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Analyse des signaux multicomposante à modulation de fréquence linéaire par la transformation de Teager-Huang-Hough
Full text linkA novel detection approach of linear FM (LFM) signals, with single or multiple components, in the time-frequency plane of Teager-Huang (TH) transform is presented. The detection scheme that combines TH transform and Hough transform is referred to as Teager-Huang-Hough (THH) transform. The input signal is mapped into the time-frequency plane by using TH transform followed by the application of Hough transform to recognize time-frequency components. LFM components are detected and their parameters are estimated from peaks and their locations in the Hough space. Advantages of THH transform over Hough transform of Wigner-Ville distribution (WVD) are: 1) cross-terms free detection and estimation, and 2) good time and frequency resolutions. No assumptions are made about the number of components of the LFM signals and their models. THH transform is illustrated on multicomponent LFM signals in free and noisy environments and the results compared with WVD-Hough and pseudo-WVD-Hough transforms
Tunable single and multiwavelength continuous-wave c-cut Nd:YVO <sub>4</sub> laser
No full textWe report a discretely tunable, single and multiwavelength continuous-wave diode-end-pumped laser with a c-cut Nd:YVO 4 crystal lasing on the 4F 3/2- 4I 11/2 intermanifold transitions and an intracavity sub-THz free-spectral-range etalon. Experimental results show that it is tunable in the discrete regions of 1066.5-1066.8, 1083.1-1084.6, and 1087.2-1088.2 nm and operates simultaneously at dual-wavelengths of (1084.6, 1087.4), (1066.5, 1088.0), (1066.8, 1083.3) nm by changing the angle of an intracavity etalon with 0.67 THz free-spectral range. With a proper etalon angle, the laser can also simultaneously oscillate at four wavelengths of 1066.9, 1082.9, 1085.7, and 1088.3 nm with a total output power of 1.2 W at an incident diode pump power of 15 W. Similar performance of the laser at different wavelengths was also achieved by using a 0.88 THz free-spectral-range etalon in the same laser cavity.</p
More on Soft Theorems: Trees, Loops and Strings
Full text linkThe work of S. H. is
supported by Zurich Financial Services Membership and
the Ambrose Monell Foundation. The work of Y.-t. H. is
supported by the National Science Foundation Grant
No. PHY-1314311 and MOST Grant No. 103-2112-M002-025-MY3.
The work of C. W. is supported by the
Science and Technology Facilities Council Consolidated
Grant No. ST/J000469/1, “String theory, gauge theory and
duality.” The work of M. B. is partially supported by the
ERC Advanced Grant No. 226455, “Superfields
Are personality adjectives categorized along the Chinese Big Seven dimensions? An examination from the retrieval-induced
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Properties of pseudomode surface acoustic waves on ST-cut quartz substrates and the effects of the thicknesses of metallic films
No full textThe Benefits of Psychological Displacement in Diary-Writing When Using Different Pronouns. British Journal of Health Psychology.
No full textDevelopment and comparison of three detection methods for calla lily-infecting Dasheen mosaic virus
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