Rozprawy doktorskie na temat „Magnitude spectrum”
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Stark, Anthony. "Phase Spectrum Based Speech Processing and Spectral Energy Estimation for Robust Speech Recognition". Thesis, Griffith University, 2011. http://hdl.handle.net/10072/366490.
Pełny tekst źródłaThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
Griffith School of Engineering
Science, Environment, Engineering and Technology
Full Text
Wojcicki, Kamil Krzysztof. "Role of the Short-Time Phase Spectrum in Speech Processing". Thesis, Griffith University, 2011. http://hdl.handle.net/10072/366376.
Pełny tekst źródłaThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
Griffith School of Engineering
Science, Environment, Engineering and Technology
Full Text
Alsteris, Leigh, i n/a. "Short-Time Phase Spectrum in Human and Automatic Speech Recognition". Griffith University. School of Microelectronic Engineering, 2006. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20060727.090845.
Pełny tekst źródłaAlsteris, Leigh. "Short-Time Phase Spectrum in Human and Automatic Speech Recognition". Thesis, Griffith University, 2006. http://hdl.handle.net/10072/366602.
Pełny tekst źródłaThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Microelectronic Engineering
Full Text
Cherniavskiy, I. Y., i V. A. Vinnikov. "The assessment of radiation hazardous areas considering the spectral analysis of the neutron component". Thesis, Національний технічний університет "Харківський політехнічний інститут", 2019. http://repository.kpi.kharkov.ua/handle/KhPI-Press/45079.
Pełny tekst źródłaDias, Bruno Moreira de Souza. "Aglomerados estelares da Pequena Nuvem de Magalhães". Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/14/14131/tde-08102010-151226/.
Pełny tekst źródłaAnalysis of age and metallicity of star clusters in Magellanic Clouds brings information to studies on the chemical evolution and dynamics of the Clouds. By using them as calibrators of single stellar populations models, this type of analysis is also useful for the study of other galaxies. One of the aims of this work is to derive ages and metallicities from integrated spectra of 14 clusters in the Small Magellanic Cloud. We seek for the understanding, in particular, of the intermediate/old age clusters. The method used for this purpose is based on full spectrum tting of integrated spectra of the clusters, comparing them to three sets of single stellar populations; two codes available in the literature are used to do such comparisons. Thus 9 clusters are identied as intermediate/old age clusters and 5 other as young ones. Noteworthy are the results for the clusters with intermediate/old age newly identied: HW 1, NGC 152, Lindsay 3, 11 and 113. We also conrm the old ages of NGC 361, 419 and Kron 3, and of the well-known oldest cluster of the Small Cloud, NGC 121. Another aim is to determine self-consistent physical parameters (age, metallicity, distance and reddening) for 7 relatively unstudied stellar clusters in the Small Magellanic Cloud, with ages between 0.5 and 5 Gyr. We use statistical tools to compare synthetic and observed CMDs. Dierently of a visual isochrone t, this approach oers ob jective and unambiguous criteria to establish which are the synthetic CMDs that best ts the observed CMD. Preliminary results show the eciency of this method, which determines log(age), with an uncertainty of 0.10 and [Fe/H], with 0.20. This can introduce new and important constraints in the age-metallicity relation for the Small Cloud, which is signicantly more complex and less studied than the one of the Large Magellanic Cloud.
Sestok, Charles K. (Charles Kasimer). "Speech enhancement with spectral magnitude side information". Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/80117.
Pełny tekst źródłaIncludes bibliographical references (p. 43-44).
by Charles Kasimer Sestok, IV.
S.M.
ITAKURA, Fumitada, Kazuya TAKEDA i Tran Huy DAT. "Gamma Modeling of Speech Power and Its On-Line Estimation for Statistical Speech Enhancement". Institute of Electronics, Information and Communication Engineers, 2006. http://hdl.handle.net/2237/15052.
Pełny tekst źródłaVowels, Matthew James. "THE APPLICATION OF SPECTRAL AND CROSS-SPECTRAL ANALYSIS TO SOCIAL SCIENCES DATA". UKnowledge, 2018. https://uknowledge.uky.edu/hes_etds/58.
Pełny tekst źródłaBeresford, Kathryn. "Perceptual effects of spectral magnitude distortions in a multi-channel automotive audio environment". Thesis, University of Surrey, 2010. http://epubs.surrey.ac.uk/2189/.
Pełny tekst źródłaDat, Tran Huy, Kazuya Takeda i Fumitada Itakura. "MULTICHANNEL SPEECH ENHANCEMENT BASED ON SPEECH SPECTRAL MAGNITUDE ESTIMATION USING GENERALIZED GAMMA PRIOR DISTRIBUTION". IEEE, 2006. http://hdl.handle.net/2237/9445.
Pełny tekst źródłaGonzález-Caneda, María. "Investigation Of Source Parameters Of Earthquakes In Northern Sweden". Thesis, Uppsala universitet, Geofysik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-380133.
Pełny tekst źródłaCho, Yong Duk. "Speech detection, enhancement and compression for voice communications". Thesis, University of Surrey, 2001. http://epubs.surrey.ac.uk/842991/.
Pełny tekst źródłaLee, Judy Pihsien. "Apodization of absorption and magnitude mode fourier transform spectra and the effects on SNR and resolution". Thesis, University of British Columbia, 1986. http://hdl.handle.net/2429/25918.
Pełny tekst źródłaScience, Faculty of
Chemistry, Department of
Graduate
Povalač, Karel. "Sledování spektra a optimalizace systémů s více nosnými pro kognitivní rádio". Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-233577.
Pełny tekst źródłaGomes, Jean-Thomas. "Mise en place de processus de génération de somme de fréquences optiques large bande dediés à l'imagerie haute résolution pour l'astronomie". Limoges, 2013. https://aurore.unilim.fr/theses/nxfile/default/d7f4b140-9282-4d2e-ad20-b07c795d3a78/blobholder:0/2013LIMO4012.pdf.
Pełny tekst źródłaStellar interferometers dedicated to high angular resolution imaging are powerful instruments that allow an extensive study of our Universe. This thesis describes a new instrument, called sum frequency generation interferometer, dedicated to the spatio-temporal coherence analysis of infrared radiations in the visible domain around 630nm thanks to frequency shift processes. This frequency shift is achieved through a sum frequency generation process, supplied by a laser source at 1064 nm, in the PPLN crystals placed on each arm of the interferometer. The first part of this thesis provides the theoretical elements needed for the understanding of the present work. The second part concerns the design, the realization and the characterization of a sum frequency generation interferometer suitable for the analysis of broadband infrared sources. The third part presents the experimental temporal coherence analysis of such a source. It ends by the experimental demonstration of the spatial coherence analysis of an artificial thermal source in the photon counting regime. The last part deals with the possibility to extend the spectral bandwidth of the interferometer and shows the appearance of a frequency spectral compression effect through the PPLN crystals. It concludes with the proposed implementation of a sum frequency generation interferometer on the CHARA telescope array and provides an estimation of the limiting magnitude reached by combining this instrument to different configurations of the interferometer
Rodesten, Stephan. "Program för frekvensanalys". Thesis, Örebro universitet, Institutionen för naturvetenskap och teknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-58157.
Pełny tekst źródłaThis report will cover the work process behind creating a spectrum analyzer. The reader will be able to read about the chosen method but also the alternative methods. Apart from this the theoretical parts behind every moment will also be covered and compared to potential alternative solutions. The project has been carried out on behalf of KA Automation. The purpose of the project was to create a base for analyzing sound frequencies. The goal was to be able to identify sound properties in the form of frequencies in servo motors in for example water pumps. The idea was to be able to in a later development stage be able to identify when new frequencies have entered the audio profile which might result in the motor to be in need of service. The base is created with the help of C# and the sound library NAudio. From the result one can conclude that this program can analyze sound and display the magnitude of its frequency components and is therefore a suitable base for future development.
Neužil, Jan. "Uživatelské rozhraní pro HP89410A". Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-217775.
Pełny tekst źródłaIenna, Florence. "Evolution des propriétés globales des galaxies dans le Canada-France-Hawaii telescope legacy survey". Toulouse 3, 2007. http://thesesups.ups-tlse.fr/68/.
Pełny tekst źródłaIn order to understand the evolution of the big structures in the Univers and the physical mecanisms implicated, we need to observe the caracteristics of galaxies at different redshift in the past. Thanks to progress in instrumentation technics made in the last ten years, the community has realised wide and deep observation programs, at different wavelenghts. One of them, realised at the CFHT, is both the widest and deepest achieved until now and has been studied in this thesis: the CFHTLS Deep. We have selected complete samples of galaxies at different redshift bin up to z~1. 2 in the CFHTLS Deep catalogs. We hace computed photometric redshifts for every galaxies with the code Hyperz, and their absolute magnitude in the five filters (u*g'r'i'z'). Thus, we have been able to study the evolution of the color-magnitude relations of our samples. We have also studied the role of environment on the galaxies properties thanks to a projected local density estimator calculated for every galaxies in the CFHTLS Deep four fields. We have shown that the color distribution of galaxies is bimodal in every magnitude and redshift bins studied. We have observed a strong evolution of the color distribution with redshift and luminosity, together with a midl evolution with local density. The color-magnitude-environment relations of the galaxies populations observed in local Univers were already built at z~0. 6. Galaxies were significantly bluer in the past and almost 50% of the bright red population were already built at z~1. 2, which indicates an early epoch of assembly. Beyond z~0. 8, an important blue and bright population appears. .
McKinley, Michael Dean. "Improved frequency domain measurement techniques for characterizing power amplifier and multipath environments". Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/24722.
Pełny tekst źródłaCommittee Chair: James Stevenson Kenney; Committee Member: Gregory David Durgin; Committee Member: Madhavan Swaminathan
Tran, Thi-Anh-Xuan. "Acoustic gesture modeling. Application to a Vietnamese speech recognition system". Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAT023/document.
Pełny tekst źródłaSpeech plays a vital role in human communication. Selection of relevant acoustic speech features is key to in the design of any system using speech processing. For some 40 years, speech was typically considered as a sequence of quasi-stable portions of signal (vowels) separated by transitions (consonants). Despite a wealth of studies that clearly document the importance of coarticulation, and reveal that articulatory and acoustic targets are not context-independent, the view that each vowel has an acoustic target that can be specified in a context-independent manner remains widespread. This point of view entails strong limitations. It is well known that formant frequencies are acoustic characteristics that bear a clear relationship with speech production, and that can distinguish among vowels. Therefore, vowels are generally described with static articulatory configurations represented by targets in the acoustic space, typically by formant frequencies in F1-F2 and F2-F3 planes. Plosive consonants can be described in terms of places of articulation, represented by locus or locus equations in an acoustic plane. But formant frequencies trajectories in fluent speech rarely display a steady state for each vowel. They vary with speaker, consonantal environment (co-articulation) and speaking rate (relating to continuum between hypo- and hyper-articulation). In view of inherent limitations of static approaches, the approach adopted here consists in studying both vowels and consonants from a dynamic point of view.Firstly we studied the effects of the impulse response at the beginning, at the end and during transitions of the signal both in the speech signal and at the perception level. Variations of the phases of the components were then examined. Results show that the effects of these parameters can be observed in spectrograms. Crucially, the amplitudes of the spectral components distinguished under the approach advocated here are sufficient for perceptual discrimination. From this result, for all speech analysis, we only focus on amplitude domain, deliberately leaving aside phase information. Next we extent the work to vowel-consonant-vowel perception from a dynamic point of view. These perceptual results, together with those obtained earlier by Carré (2009a), show that vowel-to-vowel and vowel-consonant-vowel stimuli can be characterized and separated by the direction and rate of the transitions on formant plane, even when absolute frequency values are outside the vowel triangle (i.e. the vowel acoustic space in absolute values).Due to limitations of formant measurements, the dynamic approach needs to develop new tools, based on parameters that can replace formant frequency estimation. Spectral Subband Centroid Frequency (SSCF) features was studied. Comparison with vowel formant frequencies show that SSCFs can replace formant frequencies and act as “pseudo-formant” even during consonant production.On this basis, SSCF is used as a tool to compute dynamic characteristics. We propose a new way to model the dynamic speech features: we called it SSCF Angles. Our analysis work on SSCF Angles were performed on transitions of vowel-to-vowel (V1V2) sequences of both Vietnamese and French. SSCF Angles appear as reliable and robust parameters. For each language, the analysis results show that: (i) SSCF Angles can distinguish V1V2 transitions; (ii) V1V2 and V2V1 have symmetrical properties on the acoustic domain based on SSCF Angles; (iii) SSCF Angles for male and female are fairly similar in the same studied transition of context V1V2; and (iv) they are also more or less invariant for speech rate (normal speech rate and fast one). And finally, these dynamic acoustic speech features are used in Vietnamese automatic speech recognition system with several obtained interesting results
Kao, Shih-Je, i 高士喆. "Speech Enhancement Using Perceptually Motivated Bayesian Estimators of the Magnitude Spectrum". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/55ht3m.
Pełny tekst źródła國立臺北科技大學
電機工程系研究所
102
Speech signals are tend to decrease the speech quality when corrupted by background noises. The main purpose of speech enhancement systems is to reduce the background noise from a noisy speech signal by using both noise estimation algorithm and speech enhancement algorithm, such that produce an enhanced speech signal that has a relatively low speech distortion. In this thesis, we develop two speech enhancement algorithms based on perceptually motivated estimators of the magnitude spectrum together with three noise estimation algorithms. Speech enhancement algorithms include Weighted Euclidean (WE) and Weighted Hyperbolic Cosine (WCOSH). Noise estimation algorithms include Minimum Statistics (MS), Minima Controlled Recursive Averaging (MCRA), and Improved Minima Controlled Recursive Averaging (IMCRA). The experimental results show that compared with the Wiener filter and Minimum Mean-Square Error (MMSE), the perceptually motivated estimators provide better SSNRI, SDI and NRF scores. Among all, the Weighed Cosh method incorporated with MCRA achieves the most significant enhancement performance.
Chen, Bin. "Speech enhancement using a laplacian-based MMSE estimator of the magnitude spectrum /". 2005. http://proquest.umi.com/pqdweb?did=1421602231&sid=1&Fmt=2&clientId=10361&RQT=309&VName=PQD.
Pełny tekst źródłaTu, Feng-Shan, i 涂鳳珊. "Earthquake Magnitudes Based on Coda-Derived Source Spectra in Taiwan". Thesis, 2011. http://ndltd.ncl.edu.tw/handle/55114757034282242900.
Pełny tekst źródła國立臺灣大學
地質科學研究所
99
We apply the coda-derived source spectrum method to estimate earthquake magnitudes in Taiwan. 76 events occurred during the time period from 1996 to 2010 around west-south Taiwan recorded by BATS (Broadband Array in Taiwan for Seismology) with magnitudes between Mw 3.2 and 6.21 are used in this study. From two horizontal components of waveform data, we extract the coda envelopes at 12 frequency bands between 0.05 and 8.0 Hz. We construct the synthetic coda-envelope by using various empirical distance-frequency-dependent corrections. The derived synthetic coda envelops are compared to the observed coda-envelope to evaluate the dimensionless coda amplitudes. With further considerations on path effects, site effects and source-to-coda transfer functions, the dimensionless coda amplitudes at each frequency band are used to construct the source spectra, which is then used to determine the earthquake magnitudes. The 76 derived coda-magnitudes (MC) are consistent with corresponding moment magnitudes (Mw). Our result also shows the overall deviations between MC and local magnitude (ML) reported from Central Weather Bureau are less than those between Mw and ML. While the implications need further investigation, the results indicate that the broad-band coda information does reconcile, to some extent, the long-lasting discrepancy between the low frequency magnitude (Mw) and the high frequency magnitude (ML) in Taiwan. Moreover, we found out that there is a very stable linear relationship between coda-derived source amplitudes at 2.5 Hz and the ML scale, implying that the source information is well maintained by the high-frequency coda, and this property shows it is potentially very feasible to extend this method to smaller earthquakes in Taiwan.
Lai, Tz-Shin, i 賴姿心. "A Study of Site Effect on Station Corrections of Magnitude and Measurement of the Spectral Decay Parameter Kappa Using Borehole Seismic Array Data". Thesis, 2015. http://ndltd.ncl.edu.tw/handle/3mdppr.
Pełny tekst źródła國立臺灣大學
地質科學研究所
103
Seismic stations including the Broadband Array in Taiwan for Seismology (BATS) were incorporated within the Central Weather Bureau Seismic Network (CWBSN) since 2012. However, site effects of seismic stations have not been applied for M_L determination that it may affect the magnitude estimation. Moreover, the appearance of relatively low seismicity is observed in 2012 from monthly event counts for〖 M〗_L >2.0. Thus, we would like to examine whether there is a relationship between the updated seismic network and low seismicity or not. In this study, we first collect the earthquake catalog data during the period from 1994/01/01 to 2012/12/31 to calculate the station correction in order to reduce site effect in estimating magnitude. There is a strong correlation between station correction and near-surface geology beneath the station. Stations located on soil sites have high amplifications with negative station corrections. In contrast, stations located on hard rock sites have low amplifications with positive station corrections. After applied the station corrections to revise〖 M〗_L estimation, the monthly event-occurrence rates return inside the range of one standard deviation in 2012 and revealed no low or high anomaly. Therefore, the reason low seismicity in 2012 is that new seismic stations which are installed on rock sites lead to underestimate of the magnitude determination. Next, we investigate the spectral decay parameter kappa (κ) to get more information for site effects of seismic stations. We used 133 earthquakes recorded by 30 borehole seismic array deployed by Central Weather Bureau (CWB) to estimate the κ value. Each vertical array includes two force balance accelerometers at the surface and the borehole. Based on the regression analysis between κ value and hypocentral distance for each surface-borehole station pairs, most of resulting κ0 derived from surface stations are higher than results of borehole stations. These valuable dataset of κ0 values offer an excellent opportunity for us to evaluate the quality factor (Qs) at shallow depths. In comparison with a study of site corrections, these higher κ0 values associated with negative station corrections can correspond to effect of soil conditions. In order to determine the linear relationship between station corrections and κ0 values, we find the co-site stations of TSMIP and CWBSN to estimate κ0 and the regression line. In this study, the station corrections of magnitude and κ0 values both can investigate the site effects beneath the stations. Furthermore, the regression line of these two can be the information for the estimation of earthquake magnitude including borehole stations in the future.
BROM, Jiří. "Matematické metody a úlohy v astronomii". Master's thesis, 2016. http://www.nusl.cz/ntk/nusl-202658.
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