最新刊期
卷 ， 期 1 ， 1994
- 摘要：This paper introduces the modern spectral estimation method in to cross-spectral estimation,the cross-correlation-based Yule-Walker equation is proposed. Based on this contribution, the Moment estimation method and Levinsion recursive algorithm are developed. The new algorithms can overcome efficiently the shortcomings of low resolution and high variance which are existing in both FFT and Cross-periodogram methods. Finally, we compare the proposed algorithm with the well-known methods, Pisarenko and SVD methods, by using the parameter estimation results of sinusoids in strong measurement noise （SNR = -30dB） .关键词：Cross-spectral estimation;measurement noise;Weak signal mesurement;Levinsion algorithm2|533|32更新时间：2025-12-08
- 摘要：Since the widely used Hidden Markov Model（HMM）in speech recognition is first order Markov Model, it can not fully model the temporal dependence of speech signal. Although HMM can be extended to higher order Markov Model theoretically,the exponential increase of required computation and memory makes it difficult to use.Therefore,a new model is proposed in this paper,it is constructed by combining HMM with a multi-variable Gaussian density which can depict the temporal dependence of speech signal. The reasonableness of the new model is discussed theoreically. The experiment for all Chinese syllables with tone disregarded（total of 409 syllables）recognition shows that recognition rate of the new model is always significantly better than that of HMM.Furthermore,a discrete smoothed statisical histogram is used to model the state duration,because we found in the experiment that continuous density function,such as Gaussian,Gamma etc.,can not satisfactorily depict the state duration of either HMM or the new model.关键词：speech recognition;HMM2|632|59更新时间：2025-12-08
- 摘要：This paper first puts forward a new type of image morphological transformation ,induces the condition under which the original image can be restored with no distortion, and shows several important properties. In order to eliminate the noise possidly existed in the transforming domain,the representation for binary image using two types of transformation is proposed. The optimal restoration in a noisy environment is discussed. Theoretical analysis and computational results have shown this method is better than the usual skeleton transformation.关键词：Morphological skeleton transformation;Noise elimination;Image coding;Image restoration2|30|2更新时间：2025-12-08
- 摘要：A new method for limited-view tomographic image reconstruction is presented here. Weierstrass approximation theorem for trigonmetric polynomials is used to estmate the missing data. After the set of projection data is completed, image recoestructionriedcarried out by the filtered back-projection method.the performance of the proposed method is illustrated by examples.关键词：Tomography;Approximation theorem;least squares method;Filtered backprojection2|106|6更新时间：2025-12-08
- 摘要：The copy theory of generalized Walsh function is first introduced in this paper. And then the relation between the generalized Radamche function and the generalized shift copying is discussed in detail.The general presentation of generalized Walsh function with different ordering is derived by means of the multiplication of generalized Radamache function. Finally,the generalized Bridge function is constructed using the copy theory. A lot of multi-valued orthogonal function, such as Watari function,can be derived from it.The copy theory can also be used in the field of mult-valued logic.关键词：Generalized Walsh function;Copy theory;Generalized Bridge function;General presentation;Watari function2|99|3更新时间：2025-12-08
- 摘要：Based on[1],the frequency distance constrained cochannel/adjacent-channel assignment problern is solved.Futhermore,by using generalized graph coloring models,a generalized algorithm for the frequency distance constrained/frequency constrained channel assignment is presented in this paper.关键词：frequency assignment;constrait;graph coloring;algorithm.2|340|33更新时间：2025-12-08
- 摘要：我国第一套ＶＸＩｂｕｓ雷达自动测试系统研究成功林茂六，韩雪松（哈尔滨工业大学哈尔滨１５０００１）一、引言为满足武器系统及空间设备自动化测试的需，跟踪国际自动化测试水平，哈尔滨工业大学和航天工业总公司第３５研究所联合承担了＂ＶＸＩ总线雷达自动测试系统＂...2|52|1更新时间：2025-12-08
- 摘要：Based on the analysis of matrix theory and optimal permissible solution set,a phase perturbation calculating method in phase-only nulling arrays-MDLS method （the Modified Damped Least Square method）is firstly presented,which can be used to solve both the small and the large phase perturbation problems,accurately, efficiently and stably. calculation examples of a sinc pettern array and Taylor pattern array are then given. Finally,the phase variations of different elements are studied. It is shown that the last couple elements are the key elements. This conclusion offers reference to element selection in partial adaptive phase nulling arrays.关键词：Phase perturbation;Array pattern;Deep null;MDLS method2|55|4更新时间：2025-12-08
- 摘要：In this paper,the Linear-Exponential（L.E） algorithm are presented that is bassed on the optimal gradient estimation of steepest descent method .This point out that in order to improve the LMS algorithm performance, the gradient are optimally estimated, or the error signal are nonlinearity processed,these methods are equipollent. The theoreticaloanalysis and computer simulation show the performance of L.E algorithm is better than the L. S algorithm performance that is presented by [1]. The computer simulation result shows that very good match with the theoretical analysis.关键词：steepest descent method;Optimal estimation;Error nonlinearity processed2|749|119更新时间：2025-12-08
- 摘要：This paper simply describes features of IMS A110, which is a kind of special-purpose DSP and is called image and signal processing sub-system. It presents a creative thought to use pipe-line working pattern of circulation and discusses the principle of a real-time image processing system based on the creative thought.关键词：Special-purpose digital signal processor;pipe-line working pattern of circulation;Real-time image processing system2|127|4更新时间：2025-12-08
- 摘要：In the fields of computer and network,the heterogeneity of systems and networks has arisen due to several reasons.The studies onteconnection, interworking, interoperation between heterogeneous networks have, therefore,attracted the extensive attention. In this paper, we give our opinions and understanding of some important concepts relative to this studies, e.g.network interconnection,internetworking, interworking, interoperation, and network intercennectionrarchitecture,etc.These would be helpful to the related research.关键词：计算机通信;计算机网络;通信网;网络互连;互操作2|128|9更新时间：2025-12-08
- 摘要：Signal subspace-based high resolution algorithms are usually sensitive to various uncertainties such as locations errors,amplitude and phase errors in the receivers etc.It is demonstrated in this correspondence that the signal subspace method sensitivity can be significantly decreased by utilizing preliminary emitter direction estimates and a priori knowledge regarding the array geometry with a projection operator.Numerical results are also presented.关键词：antenna array;direction finding;signal subspace;robustness;projection operator2|140|12更新时间：2025-12-08
- 摘要：Based on the continuity and smothness of target tracks in the image sequence,and non-lin-ear detection scheme which transfer the problem of detection to the problem of miniminimizing an overall cost function is formulated.Two algorithms corresponding to track of maneuvering as well as non-maneuvering targets are discussed in detail. The detection performance is also estimated.关键词：Digit image processing;point target detection;Cost function.4|189|9更新时间：2025-12-08
- 摘要：In this parper an approach,which may directly design the OTA-C filters based on the SFG of the transfer function,is presented. By means of it,we have successfully designed three types of first-order circuits and three types of second-order circuits, which have not been issued so far and provide a simple and intuitive approach to design OTA-C filters.关键词：SFG;OTA-C Filter2|62|5更新时间：2025-12-08
- 摘要：In this paper we present a generalized algorithm of the optimal TSP scheme proposed in [1]. The algorithm is capable of triangulating the arbitrarily sinuous and entangled simple polygon. Its extensions to outer or inner triangulation of simple polygons with or without polygonal holes are also described.关键词：Simple polygon decomposition;Delaunay triangulation;optimal algorithm;Graphics and Computer geometry2|239|27更新时间：2025-12-08
- 摘要：An optimal design method, taking zeros and poles of a network as optimal variables, for the baseband forming network with the raised cosine roll-off is presented in this paper. Anormalized design data table for 8 different roll-off factors（a≥0. 2）has been obtained by using this method. Several key problems in the optimal design are introduced as well.关键词：optimization;digital communication;Forming network2|90|3更新时间：2025-12-08
- 摘要：After an introduction is given to the recovery question of band-limited signal and corresponding algorithm,another sort of recovery question of band-limited signal,which is under the condition: given part value of some signal on time-domaim and part value of its Fourier transform, is theoretically discussed in datail,and corresponding algorithm is given. Moreover the convergence of the algorithm is proved, and the uniqueness of the algorithm is studied.关键词：band-limited signal;signal recovery;Extrapolation2|140|5更新时间：2025-12-08
- 摘要：Vector encoding plays an important role in the Automatical read-in systems of engineering drawings.In this paper,we present a new method of vector encoding. It is based on the edge detection along the two-orthogonal LAG. The method has the advantages of high data compress and good edge effect, which can overcome the deffect of one direction LAG. We’ll explain its form,feature and its algorithm in the paper. Finally,a graphy by means of RTV and recognition is given.关键词：Binary image;RLE （Run length encoding）;LAG （Line adjacency-graph）;RTV （Raster-to-vector）;Vector encoding;pattern recognition2|40|1更新时间：2025-12-08
- Technical support is provided by Beijing Founder electronics co., LTD 京ICP备09064830号-19
京公网安备11010802024621 - It is recommended to read the content of this site in Chrome&IE9+. Please switch to extreme mode in browser 360.
- Cookies We use cookies to help provide and enhance our service and tailor content. By continuing, you agree to the use of cookies.
0