Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 19605 for “"Frequency"”.
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Frequency Estimation Using Time-Frequency Based Methods
… of spectral parameters such as its amplitude, frequency, phase, and the variability of its instantaneous spectral components. The accuracy of these parameters depends on several processing variables such as resolution, noise level, and bias of the algorithm used. This thesis presents some …
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Data transmission by frequency-hopped multilevel frequency shift keying
Spread spectrum systems make use of radio frequency bandwidths which far exceed the minimum bandwidth necessary to transmit the basic message information.These systems are designed to provide satisfactory communication of the message information under difficult transmission conditions. …
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Pitch, loudness and frequency selectivity in low-frequency hearing loss
… and cochlear hydrops show fluctuating low-frequency hearing loss (FLFHL). At present these changes are followed as patients' subjective reports and occasional measurements. Consecutive long-term measurements should provide more comprehensive information on the hearing fluctuations than the …
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DISCRETE TRANSFORMS WITH GOOD TIME-FREQUENCY AND SPATIAL-FREQUENCY LOCALIZATION
<p>Discrete orthonormal time-frequency basis functions are described and used for both analysis and synthesis of complex-valued signals. We derive expressions for complex-valued expansion coefficients in time-frequency lattices in the discrete one dimensional case. This derivation is based on …
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Aspects of stepped-frequency processing for low-frequency SAR systems
… to investigate the following two aspects of low-frequency (VHF/UHF-band) SAR processing: 1. The use of stepped-frequency waveforms to increase the total radar bandwidth, thereby increasing the range resolution, and 2. Radio frequency interference (RFI) suppression. A stepped-frequency system owes …
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Low Frequency Biasing
Die Elektrocochleographie (EcoG) ist eine der vielversprechendsten Methoden, cochleäre Dysfunktionen mit objektiver Diagnostik zu verifizieren. Erweitert durch das Prinzip des Biasings, also der gleichzeitigen Präsentation von Testtönen in einen niederfrequenten 52-Hz-Sinusdauerton, läßt sich die …
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Frequency Multiplication Circuits
Made available in DSpace on 2014-12-04T21:03:11Z (GMT). No. of bitstreams: 1 6000242.pdf: 8347134 bytes, checksum: 7d350070c7b9afc32ad5e05aa2f55587 (MD5) Previous issue date: 1959
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Phononic Frequency Combs
Optical frequency combs have resulted in significant advances in optical frequency metrology and found wide application to precise physical measurements and molecular fingerprinting. A direct analogue of frequency combs in the phononic or acoustic domain has not been reported to date. This thesis …
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Polar frequency discriminators
This dissertation makes a study of frequency discriminators and their role in instantaneous frequency measuring (IFM) signal acquisition receivers. Frequency discriminators are the major building blocks of IFM. They are required to measure frequency accurately over very broad bandwidths and to have …
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Generalized frequency modulation
In frequency modulation (FM) systems, a continuous-time information signal is modulated onto a sinusoidal carrier wave by using the information signal to modulate the frequency of the carrier wave. In this thesis, a more general type of modulation is developed, of which FM is a special case, that …
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Radio frequency performance
Thesis (M.S.V.S.)--Massachusetts Institute of Technology, Dept. of Architecture, 1982.
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Powers scaling and nonlinear frequency conversion of single-frequency lasers based
… µm line whilst retaining, efficient, single-frequency, diffraction limited output, the characteristics of low power operation. This strategy reduces the effects of energy transfer up-conversion (ETU), which can decrease the lifetime of the upper lasing level and increase the heat generated …
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Supra-Characteristic-Frequency Response in Gerbil Auditory Nerve Frequency Tuning Curves
… at frequencies above an ANF's characteristic frequency (CF). We recorded ANF responses from the gerbil, concentrating on this supra-CF region. We observed a supra-CF plateau in ANF responses at high stimulus level, indicating that the plateau mode of BM motion can be excitatory. Quantitative …
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Frequency translation method for low frequency variable gain amplification and filtering
… innovative solution to an industry challenge. A frequency translation method is designed to shift low frequency signals to intermediate frequencies in order to utilize higher-frequency components. This solution, appropriate for applications involving 1-10MHz signals, can provide continuously …
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Multi-dimensional ultra-high frequency passive radio frequency identification tag antenna designs
… of two novel multi-dimensional ultra-high frequency (UHF) passive radio frequency identification (RFID) tag antennas, the Albano-Dipole antenna and the Albano-Patch antenna, that provide omnidirectional communication capabilities. The performance of a passive UHF RFID tag is highly …
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Exposure frequency and affect
… attitudinal affect is a monotonic function of frequency of exposure. In the first experiment while supporting the frequency-affect relationship a non significant difference between males and females and positive and negative set conditions were obtained. In the second experiment low association …
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High frequency surface estimation
Mountain generation can be considered a part of the general theory of surface estimation; In this thesis, two methods have been presented to generate fractals--fast Fourier method and a new generalized stochastic subdivision method. Also, a new surface estimation method has been introduced that …
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Children's Association Frequency Tables
University of Minnesota Masters thesis. 1917. Major: Psychology. 1 computer file (PDF); 110 pages.
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High Frequency Transmission Spectroscopy
High Frequency Transmission Spectroscopy is a novel technique for the characterization of a wide range of materials in a diverse set of problem domains. HFTS has potential implications for problem domains such as semiconductor manufacturing and counterfeit detection, disease/infection screening, …
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