نتایج جستجو برای: single frequency network
تعداد نتایج: 1889398 فیلتر نتایج به سال:
• It connects to a distribution network to receive from the head-end the content for transmission • It optionally performs program re-multiplexing according to location-specific requirements • It modulates the output signal in compliance with the broadcasting technology in question • In a Single Frequency Network (SFN), which requires tight signal timing coordination, it synchronizes its output...
In our previous paper, we investigated the effects of image noise on the perception of image sharpness using white noise, and oneand two-dimensional (1D and 2D, respectively) single-frequency sinusoidal patterns as stimuli. Our results showed that with high-frequency stimuli, sharpness decreased as noise level increased; whereas, with low-frequency stimuli, sharpness reached a maximum value at ...
Sensory experience can reorganize cortical sensory representations in an epoch of early development. During this period, cortical sensory neurons may shift their response selectivity and become tuned to more frequently occurring stimuli. Although this enlarged cortical representation is believed to underlie improved sensory processing of the experienced stimuli, its precise perceptual consequen...
A. Ozaeta,1 A. S. Vasenko,2 F. W. J. Hekking,3 and F. S. Bergeret1,4 1Centro de Fı́sica de Materiales (CFM-MPC), Centro Mixto CSIC-UPV/EHU, Manuel de Lardizabal 4, E-20018 San Sebastián, Spain 2Institut Laue-Langevin, 6 rue Jules Horowitz, BP 156, 38042 Grenoble, France 3LPMMC, Université Joseph Fourier and CNRS, 25 Avenue des Martyrs, BP 166, 38042 Grenoble, France 4Donostia International Physi...
In an open context such as the Semantic Web, information providers usually rely on different ontologies to semantically characterize contents. In order to enable interoperability at a semantic level, ontologies underlying information sources must be linked by discovering alignments, that is, set of correspondences or mappings. The aim of this paper is to provide a formal model (i.e., Semantic F...
We report the first demonstration to our knowledge of broadly tunable, single-frequency operation of a cw Cr:YAG laser. Single-frequency operation was obtained from 1332 to 1554 nm with a maximum output power of 680 mW generated at 1457 nm with 10% conversion efficiency of 1047-nm pump laser radiation. A traveling-wave ring resonator was forced to operate unidirectionally by use of Faraday rota...
We have constructed a broadband apparatus for wavelength metrology capable of absolute accuracy at a level of better than 2 parts in 109. An evacuated plane-parallel Fabry–Pérot interferometer with continuously adjustable mirror separation is used to compare the wavelength of a single-frequency tunable laser with that of an iodine-stabilized HeNe laser used as a wavelength standard. This work d...
This paper is devoted to the generation and evaluation of the Chaos-based M-ary spreading sequences on communications systems. Sequences obtained by repeating a truncated and multi-ary quantized chaotic series are compared with classical m-sequences by means of the autocorrelation and cross-correlation properties and power-spectral features. Anti-noise performance of binary sequences and chaoti...
The VIRGO injection system, designed to provide a stable single-frequency 20 W laser to the VIRGO interferometer, is under commissioning. All functions have been demonstrated to work close to requirements, and the integration of all of them is in progress.
This paper evaluates the effects of high-frequency uncertainty shocks on a set of lowfrequency macroeconomic variables representative of the U.S. economy. Rather than estimating models at the same common low-frequency, we use recently developed econometric models, which allows us to deal with data of different sampling frequencies. We find that credit and labor market variables react the most t...
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