Gotowe bibliografie tematyczne / Phase spectrum

Gotowa bibliografia na temat „Phase spectrum”

Autor: Grafiati
Data publikacji: 4 czerwca 2021
Data aktualizacji: 6 września 2023

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Artykuły w czasopismach na temat "Phase spectrum"

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He, Wei, De Tian i Wei Long Wang. "Effect of Wind Shear on Rotational Fourier Spectrum of Wind Turbine". Applied Mechanics and Materials 271-272 (grudzień 2012): 872–76. http://dx.doi.org/10.4028/www.scientific.net/amm.271-272.872.

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In order to accurately obtain the influence of rotational effect on fluctuating component of turbulent wind acted on wind turbine, considering source spectrum and rotational sample points were changed since wind shear changed mean wind speed in the rotor plane along the vertical direction, rotational Fourier spectrum with wind shear was deduced. Based on the investigation on a 3MW three-bladed pitch regulated wind turbine, rotational Fourier spectrums with and without wind shear were compared, the effect of radius on rotational Fourier spectrum was analyzed, cross power spectral densities of rotational Fourier spectrum with different blades and variable radius were compared. The results show that the effect of wind shear on amplitude of rotational Fourier spectrum is unconspicuous while the phase frequency characteristic is alternative for the sample points are changed. Rotational Fourier spectrum energy removes to the high frequency bands, the amplitudes of peak at the integer multiple rotational frequencies increase with radius increases. The initial phase has little influence to the amplitude of spectrum, and cross power spectral densities of different radius are obviously less than auto power spectral densities of the same radius.
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Huang, Xiang-dong, i Zhao-hua Wang. "Phase Difference Correcting Spectrum Method Based on All-phase Spectrum Analysis". Journal of Electronics & Information Technology 30, nr 2 (22.02.2011): 293–97. http://dx.doi.org/10.3724/sp.j.1146.2006.00804.

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Dwivedi, Vatsal, i Victor Chua. "Phase space entanglement spectrum". Journal of Physics A: Mathematical and Theoretical 51, nr 31 (28.06.2018): 315304. http://dx.doi.org/10.1088/1751-8121/aacc4d.

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He, Wei, De Tian, Qi Li i Ning Bo Wang. "Rotational Turbulent Wind Field Simulation of Wind Turbine". Applied Mechanics and Materials 291-294 (luty 2013): 472–76. http://dx.doi.org/10.4028/www.scientific.net/amm.291-294.472.

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In order to accurately obtain the influence of rotational effect on fluctuating component of turbulent wind acted on wind turbine, rotational Fourier spectrum with considering rotational effect of rotor was deduced. Physical nature of the rotational Fourier spectrum embodied by coherence function and phase lag was indicated. Auto power spectral density and cross power spectral density of rotational Fourier spectrum with introducing phase lag were proposed. The spectrum matrix constructed by the module of rotational Fourier spectrum was decomposed with Cholesky's method, according to the spectrum representation method with introducing phase lag, the random turbulent wind speed field was generated by superposing a set of cosine functions. Finally, an example involving simulation of the longitudinal turbulent wind velocity time series of a 1.5 MW three-bladed pitch regulated wind turbine was investigated. The target spectrum and simulated spectrum were compared. The result shows that the proposed algorithm is more accurate to simulate the fluctuating wind velocity of rotational blade.
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Dainty, Anton M., i David B. Harris. "Phase velocity estimation of diffusely scattered waves". Bulletin of the Seismological Society of America 79, nr 4 (1.08.1989): 1231–50. http://dx.doi.org/10.1785/bssa0790041231.

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Abstract Two methods are investigated for estimating the phase velocity of diffusely scattered seismic waves simultaneously arriving from different azimuths and recorded by a two-dimensional array of seismometers. The Hankel spectrum is the average of the frequency-wavenumber (FK) spectrum over all azimuths, while the wavenumber spectrum is derived by integrating the FK spectrum around a contour of constant phase velocity, i.e., a circle centered on the origin in the wavenumber plane. If the conventional estimate of the FK spectrum using the covariance matrix of the seismometer signals is integrated, a closed form for both the Hankel spectrum and the wavenumber spectrum may be found; the two spectra are very similar, the wavenumber spectrum being equal to the Hankel spectrum times the wavenumber. In spite of this similarity, however, we find that the two formulations have significantly different behavior for small wavenumbers, i.e., high phase velocities. In both cases there is a highest (true) velocity that can be estimated from the spectral maximum for a given array aperture (“velocity cut-off”). The Hankel spectrum estimates too high a velocity; for true wavenumbers below a certain limit, infinite velocity is estimated. The wavenumber spectrum, on the other hand, estimates too low a velocity, and there is an upper limit on the estimated velocity. An example illustrating these difficulties for the two methods is given for teleseismic P coda of an event recorded at the NORESS array in southern Norway: in spite of the problems, the analysis is able to demonstrate that the coda consists of two components; a coherent P-wave component with a high phase velocity and a diffuse S-wave component of low phase velocity. The cut-off and bias problem are investigated by numerical simulation for the NORESS array using azimuthal averaging and synthetic signals. The results confirm and quantify the cut-off problem at low wavenumbers and indicate that wavenumbers estimated from the Hankel and wavenumber spectra maxima bracket the true wavenumber, with the Hankel spectrum estimate being low (phase velocity too high) and the wavenumber spectrum estimate high. The bias of both methods decreases with increasing wavenumber (decreasing phase velocity) and they are both asymptotically unbiased. The wavenumber spectrum has a superior performance at low wavenumbers (high phase velocity), but the Hankel spectrum gives superior results at high wavenumbers (low phase velocity). The product of the linear wavenumber (= 1/wavelength) and the array aperture define “high” and “low” wavenumbers; for low wavenumbers, the product is 1 or less. In an Appendix, we find absolute lower bounds on the cut-offs analytically. The problems could be mitigated by using high resolution methods.
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Hutson, M. Shane, i Mark S. Braiman. "Direct Phase Correction of Differential FT-IR Spectra". Applied Spectroscopy 52, nr 7 (lipiec 1998): 974–84. http://dx.doi.org/10.1366/0003702981944616.

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Step-scan transient Fourier transform infrared (FT-IR) difference spectra are often measured in an ac-coupled configuration. The resulting differential intensity spectra contain both positive and negative bands. This condition poses problems for direct phase correction by the standard Mertz and Forman methods. Restricting the calculated phase angle to the range [–π/2, π/2] was previously shown to fix some of these problems, but we show that the use of a reduced-resolution phase spectrum can produce other artifacts. The effect of reduced resolution is analyzed for a simulated noise-free spectrum and for a measured transient spectrum of a real photochemical system, bacteriorhodopsin. Examination of these results reveals that the Mertz and Mertz Signed methods can produce spectral bands of reduced magnitude and unusual band shape, with considerable amounts of intensity remaining along the imaginary axis after phase correction. However, these errors can be eliminated by self-convolution of the measured interferogram, which doubles all phase angles, prior to smoothing. This procedure removes the potential discontinuities in the phase angle due to sign changes in the differential spectrum. With bacteriorhodopsin, this doubled-angle method for direct phase correction is able to produce a transient spectrum which closely matches that produced by using a separately measured dc interferogram to calculate the phase angle.
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Mohamad, Eizuddin, i Nor Hayati Saad. "Ergonomics Intervention in Indoor Spectrum Measurement Activities". Applied Mechanics and Materials 899 (czerwiec 2020): 230–37. http://dx.doi.org/10.4028/www.scientific.net/amm.899.230.

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Engineers in the communication and multimedia industries in Malaysia exposed to the risk factors of work-related musculoskeletal disorders. A comprehensive study was conducted to perform ergonomic studies for indoor spectrum measurement activity to improve productivity and occupational safety and health. The study consisted of two phases, where the participative assessments and direct observations were conducted on 17 engineers. In the first phase, the indoor spectrum measurement problem identification was performed by using the portable and handheld spectrum analyser. The questionnaire, body part assessments and archival operation records were investigated. In the second phase, the ergonomics intervention was introduced with a low-cost trolley that removed the work-related musculoskeletal disorders from the engineers. The same test subject, environments, work procedures and evaluation method in phase one were repeated in phase two. The analysis was done by comparing the findings between both phases through statistical analysis, and the significant improvements of ergonomic interventions were identified. The outcome of the study concluded that the analysis and results meet the main objective.
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Robertson, R. M., J. A. de Haseth i R. F. Browner. "MAGIC-LC/FT-IR Spectrometry with Buffered Solvent Systems". Applied Spectroscopy 44, nr 1 (styczeń 1990): 8–13. http://dx.doi.org/10.1366/0003702904085886.

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The first demonstration of identifiable infrared (IR) spectra obtained from buffered (volatile and nonvolatile buffers) mobile phases using the Monodisperse Aerosol Generator Interface for Combining Liquid Chromatography with Fourier Transform Infrared (MAGIC-LC/FT-IR) spectrometry is described. Ammonium acetate, a volatile buffer, was used to buffer an 80:20 acetonitrile: water mobile phase to pH 5.0. Caffeine was deposited from this buffered mobile phase, and the spectrum was used as a reference to compare with caffeine spectra obtained from nonvolatile buffered mobile phases. The two nonvolatile buffers used were potassium hydrogen phthalate (KHP) and potassium dihydrogen phosphate (KH2PO4). The KH2PO4 was used to buffer an acetonitrile:water mobile phase and a methanol:water mobile phase, whereas the KHP buffer was used only in a methanoh:water mobile phase. Samples of caffeine were deposited from each of the above buffer systems along with the nonvolatile buffer. Infrared spectra of caffeine were obtained by spectral subtraction of previously stored buffer spectra from the caffeine:buffer spectra. The resulting spectra were identical to a caffeine reference spectrum.
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Sagara, Takamasa, Hidekazu Murase, Masaharu Komatsu i Naotoshi Nakashima. "Toward the Interpretation of Electroreflectance Spectral Profiles: Hemin Adsorbed on an HOPG Electrode Revisited". Applied Spectroscopy 54, nr 2 (luty 2000): 316–23. http://dx.doi.org/10.1366/0003702001949285.

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The features of the potential-modulated UV-visible reflectance (electroreflectance) spectrum at an electrode/solution interface are discussed by comparing experimental and simulated spectra. At a basal plane of a highly oriented pyrolytic graphite (HOPG) electrode covered with a molecular layer of hemin in 0.1 M Na2B4O7 aqueous solution, the electroreflectance signal was confirmed to be proportional to the amount of adsorbed hemin interconverted between oxidized and reduced forms. The electroreflectance spectrum in response to p-polarized incident light depended little on the incident angle, and the spectral profile was different from the difference absorption spectrum between oxidized and reduced hemin in solution phase. The spectral feature of the simulated electroreflectance spectrum with the use of Fresnel equations for a stratified three-phase optical model with a thin-layer approximation was markedly different from the experimental spectrum in regard to spectral profile and incident angle dependence. These results may suggest that refinement of the optical model to predict the reflectance spectrum at an electrode surface covered with a molecular layer is necessary for the interpretation of electroreflectance spectral profiles.
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HUANG, YUNXIA, SHUWU XU i XIAOHUA YANG. "HIGH-RESOLUTION PHOTOELECTRON SPECTROSCOPY BY SPECTRAL PHASE STEP MODULATION". Journal of Nonlinear Optical Physics & Materials 22, nr 04 (grudzień 2013): 1350045. http://dx.doi.org/10.1142/s0218863513500458.

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Femtosecond-induced resonance-enhanced multi-photon ionization photoelectron spectroscopy (REMPI-PES) has the drawback of low spectral resolution due to broadband spectrum of the laser. In this paper, we theoretically demonstrate that high-resolution REMPI-PES can be achieved by shaping the femtosecond laser pulse with spectral phase step modulation. Our results show that, by manipulating the phase step position and the modulation depth, a narrowband peak or hole in the photoelectron spectrum can be observed, and the position of the narrowband peak or hole is correlated with the eigenenergy of the excite state. Therefore, both high-resolution REMPI-PES and the excited state structure can be obtained by observing the narrowband peaks or holes.
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Rozprawy doktorskie na temat "Phase 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.

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Speech is the dominant mode of communication between humans; simple to learn, easy to use and integral for modern life. Given the importance of speech, development of a human-machine speech interface has been greatly anticipated. This challenging task is encapsulated in the digital speech processing research field. In this dissertation, two specific areas of research are considered: 1) the use of short-time Fourier spectral phase in digital speech processing and 2) use of the minimum mean square error spectral energy estimator for environment-robust automatic speech recognition. In speech processing and modelling, the short-time Fourier spectral phase has been considered of minor importance. This is because classic psychoacoustic experiments have shown speech intelligibility to be closely related to short-time Fourier spectral magnitude. Given this result, it is unsurprising that the majority of speech processing literature has involved exploitation of the short-time magnitude spectrum. Despite this, recent studies have shown useful information can be extracted from the spectral phase of speech. As a result, it is now known that spectral phase possesses much of the same intelligibility information as spectral magnitude. It is this avenue of research that is explored in greater detail within this dissertation. In particular, we investigate two phase derived quantities – the short-time instantaneous frequency spectrum and the short-time group delay spectrum. The properties of both spectra are investigated mathematically and empirically, identifying the relationship between known speech features and the underlying phase spectrum. We continue the investigation by examining two related quantities – the instantaneous frequency deviation and the group delay deviation. As a result of this research, two novel phase-based spectral representations are proposed, both of which show a high degree information applicable to speech processing.
Thesis (PhD Doctorate)
Doctor of Philosophy (PhD)
Griffith School of Engineering
Science, Environment, Engineering and Technology
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Cesbron, Fred́eŕique Chantal. "Pitch detection using the short-term phase spectrum". Thesis, Georgia Institute of Technology, 1992. http://hdl.handle.net/1853/15503.

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Fletcher, Michael John. "Enhanced Implementations for Arbitrary-Phase Spread Spectrum Waveforms". Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/90286.

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The use of practically non-repeating spreading codes to generate sequence-based spread spectrum waveforms is a strong method to improve transmission security, by limiting an observers opportunity to cross-correlate snapshots of the signal into a coherent gain. Such time-varying codes, particularly when used to define multi-bit resolution arbitrary-phase waveforms, also present significant challenges to the intended receiver, which must synchronize correlator processing to match the code every time it changes. High-order phase shift keying (PSK) spread modulations do, however, provide an overall whiter spectral response than legacy direct sequence spread spectrum (DSSS) signals. Further, the unique ability to color the output signal spectrum offers new advantages to optimize transmission in a non-white frequency channel and to mitigate observed interference. In high data rate applications, the opportunity to inject a time-aligned co-channel underlay-based watermark for authentication at the receiver is an effective method to enhance physical layer (PHY) security for virtually any primary network waveform. This thesis presents a series of options to enhance the implementation of arbitrary-phase chaotic sequence-based spread spectrum waveforms, including techniques to significantly reduce fallthrough correlator hardware resources in low-power sensing devices for only minor performance loss, capabilities for programming chosen frequency domain spectra into the resulting spread spectrum signal, and design considerations for underlay watermark-based PHY-layer firewalls. A number of hardware validated prototypes were built on an Intel Arria 10 SoC FPGA to provide measurable results, achieving substantial computational resource gains and implementation flexibility.
Master of Science
This thesis presents a series of options for enhancing the implementation of arbitrary-phase spread spectrum waveforms, a highly-secure class of wireless technologies, in order to reduce design complexity with minimal loss, provide methods for real-time performance adaptations, and extend the traditional application space for increased security of communications in other networks. A number of enhanced hardware prototypes were implemented to provide measurable results, achieving substantial computational resource gains and design flexibility. Given the computational resources and power constraints of devices in the Internet of Things (IoT), the signal detection loss of 2.10 dB for reducing the hardware logic utilization of the brute force fallthrough correlator by more than 76% (and eliminating the need to dedicate computationally-expensive embedded multipliers) is a very reasonable trade. While the waveform is fundamentally designed for increased security, adapting to widespread and/or commercial use may allow some sacrifice of the signal’s ability to avoid interception/detection to improve performance in undesirable operating conditions. In a similar, yet reversed, case, injecting a watermarking signature at the physical layer (PHY) of less-secure wireless technologies for receiver-side authentication also proves to be beneficial.
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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.

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Incorporating information from the short-time phase spectrum into a feature set for automatic speech recognition (ASR) may possibly serve to improve recognition accuracy. Currently, however, it is common practice to discard this information in favour of features that are derived purely from the short-time magnitude spectrum. There are two reasons for this: 1) the results of some well-known human listening experiments have indicated that the short-time phase spectrum conveys a negligible amount of intelligibility at the small window durations of 20-40 ms used for ASR spectral analysis, and 2) using the short-time phase spectrum directly for ASR has proven di?cult from a signal processing viewpoint, due to phase-wrapping and other problems. In this thesis, we explore the possibility of using short-time phase spectrum information for ASR by considering the two points mentioned above. To address the ?rst point, we conduct our own set of human listening experiments. Contrary to previous studies, our results indicate that the short-time phase spectrum can indeed contribute signi?cantly to speech intelligibility over small window durations of 20-40 ms. Also, the results of these listening experiments, in addition to some ASR experiments, indicate that at least part of this intelligibility may be supplementary to that provided by the short-time magnitude spectrum. To address the second point (i.e., the signal processing di?culties), it may be necessary to transform the short-time phase spectrum into a more physically meaningful representation from which useful features could possibly be extracted. Speci?cally, we investigate the frequency-derivative (or group delay function, GDF) and the time-derivative (or instantaneous frequency distribution, IFD) as potential candidates for this intermediate representation. We have performed various experiments which show that the GDF and IFD may be useful for ASR. We conduct several ASR experiments to test a feature set derived from the GDF. We ?nd that, in most cases, these features perform worse than the standard MFCC features. Therefore, we suggest that a short-time phase spectrum feature set may ultimately be derived from a concatenation of information from both the GDF and IFD representations. For best performance, the feature set may also need to be concatenated with short-time magnitude spectrum information. Further to addressing the two aforementioned points, we also discuss a number of other speech applications in which the short-time phase spectrum has proven to be very useful. We believe that an appreciation for how the short-time phase spectrum has been used for other tasks, in addition to the results of our research, will provoke fellow researchers to also investigate its potential for use in ASR.
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高樹豐 i Shu-fung Ko. "Emission morphologies and phase-resolved spectrum of gamma ray pulsar". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2001. http://hub.hku.hk/bib/B31224489.

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Ko, Shu-fung. "Emission morphologies and phase-resolved spectrum of gamma ray pulsar /". Hong Kong : University of Hong Kong, 2001. http://sunzi.lib.hku.hk:8888/cgi-bin/hkuto%5Ftoc%5Fpdf?B23476370.

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Alsteris, Leigh. "Short-Time Phase Spectrum in Human and Automatic Speech Recognition". Thesis, Griffith University, 2006. http://hdl.handle.net/10072/366602.

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Incorporating information from the short-time phase spectrum into a feature set for automatic speech recognition (ASR) may possibly serve to improve recognition accuracy. Currently, however, it is common practice to discard this information in favour of features that are derived purely from the short-time magnitude spectrum. There are two reasons for this: 1) the results of some well-known human listening experiments have indicated that the short-time phase spectrum conveys a negligible amount of intelligibility at the small window durations of 20-40 ms used for ASR spectral analysis, and 2) using the short-time phase spectrum directly for ASR has proven di?cult from a signal processing viewpoint, due to phase-wrapping and other problems. In this thesis, we explore the possibility of using short-time phase spectrum information for ASR by considering the two points mentioned above. To address the ?rst point, we conduct our own set of human listening experiments. Contrary to previous studies, our results indicate that the short-time phase spectrum can indeed contribute signi?cantly to speech intelligibility over small window durations of 20-40 ms. Also, the results of these listening experiments, in addition to some ASR experiments, indicate that at least part of this intelligibility may be supplementary to that provided by the short-time magnitude spectrum. To address the second point (i.e., the signal processing di?culties), it may be necessary to transform the short-time phase spectrum into a more physically meaningful representation from which useful features could possibly be extracted. Speci?cally, we investigate the frequency-derivative (or group delay function, GDF) and the time-derivative (or instantaneous frequency distribution, IFD) as potential candidates for this intermediate representation. We have performed various experiments which show that the GDF and IFD may be useful for ASR. We conduct several ASR experiments to test a feature set derived from the GDF. We ?nd that, in most cases, these features perform worse than the standard MFCC features. Therefore, we suggest that a short-time phase spectrum feature set may ultimately be derived from a concatenation of information from both the GDF and IFD representations. For best performance, the feature set may also need to be concatenated with short-time magnitude spectrum information. Further to addressing the two aforementioned points, we also discuss a number of other speech applications in which the short-time phase spectrum has proven to be very useful. We believe that an appreciation for how the short-time phase spectrum has been used for other tasks, in addition to the results of our research, will provoke fellow researchers to also investigate its potential for use in ASR.
Thesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Microelectronic Engineering
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Wojcicki, Kamil Krzysztof. "Role of the Short-Time Phase Spectrum in Speech Processing". Thesis, Griffith University, 2011. http://hdl.handle.net/10072/366376.

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Majority of speech processing algorithms that employ the short-time Fourier transform process the short-time magnitude spectrum, while either discarding the short-time phase spectrum or leaving it unchanged. This is in-part due to a long-standing belief among speech researchers that the short-time phase spectrum, computed over small analysis window durations of 20–40 ms, contains little useful information and is thus (mostly) unimportant for speech processing (though it is accepted that the phase spectrum does contribute to some extent to naturalness and quality aspects of speech). The above belief has been supported by numerous studies presented in the literature. Results of recent speech perception experiments suggest, however, that the phase spectrum (at small analysis window durations of 20–40 ms) does contain significant amount of useful information, provided that the analysis window function is carefully selected. It was reported that the use of non-tapered analysis windows functions (such as the rectangular window) significantly improves intelligibility of the phase spectrum. This improvement was attributed to the spectral characteristics of the non-tapered analysis windows and—in particular—to their low spectral dynamic range. The main aim of the research presented in this dissertation is to further examine the importance of the short-time phase spectrum for human speech perception. It is hoped that results of such an examination can provide an incentive for further research in this direction. Three studies that investigate the usefulness of the phase spectrum for human speech perception are presented in this thesis. These studies employ human listening tests to explore the importance of the phase spectrum for speech intelligibility, speaker dependent speech information and speech quality. In each of these studies the effect of the spectral dynamic range of an analysis window function is systematically examined.
Thesis (PhD Doctorate)
Doctor of Philosophy (PhD)
Griffith School of Engineering
Science, Environment, Engineering and Technology
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Thayaparan, Subramaniam. "Delay-locked loop techniques in direct sequence spread-spectrum receivers". Thesis, Hong Kong : University of Hong Kong, 1999. http://sunzi.lib.hku.hk/hkuto/record.jsp?B21904108.

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Tran, Ky-Anh. "A spread-spectrum clock generator using phase interpolation for EMI reduction". Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/91700.

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Thesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2014.
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 123-125).
The spurious-free dynamic range of RF DAC's are limited by the heavy digital do- main switching, which interferes with the analog output signal. A design, layout and simulation of a spread-spectrum clock generator (SSCG) is presented. The SSCG modulates the clock frequency used to switch the digital blocks of the DAC in order to reduce electromagnetic interference (EMI) spurs at the analog output signal of the DAC. Leveraging on a phase control architecture rather than a traditional PLL, the SSCG system is shown to reduce the spectral height a divided down clock spur up to 19.6dB. The SSCG is designed in TSMC's 65nm CMOS process. It takes in quadrature, differential clocks at either 2.5GHz or 5GHz, and provides quadrature output clocks at 625MHz or 1.25GHz. The output spectrum of the clock can be attenuated up to 19.6dB relative to the spectrum of an unspread clock. The core of the SSCG is a phase interpolator, which takes in quadrature input clocks and interpolates between them to move the frequency around. To help process the signals before and after interpolation, the SSCG incorporates input variable gain lters, output restoration buffers and divide by 4 circuits. Extensive transistor and behavioral simulations are used to verify the design.
by Ky-Anh Tran.
M. Eng.
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Książki na temat "Phase spectrum"

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Jonathan, Frank, Beerman Henry i United States. National Aeronautics and Space Administration., red. Multicolor pyrometer for materials processing in space, phase II. [Washington, DC: National Aeronautics and Space Administration, 1989.

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Jonathan, Frank, Beerman Henry i United States. National Aeronautics and Space Administration., red. Multicolor pyrometer for materials processing in space, phase II. [Washington, DC: National Aeronautics and Space Administration, 1988.

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Blanc, A. Identification de reṕonse impulsionnelle et restauration d'images: Apports de la diversite ́de phase. Chatillon [France]: ONERA, 2003.

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Ruiz, Antonio. Flow through optosensors. Hauppauge, N.Y: Nova Science Publishers, 2011.

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Megaw, Judith. To explore the issues that may arise for families of young adults with autistic spectrum disorder during the transition phase, i.e. when the young adult leaves school and becomes integrated into the community. (s.l: The Author), 2000.

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Thomas, Martin. Theoretical Modeling of Vibrational Spectra in the Liquid Phase. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-49628-3.

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Karl, Pfleger. Mass spectral and GC data of drugs, poisons, pesticides, pollutants, and their metabolites. Wyd. 2. Weinheim: VCH, 1992.

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Nesenbergs, M. Power spectral densities for selected digital phase-continuous MFSK emissions. [Boulder, CO]: U.S. Dept. of Commerce, National Telecommunications and Information Administration, 1989.

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L, Smith D., Jones L. Thomas i United States. National Telecommunications and Information Administration., red. Power spectral densities for selected digital phase-continuous MFSK emissions. [Boulder, CO]: U.S. Dept. of Commerce, National Telecommunications and Information Administration, 1989.

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Sanders, Frank H. Phased array antenna pattern variation with frequency and implications for radar spectrum measurements. Washington, D.C: U. S. Dept., of Commerce, National Telecommunications and Information Administration, 2005.

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Części książek na temat "Phase spectrum"

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Elsner, James B., i Anastasios A. Tsonis. "Phase Space Reconstruction". W Singular Spectrum Analysis, 143–55. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4757-2514-8_10.

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Zhang, Renyan. "Blur Detection via Phase Spectrum". W Computer Vision – ACCV 2018, 733–48. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-20876-9_46.

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Steendam, Heidi, i Marc Moeneclaey. "Sensitivity of OFDM/CDMA to Carrier Phase Jitter". W Multi-Carrier Spread-Spectrum, 145–52. Boston, MA: Springer US, 1997. http://dx.doi.org/10.1007/978-1-4615-6231-3_17.

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Hazzard, Kaden Richard Alan. "RF Spectra: Multiple Peaked Spectrum in a Homogeneous System". W Quantum Phase Transitions in Cold Atoms and Low Temperature Solids, 51–62. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-8179-0_5.

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Suyama, S., K. Tochihara, H. Suzuki i K. Fukawa. "A MIMO-OFDM Transmission Scheme Employing Subcarrier Phase Hopping". W Multi-Carrier Spread-Spectrum, 275–82. Dordrecht: Springer Netherlands, 2006. http://dx.doi.org/10.1007/1-4020-4437-2_29.

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Tubbax, Jan, Boris Côme, Liesbet Van Der Perre, Stéphane Donnay i Marc Engels. "Joint Compensation of IQ Imbalance, Frequency Offset and Phase Noise". W Multi-Carrier Spread-Spectrum, 473–80. Dordrecht: Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-94-017-0502-8_53.

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Skurowski, Przemysław, i Aleksandra Gruca. "Image Quality Assessment Using Phase Spectrum Correlation". W Computer Vision and Graphics, 80–89. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-02345-3_9.

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Trebino, Rick, i Erik Zeek. "The Autocorrelation, the Spectrum, and Phase Retrieval". W Frequency-Resolved Optical Gating: The Measurement of Ultrashort Laser Pulses, 61–99. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/978-1-4615-1181-6_4.

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Panayirci, E., H. A. Çirpan, M. Moeneclaey i N. Noels. "Blind Phase Noise Estimation in OFDM Systems by Sequential Monte Carlo Method". W Multi-Carrier Spread-Spectrum, 483–90. Dordrecht: Springer Netherlands, 2006. http://dx.doi.org/10.1007/1-4020-4437-2_52.

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Garnier, C., M. Loosvelt i Y. Delignon. "Sensitivity Comparison of Multi-carrier and Spread Spectrum Systems to Phase Noise". W Multi-Carrier Spread-Spectrum, 491–502. Dordrecht: Springer Netherlands, 2006. http://dx.doi.org/10.1007/1-4020-4437-2_53.

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Streszczenia konferencji na temat "Phase spectrum"

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Majeed, Hassaan, Eun Jung Min, Sumin Kim, Woonggyu Jung, Catherine Best-Popescu i Gabriel Popescu. "Magnified image spatial spectrum (MISS) microscopy for high-speed QPI (Conference Presentation)". W Quantitative Phase Imaging II, redaktorzy Gabriel Popescu i YongKeun Park. SPIE, 2016. http://dx.doi.org/10.1117/12.2216130.

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Majeed, Hassaan, Young J. Lee, Catherine Best-Popescu, Gabriel Popescu, Sung-Soo Jang i Hee Jung Chung. "Non-contact measurement of electrical activity in neurons using magnified image spatial spectrum (MISS) microscopy (Conference Presentation)". W Quantitative Phase Imaging III, redaktorzy Gabriel Popescu i YongKeun Park. SPIE, 2017. http://dx.doi.org/10.1117/12.2256817.

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Murray, Graeme, Kevin A. Leslie, Tareq Saleh, Daniel Guest, David A. Gewirtz i Jason Reed. "The spectrum of single cell drug response through the lens of long-term high-speed live cell interferometry". W Quantitative Phase Imaging VII, redaktorzy Gabriel Popescu, YongKeun Park i Yang Liu. SPIE, 2021. http://dx.doi.org/10.1117/12.2577032.

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Kozlov, G. A. "The flux-tube phase transition". W QUARK CONFINEMENT AND THE HADRON SPECTRUM VII: 7th Conference on Quark Confinement and the Hadron Spectrum - QCHS7. AIP, 2007. http://dx.doi.org/10.1063/1.2714426.

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Zhong, Xi-hua, Yue-ming Zhou, Yongkang Guo, Jing Yuan i Jingqin Su. "Spectrum of fractal phase structure". W International Conference on Holography and Optical Information Processing, redaktorzy Guoguang Mu, Guofan Jin i Glenn T. Sincerbox. SPIE, 1996. http://dx.doi.org/10.1117/12.263024.

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Zhuravel, V. M., I. F. Bukhanova, V. N. Antipov i S. F. Ivanov. "Lasing spectrum and active medium gain of multibeam CO2 lasers". W High-Power Multibeam Lasers and Their Phase Locking, redaktorzy Fedor V. Lebedev i Anatoly P. Napartovich. SPIE, 1993. http://dx.doi.org/10.1117/12.160363.

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Ishijima, Tatsuki, i Takahide Sakamoto. "Wideband Ultra-Flat Spectral Enhancement by Cascaded Phase Modulation on Frequency Comb Generated from Mach-Zehnder Modulator". W CLEO: Applications and Technology. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/cleo_at.2022.jth3a.24.

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We demonstrated efficient spectral enhancement of comb generator where cascaded phase-modulation was applied to comb generated from Mach-Zehnder Modulator; additionally enhancing spectra keeping spectral flatness without increasing modulators cascade scale. 25×25-GHz spectrum was experimentally generated.
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Asorey, Manuel, i Alessandro Santagata. "Instability of Coulomb phase in QCD". W Xth Quark Confinement and the Hadron Spectrum. Trieste, Italy: Sissa Medialab, 2013. http://dx.doi.org/10.22323/1.171.0057.

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Deldar, Sedigheh, i Hadi Lookzadeh. "Interaction between vortices in CFL phase". W Xth Quark Confinement and the Hadron Spectrum. Trieste, Italy: Sissa Medialab, 2013. http://dx.doi.org/10.22323/1.171.0292.

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Chen, Zhibo, Yuanze Liu, Guodong Wang, Siyu Wang i Weidong Geng. "Multiband Spectral Subtraction Speech Enhancement Algorithm with Phase Spectrum Compensation". W 2019 IEEE 4th Advanced Information Technology, Electronic and Automation Control Conference (IAEAC). IEEE, 2019. http://dx.doi.org/10.1109/iaeac47372.2019.8997837.

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Raporty organizacyjne na temat "Phase spectrum"

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Marquette, Brandeis, i Armin Walter Doerry. Shaping the spectrum of random-phase radar waveforms. Office of Scientific and Technical Information (OSTI), wrzesień 2012. http://dx.doi.org/10.2172/1051702.

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Pawula, R. F. Applications of Differential Phase Statistics to Studies of C3 and Spread Spectrum Communications. Fort Belvoir, VA: Defense Technical Information Center, styczeń 1985. http://dx.doi.org/10.21236/ada158815.

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Merrill, Albert W., Matthew A. Clark, James Hoffman, Gary L. Gallien, Thomas M. Walsh, Dave Y. Stodden, Sarah A. Lang i Ragini T. Joshi. Commerce Spectrum Management Advisory Committee (CSMAC) Working Group (WG) 3 Phase 2 Study Summary. Fort Belvoir, VA: Defense Technical Information Center, maj 2013. http://dx.doi.org/10.21236/ada590005.

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Sanchez, Rene G., Travis J. Grove i Morgan C. White. IER 153: measure the fision neutron spectrum shape using threshold activation detectors. CEDT phase-1 preliminary design. Office of Scientific and Technical Information (OSTI), grudzień 2011. http://dx.doi.org/10.2172/1130498.

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Kamrath, Matthew, Vladimir Ostashev, D. Wilson, Michael White, Carl Hart i Anthony Finn. Vertical and slanted sound propagation in the near-ground atmosphere : amplitude and phase fluctuations. Engineer Research and Development Center (U.S.), maj 2021. http://dx.doi.org/10.21079/11681/40680.

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Sound propagation along vertical and slanted paths through the near-ground atmosphere impacts detection and localization of low-altitude sound sources, such as small unmanned aerial vehicles, from ground-based microphone arrays. This article experimentally investigates the amplitude and phase fluctuations of acoustic signals propagating along such paths. The experiment involved nine microphones on three horizontal booms mounted at different heights to a 135-m meteorological tower at the National Wind Technology Center (Boulder, CO). A ground-based loudspeaker was placed at the base of the tower for vertical propagation or 56m from the base of the tower for slanted propagation. Phasor scatterplots qualitatively characterize the amplitude and phase fluctuations of the received signals during different meteorological regimes. The measurements are also compared to a theory describing the log-amplitude and phase variances based on the spectrum of shear and buoyancy driven turbulence near the ground. Generally, the theory correctly predicts the measured log-amplitude variances, which are affected primarily by small-scale, isotropic turbulent eddies. However, the theory overpredicts the measured phase variances, which are affected primarily by large-scale, anisotropic, buoyantly driven eddies. Ground blocking of these large eddies likely explains the overprediction.
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Miller i Lane. L51669 Diverless Pipeline Repair Clamp-Phase II. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), kwiecień 1992. http://dx.doi.org/10.55274/r0010416.

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The general goal of the work described herein is to develop the capability to remotely repair minor leaks in pipelines residing in water depths beyond diver work depths. Wells are now being drilled and production facilities are being installed in these water depths at the time of this writing. A wide range of pipeline damage is conceivable. At the least severe end of the spectrum, leakage due to local corrosion or a latent weld defect is possible. More severe damage such as that caused by anchor snagging or mudslides would likely require a more extensive repair capability. This research is limited to addressing repair of minor leaks repairable by installation of a split repair clamp. This report summarizes the Phase II research effort and results. The objective of Phase I was to lay a foundation for eventual development of specific equipment and systems needed to implement the diverless repair clamp. Phase I may be characterized more as an investigation to broadly identify the state of the art in diverless operations and an effort to identify specific technology weaknesses for more detailed study. Another objective of Phase I was to develop generic mechanical concepts for the diverless repair clamp. The objective of Phase II has been to narrow the research focus to select a most favored concept for the mechanical arrangement of the clamp itself and to conceptually describe a preferred method for deploying the clamp. Specifically, the objectives of Phase II were: 1. Develop conceptual designs associated with two different repair philosophies; 2. Investigate and evaluate alternative fastening technologies and clamp-type sealing mechanisms; 3. Investigate installation-related issues such as pipe preparation, ROV capabilities, and ROV interfaces; and 4. Evaluate the two conceptual designs from both a technical and practical standpoint.
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Petrocchi, A. J., i G. A. Zimmerman. Analysis of offsite Emergency Planning Zones (EPZs) for the Rocky Flats Plant. Phase 3, Sitewide spectrum-of-accidents and bounding EPZ analysis. Office of Scientific and Technical Information (OSTI), marzec 1994. http://dx.doi.org/10.2172/10156343.

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Petrocchi, A. J., i M. L. Smith. Analysis of offsite emergency planning zones (EPZs) for the Rocky Flats Plant. Phase 3, Sitewide spectrum-of-accidents and bounding EPZ analysis. Office of Scientific and Technical Information (OSTI), październik 1993. http://dx.doi.org/10.2172/10158845.

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Katz, Sabrina, Miguel Algarin i Emanuel Hernandez. Structuring for Exit: New Approaches for Private Capital in Latin America. Inter-American Development Bank, marzec 2021. http://dx.doi.org/10.18235/0003074.

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Structured financing solutions encompass a range of investment approaches that provide liquidity to investors without the need for a traditional equity exit event, such as a strategic sale, sale to another financial investor, or public market listing. Structuring mechanisms across the debt-to-equity spectrum determine the exit terms of the deal, therefore providing considerable downside protection to investors. Structured financing solutions are an incipient but increasingly important set of tools for investors active in Latin America to address the financing gap for companies that lack access to bank financing and are not attractive targets for traditional PE and VC players. Many investors employing these strategies are in an experimental phase, reporting new lessons learned with each deal completed. Impact investors have been among the top drivers of these structuring innovations, as they have grappled with the additional limitations associated with the straight equity model for environmental or social enterprises. However, the use of structured financing is by no means restricted to the impact investing space. Fund managers have invested USD4b in private credit deals in Latin America since 2018, more than the previous ten years combined. PE and VC investors have also increasingly employed quasi-equity and debt instruments. ACON Investments, for example, has employed mezzanine structures in several deals from its latest funds. Brazil-focused venture capital firm SP Ventures has recently begun investing from its debut venture debt fund. Growing experimentation by fund managers demonstrates the opportunity for investors across ticket sizes, strategies, and the impact-to-commercial spectrum. The structures discussed and the case studies highlighted in this report contain some of the major lessons applicable to a wide group of private capital investors in Latin America targeting certain and timely exits with consistent returns.
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Hutcheson, R. L., i R. Cone. Materials for Spectral Hole Burning Research. Phase 1. Fort Belvoir, VA: Defense Technical Information Center, marzec 1994. http://dx.doi.org/10.21236/ada278480.

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