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5th International Conference on Digital Image Processing (ICDIP)

作者： Fan, Qinru Ren Wen-Hua Zhejiang Univ Ningbo Inst Technol Commun Sci & Engn Dept Ningbo Zhejiang Peoples R China Zhejiang Police Coll Dept Comp & Informat Technol Hangzhou Zhejiang Peoples R China

ISBN: (纸本)9780819493057

For automatic speech recognition (ASR), the research centers mainly on algorithm of improving robust, researchers put less emphasis on realization and application of better speech algorithm. Real-time proceeding of speech recognition directly influence on its application, so real-time proceeding of speech recognition is as important as study of algorithm. Speech transform domain method is a necessary technique of speech recognition, so real-time analysis of transform domain method is necessary. In transform domain methods, the short-time spectrum analysis is simple and easy to realize, especially the short-time fft algorithm is applied to the short-time spectrum analysis. fft algorithm reduces multiplications greatly. For the purpose, this paper presents short-time spectrum analysis of real-time sampling speech based on fft algorithm. We use DSP TMS320VC5416 chip and speech codec ASIC TLV320AIC23 as hardware, the real-time speech signal is acquired by ASIC TLV320AIC23. When working frequency of TMS320VC5416 is set 160 MHz and sampling frequency is 44.1 kHz, the short-time fft is radix-2 DIF-fft algorithm and the length of short-time window is 128, the simulation waves and data show that the short-time fft algorithm analysis based on TMS320VC5416 chip can meet real-time of system. For estimation of proceeding error, we make a calculation of radix-2 DIT-Ifft. Comparing the result of DIT-Ifft and sampling speech data, error is less than 10(-3.)

关键词： short-time spectrum analysis fft algorithm the proceeding of real-time sampling speech DSP TMS320VC5416

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Design and Realization of the intelligent detector of electrical apparatus 3

Design and Realization of the intelligent detector of electr...

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3rd IEEE Advanced Information Technology, Electronic and Automation Control Conference (IAEAC)

作者： Zhang, GuoQin Zhejiang Univ Water Resources & Elect Power Hangzhou Zhejiang Peoples R China

ISBN: (纸本)9781538645093

The intelligent detector of electrical apparatus can automatically identify different electrical appliances and displays their working states. It can learn by itself. According to the specific design requirements, the optimal designing scheme has been worked out. The corresponding hardware circuit is designed according to the scheme, and the software is realized. Finally, the intelligent detector is debugged and realized and the test results meet the requirements of the design.

关键词： current detection voltage detection fft algorithm STM32

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Revised 2D Fast Fourier Transform

Revised 2D Fast Fourier Transform

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Open Conference of Electrical Electronic and Information Sciences (ESTREAM)

作者： Pupeikis, Rimantas Vilnius Univ Vilnius Gediminas Tech Univ Vilnius Lithuania

ISBN: (纸本)9781467374453

It is assumed here, that some signal samples in the respective period, available for processing digitally by the fast Fourier transform (fft) procedure for determining spectra of two-dimensional (2D) signals, are updated by a sensor in real time. It is urgent for each new sample that emerges to have a new 2D spectrum. The idea is that the 2D fft procedure should not be repeated for each new sample. It is needed just to modify the procedure when the new sample emerges and replaces the previous one. The recursive formulas for fft algorithms that refer to the modification and on-line calculation of 2D spectrum samples are obtained. Simulation results are presented here, too (see table, Figures 1 - 3).

关键词： Fast Fourier transform two-dimensional spectra signal sampling Fourier Transform fft algorithm Simulation results Sensors

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Passive Phased Micro Chip Array Antennas Near Field Amplitude-Phase Characteristics Measurment and Calibration 2

Passive Phased Micro Chip Array Antennas Near Field Amplitud...

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2nd ETP/IITA Conference on Telecommunication and Information

作者： Zhang, Ping Chuan Yang, Jun Hong Huazhong Univ Sci & Technol Wuhan 430074 Peoples R China

ISBN: (纸本)9789881824202

This paper proposed a new technique for calibrating microchip 8-elements phased array antennas algorithms based on near magnetic field characteristics. It can not only calibrate differences in the amplitude and phase, but also calibrate mutual coupling coefficient. This novel method uses fewer equipments and has good stabilization. And be widely applied to all practical purpose antenna projects.

关键词： Microchip phased array Near magnetic field Mutual coupling coefficient fft algorithm

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Field coupling to nonuniform microstrip transmission lines

Field coupling to nonuniform microstrip transmission lines

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IEEE International Symposium on Electromagnetic Compatibility

作者： Cheldavi, A Safavi-Naeini, S Rezai-Rad, G Iran Univ Sci & Technol Tehran 16844 Iran

ISBN: (纸本)0780365690

In this paper we present an efficient new method for frequency domain and transient analysis of the single nonuniform lossless microstrip transmission line excited by external electromagnetic wave. First the nonuniform transmission line has been subdivided into a large number of uniform sections called steplines. Then the effect of the externall wave on the uniform sections has been derived. Finally by applying the boundary conditions at the discontinuities of the steplines and satisfieng the terminal conditions the induced voltage and currents at the terminals has been derived. So, the solution in frequency domain is obtained, and then fft algorithm is used to find the time domain response of the line.

关键词： superconducting microstrips fft algorithm Distributed parameter circuits Nonuniform TIME DOMAIN RESPONSE INDUCED VOLTAGE Transient analysis discontinuities

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Digital signal processing for a level measurement system based on FMCW radar

Digital signal processing for a level measurement system bas...

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IEEE International Conference on Control and Automation

作者： Chen, Hai Li, Yan Wang, Xin-min Northwestern Polytech Univ Sch Automat Xian 710072 Peoples R China

ISBN: (纸本)9781424408177

A level measurement system based on FMCW radar is developed. The structure of the measurement system is introduced. The methods of digital signal processing for the system are investigated fft algorithm is employed to process frequency difference in low-accuracy situation. When the signal-to-noise ratio is high, the high accuracy measurement is obtained by the AR spectral estimation. An autocorrelation filter is applied to the measurement system to reduce the disturbances. The resolution of the system which employs the methods of signal processing reaches 1mm.

关键词： level measurement fft algorithm AR spectral estimation autocorrelation filter

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Virtual Hartmann-shack image applied in laser beam wavefront correction and numerical simulation method

Virtual Hartmann-shack image applied in laser beam wavefront...

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Annual Conference of the Chinese-Society-for-Optical-Engineering on Applied Optics and Photonics, China (AOPC)

作者： Zhou, Yanchao Xu, Bing Chen, Shanqiu Liu, Wenjin Wang, Shuai Chinese Acad Sci Inst Opt & Elect Key Lab Adapt Opt Chengdu 610209 Peoples R China Univ Chinese Acad Sci Detect Technol & Automat Devices Beijing 100049 Peoples R China

ISBN: (纸本)9781628418996

In adaptive optics, Hartmann-shack wavefront sensor and image acquired from camera has been widely used to detect incident wavefront and the application of laser wavefront correction. A numerical simulation method of generating high resolution virtual camera image, which is based on Fourier optics and realized by fft algorithm, is mentioned in this paper. In the condition of incident laser beam wavefront with only tilt phase aberration, calculating deviation of centroid offset between the result from virtual camera image and theoretical value, is compared to verify the accuracy of this numerical simulation method and virtual Hartmann-shack image generation model.

关键词： Adaptive optics virtual Hartmann-shack image laser beam wavefront correction Fourier optics fft algorithm numerical simulation

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Power factor detection methods based on Atmega128

Power factor detection methods based on Atmega128

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International Conference on Sustainable Energy and Environmental Engineering (ICSEEE 2012)

作者： Jiang, Zhengrong Ma, Dongming North China Univ Technol Power Elect & Motor Drivers Engn Ctr Beijing Peoples R China

ISBN: (纸本)9783037856345

There are three sampling methods for reactive power compensation controller, including active power factor detecting, reactive power detecting and reactive current detecting. This paper describes the power factor detecting, which use the avr microcontroller to detect load power factor, besides, the principles and characteristics of two different detection methods are presented, the detecting accuracy is compared between the same phase detecting method and using fft algorithm.

关键词： power factor avr microcontroller the same phase detecting method fft algorithm

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Development of Tools for Real-Time Betatron Tune Measurements at the Nuclotron

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PHYSICS OF PARTICLES AND NUCLEI LETTERS 2016年第5期13卷 583-585页

作者： Gorbachev, E. V. Kirichenko, A. E. Monakhov, D. V. Romanov, S. V. Volkov, V. I. Joint Inst Nucl Res Dubna Russia

A betatron tune measurement system was developed and tested at the Nuclotron. A white noise and chirp signals were used for transverse beam motion excitation. A custom FlexRIO digitizer module was developed which provides excitation signal generation for kicker electrodes and real-time signal acquisition from pickup electrodes. A high resolution fft algorithm was implemented inside a NI PXI FPGA module, connected to digitizer. The measurement system is integrated with the NICA control system based on the TANGO Controls. Results and tests performed with the Nuclotron beam are presented.

关键词： Tools Real-Time Betatron Tune Measurements Real time tuning EQUIPMENT measurement system Betatrons CHIRP SIGNALS fft algorithm Digitizers

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A Novel Image Encryption Method to Reduce Decryption Execution Time in Cloud 9

A Novel Image Encryption Method to Reduce Decryption Executi...

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9th Annual IEEE International Systems Conference (SysCon)

作者： Rad, Paul Muppidi, Mohan Jaimes, Aldo S. Agaian, Sos S. Jamshidi, Mo Univ Texas San Antonio Dept Elect & Comp Engn San Antonio TX 78249 USA

ISBN: (纸本)9781479959273

Parallel computing on cloud infrastructure had gained tremendous attention and popularity in recent years. In this paper, we propose a new technique to encrypt an image for secure image transmission and parallel decryption using cloud resources. The encoding of the image is done using the fft conjugate complex property and private random phase key value shared between sender and receiver. First, using fft complex conjugate property, we construct a two dimensional matrix consisting of real and imaginary portion of the image. Second, we encrypt the complex conjugate matrix using private random phase key value shared between sender and receiver. Detailed simulations have been carried out to test the encryption algorithm. Furthermore, we use cloud resources for the development of an efficient parallel image encryption and decryption algorithm. Significant speedup was achieved using different image size and number of cloud servers.

关键词： Image encryption Decryption Cloud computing fft algorithm Parallel image processing Image Histogram

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