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IEEE International Conference on Acoustics, Speech, and Signal Processing

作者： Schäfer, F Träger, J Fettweis, G Dresden Univ Technol Mobile Commun Syst Chair D-01062 Dresden Germany

ISBN: (纸本)0780374029

Due to the permantly increasing computing power eigen-value decompositions in real time embedded systems become more and more feasible. Applying a series of orthorgonal similarity transforms, so called Jacobi rotations, provides one approach of solving the symmetric eigenvalue problem. Jacobi rotations are suitable for hardware implementation because of their regularity and their inherent parallelism. However, the calculation of the rotation parameters requires numerical operations which increase the hardware effort and processing time dramatically. We propose a new algorithm with considerably less hardware requirements but still having good numerically properties. Our new algorithm only needs one division with reduced precision and a small look-up table. Square roots, farther divisons and other operations all with fall precision are now unnecessary. Especially in highly parallel systems like systolic arrays a considerable amount of calculation time can be saved while decreasing the hardware effort.

关键词： Jacobian matrices eigenvalues and eigenfunctions embedded systems table lookup systolic arrays iterative methods fast algorithm Jacobi rotations hardware requirements eigenvalue decompositions real time embedded systems orthogonal similarity transforms inherent parallelism look-up table systolic arrays iterative solution Jacobi matrix

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A fast algorithm for Motion and Disparity Estimation Based on the Reference Directions of Neighboring Macroblocks

A Fast Algorithm for Motion and Disparity Estimation Based o...

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International Conference on Mechatronics and Semiconductor Materials (ICMSCM 2013)

作者： Kong Xiangjun Zhao Yan Fan Qian Wang Shi-gang Chen Hexin Jilin Univ Coll Commun Engn Changchun 130012 Peoples R China

ISBN: (纸本)9783037859391

As for JMVC (Joint Multi-view Video Coding), when executing motion and disparity estimation simultaneously, the implicit correlation of reference directions between current and neighboring macroblocks is neglected, and this will lead to useless searching. To reduce this redundancy, we propose an estimation algorithm which sets search ranges properly by exploiting the mentioned correlation. The proposed algorithm first gets the reference directions of macroblocks in the left, top and top right direction of current macroblock, and compares them with current reference direction, then sets search ranges by the comparison results, executes motion and disparity estimation in the new ranges at last. Experimental results show that the proposed algorithm can save 28.98%- 46.30% of coding time without degradation of coding quality comparing to JMVC.

关键词： JMVC motion estimation disparity estimation fast algorithm

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A fast algorithm for Three-level SVPWM in NPC Inverters Based on Traditional Three-level SPWM

A Fast Algorithm for Three-level SVPWM in NPC Inverters Base...

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2nd IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG)

作者： Li Ning Wang Yue Jiang Yingwei Wang Zhaoan Xi An Jiao Tong Univ Xian Peoples R China

ISBN: (纸本)9781424456703

A fast algorithm for three-level space vector pulse wide modulation (SVPWM) in neutral point clamped (NPC) inverters based on traditional three-level sinusoidal pulse wide modulation (SPWM) is proposed. The acting time relation of each state in each phase is got by deeply researching the similarities and differences of three-level SPWM and SVPWM. This algorithm can realize all kinds of state sequences easily, it does not need to do trigonometric function, irrational operation and coordinate transformation, it just needs ordinary arithmetic, therefore the calculation is very simple and the result is much more accurate. The fast algorithm can be easily implemented on microprocessor and the executing speed is faster than the conventional three-level SVPWM algorithm.

关键词： fast algorithm three-level SVPWM acting time relation state sequences

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A fast algorithm for Fractional Fourier Transform with Zooming-in Ability

A Fast Algorithm for Fractional Fourier Transform with Zoomi...

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4th International Conference on Wireless Communications, Networking and Mobile Computing

作者： Zhao Xinghao Tao Ran Wang Yue Beijing Inst Technol Dept Elect Engn Beijing 100081 Peoples R China

ISBN: (纸本)9781424421077

In this paper, we present a novel algorithm for FRFT with zooming-in ability, which is preferable to previous algorithms because it can freely choose computational resolution and zoom In on any interested portion of the fractional speatra, meanwhile, retains the advantage of the Ozaktas algorithm In computational speed. Its advantages in scrutinizing the fine structure of the partial spectra and improving estimation accuracy of chirp central frequency are illustrated by an application example.

关键词： FRFT fast algorithm zoom in partial spectra

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An Improved fast algorithm of Spacecraft Separation Distance Calculation

An Improved Fast Algorithm of Spacecraft Separation Distance...

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International Forum on Mechanial and Material Engineering (IFMME 2013)

作者： Hao, Zilong Liu, Xinjian NUDT Coll Aerosp Sci & Engn Changsha 410073 Hunan Peoples R China

ISBN: (纸本)9783037858004

A faster algorithm for calculating the shortest distance between two spatial bodies based on existing algorithms was presented. A simulation analysis of missile model's separation process was built by using this algorithm. The simulation proved that this algorithm has the same precision and faster speed compared with other existing algorithms.

关键词： distance calculation fast algorithm monotonic concave MATLAB simulation

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fast algorithm of the robust Gaussian regression filter for areal surface analysis

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MEASUREMENT SCIENCE AND TECHNOLOGY 2010年第5期21卷 055108-055108页

作者： Zeng, W. Jiang, X. Scott, P. J. Univ Huddersfield Ctr Precis Technol Sch Comp & Engn Huddersfield HD1 3DH W Yorkshire England Taylor Hobson Ltd Leicester LE4 9JQ Leics England

In this paper, the general model of the Gaussian regression filter for areal surface analysis is explored. The intrinsic relationships between the linear Gaussian filter and the robust filter are addressed. A general mathematical solution for this model is presented. Based on this technique, a fast algorithm is created. Both simulated and practical engineering data (stochastic and structured) have been used in the testing of the fast algorithm. Results show that with the same accuracy, the processing time of the second-order nonlinear regression filters for a dataset of 1024*1024 points has been reduced to several seconds from the several hours of traditional algorithms.

关键词： surface characterization areal surface analysis Gaussian regression filter fast algorithm robust filter

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A fast algorithm FOR THE HOURLY SIMULATION OF GEOTHERMAL HEAT EXCHANGER

A FAST ALGORITHM FOR THE HOURLY SIMULATION OF GEOTHERMAL HEA...

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7TH International Symposium on Heating, Ventilating and Air Conditioning, ISHVAC 2011

作者： Zhang, X. S. Chen, Y. M. Liu, X. W. Hunan Univ Coll Civil Engn Changsha 410082 Hunan Peoples R China

ISBN: (纸本)9789628513802

The development and solution of heat transfer model for geothermal heat exchanger (GHE) is the key in the research and application of ground source heat pump (GSHP). An analytic solution of heat transfer problem in the GHE has been obtained by Zeng(2002) based on the superposition principle. However, analytic solution is quite time-consuming in long-time hourly simulation, which is caused by convolution in calculation. This paper improved the convolution using fast Fourier Transform (FFT) approach. The algorithm present in this paper can realize fast calculation of long-time hourly simulation for fluid temperature response inside the pipe.

关键词： Geothermal heat exchanger Finite line-source G-function FFT fast algorithm

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Analysis of fast algorithm of Matrix-Vector Multiplication for the Bank of Digital Filters

Analysis of Fast Algorithm of Matrix-Vector Multiplication f...

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Conference on Systems of Signal Synchronization, Generating and Processing in Telecommunications (SYNCHROINFO)

作者： Kreyndelin, V. B. Grigorieva, E. D. Moscow Tech Univ Commun & Informat Moscow Russia

ISBN: (纸本)9781728160726

algorithms of implementation of vector-matrix multiplication are presented, which are intended for application in banks (sets) of digital filters. These algorithms provide significant savings in computational costs over traditional algorithms. At the same time, reduction of computational complexity of algorithms is achieved without any performance loss of banks (sets) of digital filters. As the basis for the construction of algorithms proposed in the article, the previously known Winograd method of multiplication of real matrices and vectors and two versions of the method of type 3M for multiplication of complex matrices and vectors are used. Methods of combining these known methods of multiplying matrices and vectors for building digital filter banks (sets) are considered. The analysis of computing complexity of such ways which showed a possibility of reduction of computing complexity in comparison with a traditional algorithm of realization of bank (set) of digital filters approximately in 2.66 times - at realization on the processor without hardware multiplier is carried out;and by 1.33 times - at realization on the processor with the hardware multiplier. These indicators are markedly higher than those of known algorithms. Analysis of sensitivity of algorithms proposed in this article to rounding errors arising by digital signal processing was carried out. Based on this analysis, an algorithm is selected that has a computational complexity smaller than that of a traditional algorithm, but its sensitivity to rounding errors is the same as that of a traditional algorithm. Recommendations are given on its practical application in the development of a bank (set) of digital filters.

关键词： multirate signal processing Bank (set) of digital filters fast algorithm sensitivity to calculation errors 3M method Winograd method

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Study on the Physical Mechanism and the fast algorithm of A TC Constrained by Transient Stability for the Point-to-grid Transmission System

Study on the Physical Mechanism and the Fast Algorithm of A ...

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General Meeting of the IEEE-Power-and-Energy-Society

作者： Qin, Xiaohui Li, Baiqing Guo, Qiang Ma, Shiying Sun, Yujiao Ding, Jian Zhou, Qinyong Zeng, Pingliang Liu, Nan Zhao, Liang China Elect Power Res Inst Power Syst Dept Beijing Peoples R China State Grid Corp China AC Construct Dept Beijing Peoples R China State Grid Corp China Dept Dev Beijing Peoples R China

ISBN: (纸本)9781467380409

With the planning and constructing of UHV grid in China, some huge thermal plant bases are going to be connected to the receiving grid via UHV transmission lines. Therefore, it is significant and urgent to study the ATC (available transfer capability) of the point-to-grid transmission system quickly for each connection scheme in planning stage. In the paper, firstly, the physical mechanism of ATC constrained by transient stability is analyzed in depth. Secondly, the analytical solution of the ATC constrained by transient stability is proposed on the basis of the physical mechanism analysis. Thirdly, a fast feasible algorithm of the A TC constrained by transient stability is proposed, and the algorithm is independent of the electromechanical time domain simulation software. At last, the result of the proposed algorithm is compared with that of the conventional algorithm for the given point-to-grid UHV transmission case, and the correctness and the effectiveness of the proposed algorithm are verified.

关键词： ATC Point-to-grid Transmission System Transient Stability Physical Mechanism fast algorithm

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A fast algorithm for Intra-prediction Mode Selection Based on Block Feature

A Fast Algorithm for Intra-prediction Mode Selection Based o...

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8th International Conference on Intelligent Computing (ICIC)

作者： Yang, Jianren Wang, Qijun Wuhan Univ Natl Engn Res Ctr Multimedia Software Wuhan 430072 Peoples R China China Elect Technology Grp Corp Inst 38 Hefei Peoples R China

ISBN: (纸本)9783642315756;9783642315763

H.264/AVC video coding has permeated into every aspect of life, a new proposal has been present, which calculate the variance of the eight elements of the block to delete prediction mode selection. But this algorithm is more suitable for smooth changes in the sequence of the images. Therefore, this paper proposes an improved algorithm for intra prediction mode selection to solve the problem mentioned above. Using this method on the ARMv4 phone platform into which has been transplanted the x264;the speed is 13.2% higher than original algorithm when only changing the 4x4 luminance blocks, while 4.86% than the new proposal mentioned abroad. The speed can be improved about 0.5 to 2 fps when I modify the 16x16 luminance and 8x8 chrominance blocks making another progress in intra-coding, bringing H.264/AVC more potential applications.

关键词： H.264/AVC intra prediction coding fast algorithm

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