Specifically, signal-to-noise ratio (SNR) is improved by 0.96 dB compared with that of previous method. Besides, our algorithm is also effective in improving the PESQ score and subjective perception score.

关键词： computational auditory scene analysis voiced speech separation harmonistic principle minimum amplitude principle elaborate harmonic grouping strategies