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Harmonic and Inter-Harmonic Detection Based on FFT and Nonlinear Optimization
Applied Mechanics and Materials, 2012In order to analyze harmonic and inter-harmonic parameters more accurately, a new detecting method that combined the nonlinear least squares and fast Fourier transform(FFT) was proposed. The FFT was used to produce a rough estimated value of harmonic parameters and then the signal model was set.
Huai Qing Zhang, Ran Liu, Hao Xiong
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Harmonic and inter-harmonic detection based on synchrosqueezed wavelet transform
2016 IEEE Information Technology, Networking, Electronic and Automation Control Conference, 2016To perfectly detect the amplitude for high frequency harmonic and inter-harmonic of small signal, separate the close frequency and improve accuracy of the detection time in dynamic system, a harmonic and inter-harmonic detection method based on synchrosqueezed wavelet transforms (SST) is proposed.
Man Weishi, Wang Jianhua, Kang Qing
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Harmonic and Inter-harmonic Detecting Based on Support Vector Machine
2005 IEEE/PES Transmission & Distribution Conference & Exposition: Asia and Pacific, 2005Based on the linear regressive model of the support vector machine, the paper introduces iterative re-weighted least squares of the support vector machine for signal spectral analysis by virtue of abstract expressions of cost functions, and the uniform mathematical analytical expression of support vector machine for solving the problem of signal ...
null Li Ma +2 more
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Alternating current sensor with second-harmonic detection
Applied Optics, 2000We describe a novel optical sensor based on the Faraday effect for measuring ac. The sensing element is a piece of material of high Verdet constant placed between polarizers. When the angle between the polarizers differs by 45 degrees, a signal of twice the frequency of the ac is generated--in addition to the usual signal with the same frequency as the
J A, Ferrari +4 more
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Harmonic saturated spectroscopy for improved atomic detection
Applied Optics, 1980A novel method for improved cw laser-induced atomic fluorescence detection that we call harmonic saturated spectroscopy takes advantage of the nonlinear response of an optically saturated atomic system to reject background sources of interference. A reduction in background and an improved SNR are demonstrated for sodium detection in an air-acetylene ...
R P, Frueholz, J A, Gelbwachs
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Age-related changes in detecting a mistuned harmonic
The Journal of the Acoustical Society of America, 2001The effects of age on discriminating simultaneous sounds were investigated by comparing the hearing threshold in detecting a mistuned harmonic in young, middle-aged, and older adults. The stimuli were complex sounds containing multiple harmonics, one of which could be “mistuned” so that it was no longer an integer multiple of the fundamental.
C, Alain +3 more
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An adaptive detecting method for harmonic and reactive currents
IEEE Transactions on Industrial Electronics, 1995The conventional detecting methods for power system harmonic and reactive currents have various limitations. Based on adaptive interference canceling theory, a new adaptive detecting method for harmonic and reactive currents is presented, the corresponding detection system is developed, and experiments are performed which verify the feasibility of the ...
Shiguo Luo, Zhencheng Hou
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Detection of harmonic burst signals
International Journal of Circuit Theory and Applications, 1985AbstractThe proposed procedure and the corresponding circuits for the recognition of a frequency from a set of possible input frequencies in the frame of a time‐window interval seem to be advantageous as they lead to simpler hardware than the well‐known energy detector. A unique feature is the single channel processing possibility.
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Frequency modulation spectroscopy with second harmonic detection
Applied Optics, 1985La demodulation du second harmonique permet d'obtenir un meilleur rapport signal sur bruit avec des lasers a largeur de raie relativement ...
G, Janik, C, Carlisle, T F, Gallagher
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Harmonic Change Detection for musical chords segmentation
2015 IEEE International Conference on Multimedia and Expo (ICME), 2015In this paper, different strategies for the calculation of the Harte's Harmonic Change Detection Function (HCDF) are discussed. HCDFs can be used for detecting chord boundaries for Automatic Chord Estimation (ACE) tasks, where the chord transitions are identified as peaks in the HCDF.
DEGANI, Alessio +3 more
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