最新刊期
卷 ， 期 4 ， 1993
- 摘要：In this paper, KL discreminant information of the modified Hidden Markov Model is proposed as a distortion measure for coarse classification in speech recognition. The feasibility of the classification method is proved, the clustering algorithm is given. The relationship between the rate of correct classification and the subset overlaping rate is shown in the experiments.关键词：speech recognition;hidden Markov model;classification2|39|4更新时间：2025-12-08
- 摘要：In this paper, we study three types of noisy speech enhancement algorithms based on Minimum Mean-Square Error Short-Time Spectral Estimation: Spectral Amplitude Estimation （MMSE-STSA）, LOG-Spectral Amplitude Estimation （LOG-MMSE-STSA）. and Relative Spectral Amplitude Estimation （MMSE-REL-STSA）. On the basis of theoretical analysis, experimental studies are conducted. Computer simulations show that SNR improvement of 3.4-12dB can be obtained after enhancement processing when the original SNR of noisy speech degraded by Additional White Gaussian Noise ranges from 5dB to-10dB. Among the three algorithms, MMSE-LOG-STSA provides the best SNR improvement, and the SNR results coincide with informal listening.We also study the reduction of residual noise accompanied by the enhanced speech. By using the center clipping and gain function modification of estimator, the residual noise can be reduced significantly.关键词：speech signal processing;speech enhancement;Short-time spectral estimation2|381|4更新时间：2025-12-08
- 摘要：In this paper, a new beamforming algorithm is proposed for reducing the signal cancellation in the presence of correlated interference. A new concept, the Split-Polartiy Transformation （SPT）, is introduced for decorrelating desired signal from interference. The design of SPT matrices is discussed. The proposed algorithm is applicable to arbitrarily configured arrays and robust against directional mismatch and array model errors to within some tolerance. Computer simulation results have demonstrated the effectiveness of SPT-LCMV beamforming algorithm.关键词：Adaptive antenna;beamforming;Coherent interference2|56|1更新时间：2025-12-08
- 摘要：Based on the eigenstructure decomposition method, a new kind of approach to high resolution space-time two dimensional signal spectrum estimation is presented in this paper. The signal subspace and the noise subspace are formed under eigenstructure decomposition of the space-time signal covariance matirx. By using the orthogonal properties of the two subspaces, we can gain a high resolution space-time spectrum. The presented method. Isapplied to phased array radars and can accurately get the information about the velocities and azimuth angles of spatial moving targets. The computer simulation results illustrate its availability.关键词：Space-time two-dimensional signal processing;spectrum estimation;array signal processing;radar signal processing2|93|2更新时间：2025-12-08
- 摘要：In this paper the power spectral density of p-adic stationary stochastic prosess under the sence of Chrestenson transform and its maximum entropy estimator are studied. The relationship formula between the power spectral density and the entropy rate and the normal equations of maximum entropy spectral estimator which is expressed in finite form are obtained. When the number of sampling data is p, the maximum entropy estimator can be directly expressed by the known finite autocorrelation data. These results are much different from those of Fourier’s.关键词：Chrestenson transform;p-adic stationary stochastic sequence;spectral estimation;signal processing2|51|0更新时间：2025-12-08
- 摘要：Under assumption on separable input processes, using the block-oriented model of nonlinear systems, a generalized Wiener-Hopf equation on adaptive nonlinear systems are derived in this paper. Based on this, the analytical solutions of inverse model of some nonlinear systems are obtained. Similar to common LMS algorithm, a useful algorithm used in inverse adaptive modeling of the nonlinear system is proposed. It is shown by simulations that weight values converge to the analytical solutions closely to the proposed algorithm.关键词：自适应;非线性;逆模;信道均衡2|45|1更新时间：2025-12-08
- 摘要：A neural network model with the global convergence is proposed and studied in this paper. The dynamical property of this model is described by dual differential equations and it can find out several stable equilibrium points from any initial point in the state space. This model Ican be extended easily to suit for the problems which need the global convergence such as the global optimization problems.关键词：neural networks;global convergence;Dual dynamic;energy function2|37|3更新时间：2025-12-08
- 摘要：This paper presents a matching and estimation algorithm for 3-D rigid body motions, integrating the procedures of the point match and motion estimation into a global optimization process. It solves the problems of matching, segmenting and estimating in the 3-D motions, extends the idea of first-match-then-estimate, and is suitable for real-time processing. A large number of experimental results have been described to demonstrate the efficiency of the algorithm.关键词：3-D rigid body motion;Point match;Motion parameter estimation;Global optimization2|78|1更新时间：2025-12-08
- 摘要：With AI technology in searching, Xu, et al. presented a global optimum feature selection algorithm, BF, which is computationally superior to B&B one. Based on the analysis of search tree TB used in BF, this paper proposes a new structure of search tree, Tb, on which there are fewer nodes than on TB. A feature selection algorithm on Tb, referred as to BF, is designed, of which the computational complexity is lower than BF’s, without increasing storage and with global optimum property.关键词：pattern recognition;Feature selection;artificial intelligence;Search tree;Global optimum2|145|5更新时间：2025-12-08
- 摘要：This paper puts forward to a multi- structure element technique for morphological shape decomposition. Its performances are beffer than single ones’. The basis of the method proposed relies upon the generaton of set of non-over lapping segments of an image via repeated basic morphological operations. The maximum core decomposition is chosen to guarantee the uniqueness. The searching scheme for optimal decomposition is based on heuristic search strategy. The image coding via morphotogical transformation is also discussed and the experimental results have shown the greot advantages of multi-element technique.关键词：mathematical morphology;Shape decomposition;Image coding;Heuristical search2|62|1更新时间：2025-12-08
- 摘要：A new hybrid coding scheme with subsampled DPCM and interpolative DP-CM is proposed in this paper. It may be utilized to 140 Mb/s transmission of HDTV signals without involving high speed complex processing. Computer simulation results show that high quality of reconstructed pictures can be obtained by the proposed coding scheme.关键词：HDTV;Picture coding2|12|1更新时间：2025-12-08
- 摘要：<正> 中国电子学会真空电子学学会第九后学术年会于1993年3月1～5日在浙江省新安江召开。42个单位的近120名代表到会。 年会由真空电子学会主任委凤刘盛刚教授主持,年会邀请学会老前辈吴祖凯,胡汉泉及有关专家作了“科技成果如何尽快转化为生产力”、“中国恢复关贸总协定缔约国地位对电子工业的影响”等7个大会专题报告。2|10|0更新时间：2025-12-08
- 摘要：In this paper, the throughput of unslotted FH-CDMA system is evaluated. As the channel traffic and the number of frequency slots, denoted by μ and q respectiv ely, approach infinity while μ/q remains constant, it is shown that the throughput of unslotted FH-CDMA system is the same as that of slotted system, and the maximum throughput of synchronous frequency-hopping system is twice that of asynchronous system. Besides, the numerical results show that it is a better way to employ unslotted system as compared with slotted system.关键词：Frequency-hop;throughput2|41|0更新时间：2025-12-08
- 摘要：Output queueing is the optimal switch of fast packet switching in performance. In this paper, the queueing performance of output queueing with arbitrary priority classes is studied. We derive the statistical characteristics, such as average queue length of any priority packet in independent and dependent packet arrival cases. It is found that for an N xN output queueing switch, the queueing performance of both cases tends to be the same if N is large enough. A numerical iteration is presented to get the stationary queue length distribution of high and low priority packets with queueing equation in two dimensional Markov process. The analyses are proved correct by computer simulation.关键词：Output queueing;Fast packet switching2|49|5更新时间：2025-12-08
- 摘要：HF channel’s burst-interference may destroy the equalization badly and makes the equalizer ineffective. This paper presents two methods to prevent equalizer from out of working and make equalization recover quickly. So the whole communication system can work successively. Computer simulation proves effectiveness of both methods.关键词：fading;Burst-interference;adaptive equalization;Main tap;Mean square2|123|3更新时间：2025-12-08
- 摘要：<正> 第三届中国国际通信学术会议（1992 Interna-tional Con ference on Communication techno-logy,ICCT’92）于1992年9月16日至18日在北京清华大学召开。这次国际会议由中国电子学会、中国通信学会和清华大学联合发起,并得到IEEE通2|18|0更新时间：2025-12-08
- 摘要：Different Schemes of intrafield prediction coding of HDTV component signals Y, U, V are discussed in this paper. According to the “Large Error Criterion”, the coding scheme is determined. And two nonlinear quantizers of luminance and chrominance with 16 levels are designed by the subjective tests. The subjective tests show that it is difficult to distinguish the reconstructed picture from the original one.关键词：HDTV;Large error criterion;Quantizer2|17|0更新时间：2025-12-08
- 摘要：In the paper, a biological neuron is simulated by means of MOS circuits, and a artificial neural network is constructed. In addition, a method of adjusting and measuring the neural circuit is given. The result of measurement shows that these circuits can simulate the biological function of neural cells quite well.关键词：神经网络;集成电路实现;MOS电路2|85|3更新时间：2025-12-08
- 摘要：In this paper, it will be verified that many current spectral estimation methods are corresponding to a same mathematic problem. A common matrix form for spectral estimation methods will be given and a series of new approaches to spectral estimation can be extended from it. As an example, procedures based on the eigenvector space of the correlation matrix are investigated.关键词：spectral estimation;Common matrix form;Eigen-space spectral estimation;singular value decomposition2|117|4更新时间：2025-12-08
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