Relevant bibliographies by topics / Sweep frequency

Academic literature on the topic 'Sweep frequency'

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Published: 4 June 2021
Last updated: 19 February 2022

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Journal articles on the topic "Sweep frequency"

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Fuzessery, Z. M. "Response selectivity for multiple dimensions of frequency sweeps in the pallid bat inferior colliculus." Journal of Neurophysiology 72, no. 3 (September 1, 1994): 1061–79. http://dx.doi.org/10.1152/jn.1994.72.3.1061.

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1. While hunting, the pallid bat uses passive sound localization at low frequencies to find terrestrial prey, and echolocation for general orientation. It must therefore process two different types of acoustic input at the same time. The pallid bat's echolocation pulse is a downward frequency-modulated (FM) sweep from 60 to 30 kHz. This study examined the response selectivity of single neurons in the pallid bat's central nucleus of the inferior colliculus (ICC) for FM sweeps, comparing the response properties of the high-frequency population, tuned to the biosonar pulse, with the low-frequency population, tuned below the pulse. The working hypothesis was that the high-frequency population would exhibit a response selectivity for downward FM sweeps that was not present in the low-frequency population. 2. Neurons were tested for their selectivity for FM sweep direction, duration, frequency range and bandwidth, and rate of frequency change. The extent to which they responded exclusively to tones, noise, and FM sweeps was also examined. Significant differences in the response properties of neurons in the two populations were found. In the low-frequency population, all neurons responded to tones, but only 50% responded to FM sweeps. Only 23% were selective for sweep direction. In the high-frequency population, all neurons responded to FM sweeps, but 31% did not respond to tones. Over one-half of this population was selective for sweep direction, and of those that were selective, all preferred the downward sweep direction of the biosonar pulse. A large percentage (31%) responded exclusively to downward sweeps, and not to tones or upward sweeps. None of the cells in either population responded to noise, or did so only at very high relative thresholds. 3. Both populations contained neurons that were selective for short stimulus durations that approximated the duration of the biosonar pulse, although the percentage was greater in the high-frequency population (58% vs. 20%). In the high-frequency population, 31% of the neurons tested for duration responded exclusively to both the sweep direction and duration of the biosonar pulse. 4. Downward FM-selective neurons, with one exception, were generally insensitive to the rate of frequency change of the FM sweep, as well as the frequency range and bandwidth of the sweep. They responded similarly to both the full 60- to 30-kHz sweep and to 5-kHz bandwidth portions of the full sweep.(ABSTRACT TRUNCATED AT 400 WORDS)
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Fuzessery, Zoltan M., Marlin D. Richardson, and Michael S. Coburn. "Neural Mechanisms Underlying Selectivity for the Rate and Direction of Frequency-Modulated Sweeps in the Inferior Colliculus of the Pallid Bat." Journal of Neurophysiology 96, no. 3 (September 2006): 1320–36. http://dx.doi.org/10.1152/jn.00021.2006.

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This study describes mechanisms that underlie neuronal selectivity for the direction and rate of frequency-modulated sweeps in the central nucleus of the inferior colliculus (ICC) of the pallid bat ( Antrozous pallidus). This ICC contains a high percentage of neurons (66%) that respond selectively to the downward sweep direction of the bat's echolocation pulse. Some (19%) are specialists that respond only to downward sweeps. Most neurons (83%) are also tuned to sweep rates. A two-tone inhibition paradigm was used to describe inhibitory mechanisms that shape selectivity for sweep direction and rate. Two different mechanisms can create similar rate tuning. The first is an early on-best frequency inhibition that shapes duration tuning, which in turn determines rate tuning. In most neurons that are not duration tuned, a delayed high-frequency inhibition creates rate tuning. These neurons respond to fast sweep rates, but are inhibited as rate slows, and delayed inhibition overlaps excitation. In these neurons, starting a downward sweep within the excitatory tuning curve eliminates rate tuning. However, if rate tuning is shaped by duration tuning, this manipulation has no effect. Selectivity for the downward sweep direction is created by an early low-frequency inhibition that prevents responses to upward sweeps. In addition to this asymmetry in arrival times of low- and high-frequency inhibitions, the bandwidth of the low-frequency sideband was broader. Bandwidth influences the arrival time of inhibition during an FM sweep because a broader sideband will be encountered sooner. These findings show that similar spectrotemporal filters can be created by different mechanisms.
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Razak, K. A. "Mechanisms underlying intensity-dependent changes in cortical selectivity for frequency-modulated sweeps." Journal of Neurophysiology 107, no. 8 (April 15, 2012): 2202–11. http://dx.doi.org/10.1152/jn.00922.2011.

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Frequency-modulated (FM) sweeps are common components of species-specific vocalizations. The intensity of FM sweeps can cover a wide range in the natural environment, but whether intensity affects neural selectivity for FM sweeps is unclear. Bats, such as the pallid bat, which use FM sweeps for echolocation, are suited to address this issue, because the intensity of echoes will vary with target distance. In this study, FM sweep rate selectivity of pallid bat auditory cortex neurons was measured using downward sweeps at different intensities. Neurons became more selective for FM sweep rates present in the bat's echolocation calls as intensity increased. Increased selectivity resulted from stronger inhibition of responses to slower sweep rates. The timing and bandwidth of inhibition generated by frequencies on the high side of the excitatory tuning curve [sideband high-frequency inhibition (HFI)] shape rate selectivity in cortical neurons in the pallid bat. To determine whether intensity-dependent changes in FM rate selectivity were due to altered inhibition, the timing and bandwidth of HFI were quantified at multiple intensities using the two-tone inhibition paradigm. HFI arrived faster relative to excitation as sound intensity increased. The bandwidth of HFI also increased with intensity. The changes in HFI predicted intensity-dependent changes in FM rate selectivity. These data suggest that neural selectivity for a sweep parameter is not static but shifts with intensity due to changes in properties of sideband inhibition.
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Tabas, Alejandro, and Katharina von Kriegstein. "Neural modelling of the encoding of fast frequency modulation." PLOS Computational Biology 17, no. 3 (March 3, 2021): e1008787. http://dx.doi.org/10.1371/journal.pcbi.1008787.

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Frequency modulation (FM) is a basic constituent of vocalisation in many animals as well as in humans. In human speech, short rising and falling FM-sweeps of around 50 ms duration, called formant transitions, characterise individual speech sounds. There are two representations of FM in the ascending auditory pathway: a spectral representation, holding the instantaneous frequency of the stimuli; and a sweep representation, consisting of neurons that respond selectively to FM direction. To-date computational models use feedforward mechanisms to explain FM encoding. However, from neuroanatomy we know that there are massive feedback projections in the auditory pathway. Here, we found that a classical FM-sweep perceptual effect, the sweep pitch shift, cannot be explained by standard feedforward processing models. We hypothesised that the sweep pitch shift is caused by a predictive feedback mechanism. To test this hypothesis, we developed a novel model of FM encoding incorporating a predictive interaction between the sweep and the spectral representation. The model was designed to encode sweeps of the duration, modulation rate, and modulation shape of formant transitions. It fully accounted for experimental data that we acquired in a perceptual experiment with human participants as well as previously published experimental results. We also designed a new class of stimuli for a second perceptual experiment to further validate the model. Combined, our results indicate that predictive interaction between the frequency encoding and direction encoding neural representations plays an important role in the neural processing of FM. In the brain, this mechanism is likely to occur at early stages of the processing hierarchy.
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Morrison, James A., Roberto Valdizón-Rodríguez, Daniel Goldreich, and Paul A. Faure. "Tuning for rate and duration of frequency-modulated sweeps in the mammalian inferior colliculus." Journal of Neurophysiology 120, no. 3 (September 1, 2018): 985–97. http://dx.doi.org/10.1152/jn.00065.2018.

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Responses of auditory duration-tuned neurons (DTNs) are selective for stimulus duration. We used single-unit extracellular recording to investigate how the inferior colliculus (IC) encodes frequency-modulated (FM) sweeps in the big brown bat. It was unclear whether the responses of so-called “FM DTNs” encode signal duration, like classic pure-tone DTNs, or the FM sweep rate. Most FM cells had spiking responses selective for downward FM sweeps. We presented cells with linear FM sweeps whose center frequency (CEF) was set to the best excitatory frequency and whose bandwidth (BW) maximized the spike count. With these baseline parameters, we stimulated cells with linear FM sweeps randomly varied in duration to measure the range of excitatory FM durations and/or sweep rates. To separate FM rate and FM duration tuning, we doubled (and halved) the BW of the baseline FM stimulus while keeping the CEF constant and then recollected each cell’s FM duration tuning curve. If the cell was tuned to FM duration, then the best duration (or range of excitatory durations) should remain constant despite changes in signal BW; however, if the cell was tuned to the FM rate, then the best duration should covary with the same FM rate at each BW. A Bayesian model comparison revealed that the majority of neurons were tuned to the FM sweep rate, although a few cells showed tuning for FM duration. We conclude that the dominant parameter for temporal tuning of FM neurons in the IC is FM sweep rate and not FM duration. NEW & NOTEWORTHY Reports of inferior colliculus neurons with response selectivity to the duration of frequency-modulated (FM) stimuli exist, yet it remains unclear whether such cells are tuned to the FM duration or the FM sweep rate. To disambiguate these hypotheses, we presented neurons with variable-duration FM signals that were systematically manipulated in bandwidth. A Bayesian model comparison revealed that most temporally selective midbrain cells were tuned to the FM sweep rate and not the FM duration.
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Atencio, Craig A., David T. Blake, Fabrizio Strata, Steven W. Cheung, Michael M. Merzenich, and Christoph E. Schreiner. "Frequency-Modulation Encoding in the Primary Auditory Cortex of the Awake Owl Monkey." Journal of Neurophysiology 98, no. 4 (October 2007): 2182–95. http://dx.doi.org/10.1152/jn.00394.2007.

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Many communication sounds, such as New World monkey twitter calls, contain frequency-modulated (FM) sweeps. To determine how this prominent vocalization element is represented in the auditory cortex we examined neural responses to logarithmic FM sweep stimuli in the primary auditory cortex (AI) of two awake owl monkeys. Using an implanted array of microelectrodes we quantitatively characterized neuronal responses to FM sweeps and to random tone-pip stimuli. Tone-pip responses were used to construct spectrotemporal receptive fields (STRFs). Classification of FM sweep responses revealed few neurons with high direction and speed selectivity. Most neurons responded to sweeps in both directions and over a broad range of sweep speeds. Characteristic frequency estimates from FM responses were highly correlated with estimates from STRFs, although spectral receptive field bandwidth was consistently underestimated by FM stimuli. Predictions of FM direction selectivity and best speed from STRFs were significantly correlated with observed FM responses, although some systematic discrepancies existed. Last, the population distributions of FM responses in the awake owl monkey were similar to, although of longer temporal duration than, those in the anesthetized squirrel monkeys.
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Okaya, David A., Eleni Karageorgi, Thomas V. McEvilly, and Peter E. Malin. "Removing vibrator‐induced correlation artifacts by filtering in frequency‐uncorrelated time space." GEOPHYSICS 57, no. 7 (July 1992): 916–26. http://dx.doi.org/10.1190/1.1443304.

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Vibrator‐to‐ground coupling can produce resonance‐induced energy that propagates with the primary sweep and produces serious artifacts in the correlated seismogram due to the frequency structure of this offending energy. For sweeps linearly increasing in frequency, the resulting artifact is observed (uncorrelated) to increase in frequency at a linear rate differing from the original sweep. Upon crosscorrelation with the pilot sweep, the artifact‐producing energy becomes distributed over an extended range of time while the normal reflected sweep is compressed, by design, into a narrow correlation wavelet. The resulting traces thus exhibit strong amplitudes that increase monotonically in dominant frequency. Display of individual uncorrelated seismograms using a Fourier frequency‐uncorrelated time (F-T) transformation reveals the relationship between the primary sweep and the induced artifact. “Surgical” filtering in this new F-T space provides for a first‐order removal of both the artifact and the energy in sweep harmonics as induced by the stong first arrivals. Two‐dimensional (2-D) spectral filtering of the modulus of the (complex) 2-D transform of the F-T data provides better rejection of the unwanted energy. Application of this trace‐by‐trace filtering process to a badly contaminated crustal-scale multichannel CDP profile in the southern San Joaquin Valley, California, reveals significant reflections from the middle and lower crust that were obscured in the unfiltered profile.
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Harris, Alexandre M., and Michael DeGiorgio. "Identifying and Classifying Shared Selective Sweeps from Multilocus Data." Genetics 215, no. 1 (March 9, 2020): 143–71. http://dx.doi.org/10.1534/genetics.120.303137.

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Positive selection causes beneficial alleles to rise to high frequency, resulting in a selective sweep of the diversity surrounding the selected sites. Accordingly, the signature of a selective sweep in an ancestral population may still remain in its descendants. Identifying signatures of selection in the ancestor that are shared among its descendants is important to contextualize the timing of a sweep, but few methods exist for this purpose. We introduce the statistic SS-H12, which can identify genomic regions under shared positive selection across populations and is based on the theory of the expected haplotype homozygosity statistic H12, which detects recent hard and soft sweeps from the presence of high-frequency haplotypes. SS-H12 is distinct from comparable statistics because it requires a minimum of only two populations, and properly identifies and differentiates between independent convergent sweeps and true ancestral sweeps, with high power and robustness to a variety of demographic models. Furthermore, we can apply SS-H12 in conjunction with the ratio of statistics we term H2Tot and H1Tot to further classify identified shared sweeps as hard or soft. Finally, we identified both previously reported and novel shared sweep candidates from human whole-genome sequences. Previously reported candidates include the well-characterized ancestral sweeps at LCT and SLC24A5 in Indo-Europeans, as well as GPHN worldwide. Novel candidates include an ancestral sweep at RGS18 in sub-Saharan Africans involved in regulating the platelet response and implicated in sudden cardiac death, and a convergent sweep at C2CD5 between European and East Asian populations that may explain their different insulin responses.
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Razak, Khaleel A., and Zoltan M. Fuzessery. "GABA Shapes Selectivity for the Rate and Direction of Frequency-Modulated Sweeps in the Auditory Cortex." Journal of Neurophysiology 102, no. 3 (September 2009): 1366–78. http://dx.doi.org/10.1152/jn.00334.2009.

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In the pallid bat auditory cortex and inferior colliculus (IC), the majority of neurons tuned in the echolocation range is selective for the direction and rate of frequency-modulated (FM) sweeps used in echolocation. Such selectivity is shaped mainly by spectrotemporal asymmetries in sideband inhibition. An early-arriving, low-frequency inhibition (LFI) shapes direction selectivity. A delayed, high-frequency inhibition (HFI) shapes rate selectivity for downward sweeps. Using iontophoretic blockade of GABAa receptors, we show that cortical FM sweep selectivity is at least partially shaped locally. GABAa receptor antagonists, bicuculline or gabazine, reduced or eliminated direction and rate selectivity in ∼50% of neurons. Intracortical GABA shapes FM sweep selectivity by either creating the underlying sideband inhibition or by advancing the arrival time of inhibition relative to excitation. Given that FM sweep selectivity and asymmetries in sideband inhibition are already present in the IC, these data suggest a refinement or recreation of similar response properties at the cortical level.
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Grombacher, Denys, Raphael Dlugosch, Elliot Grunewald, Mike Müller-Petke, and Esben Auken. "Frequency cycling to alleviate unknown frequency offsets for adiabatic half-passage pulses in surface nuclear magnetic resonance." GEOPHYSICS 83, no. 5 (September 1, 2018): JM29—JM38. http://dx.doi.org/10.1190/geo2017-0701.1.

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Adiabatic half-passage (AHP) pulses show great promise for significantly enhancing the signal-to-noise ratio of the surface nuclear magnetic resonance (NMR) free-induction decay measurement. Performing an AHP requires that the frequency sweep terminates when the transmit frequency is equal to the Larmor frequency, a condition that demands accurate knowledge of the true Larmor frequency. If the frequency sweep is terminated at an incorrect frequency, i.e., with an unknown offset between the transmit and Larmor frequency at the end of the pulse, the net excitation is affected and it can differ from that predicted by modeling that assumes a 0 Hz offset at the end of the sweep. Surface NMR surveys using a traditional single-frequency pulse have previously been shown to display degraded performance in the presence of an uncertain Larmor frequency estimate; the AHP pulse is also likely susceptible to such degraded performance. To ensure that reliable results can be produced by AHP pulses in the presence of an uncertain Larmor frequency estimate, we have developed an approach that adapts the frequency-cycling scheme for use with AHP pulses. We hypothesize that data collected using two similar AHP pulses, each with the exact same frequency sweep but where one sweeps toward the Larmor frequency from higher frequencies and the other from lower frequencies, can be stacked in such a manner that the impact of an unknown frequency offset is significantly reduced. We present synthetic and field results to demonstrate that frequency-cycling AHP pulse surface NMR data can ensure reliable performance even in the presence of an uncertain Larmor frequency estimate.
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Dissertations / Theses on the topic "Sweep frequency"

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Burt, Graeme C. "Sweep-frequency microwave pulse compression using a helically corrugated waveguide." Thesis, University of Strathclyde, 2004. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=21549.

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A new type of pulse compressor based on sweep frequency pulse compression has been developed using a helically corrugated waveguide as a dispersive medium. This structure provides selective coupling between a TE₁₁ travelling wave and a near cut-off TE₂₁ wave, creating an eigenwave where the dispersion characteristics of one mode gradually converts into that of other. As the compressor works far from cut-off the reflections associated with operation close to cut-off are reduced and allows the compressor to be used at the output of a powerful amplifier. An experimental and theoretical study of swept-frequency based pulse compression as well as a theoretical and experimental investigation of the dispersive properties of a circular waveguide with a helical corrugation on its inner surface was carried out. Measurements of the helically corrugated compressor obtained a maximum optimum power compression ratio of 10.9 for a helically corrugated waveguide of length 208.08cm. A 1 kilowatt input pulse with a frequency sweep from 9.60GHz to 9.35GHz over 70ns was compressed by the helically corrugated waveguide. The compressed pulse had a duration of 3ns and gave a compression efficiency of 44%. The helical compressor experiments conducted were the first of their kind to be carried out and were found to be in good agreement with theory. A numerical study of the potential of the helically corrugated waveguide to produce multi-GW output pulses using frequency modulation at the falling edge of a microwave pulse produced from a high-power BWO was investigated.
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Pedholla, Prashanth Kumar. "Rheological and mechanical analysis of bituminous mixtures modified with recycled crumb rubber by wet technology." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017.

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Road construction and maintenance is not only expensive, but it also has a huge impact on the environment. Being context sensitive in finding the material for the asphalt pavement with a superior quality have been always a challenge. The use of recycled material might be a good solution for reducing the overall impact of the road infrastructures. This report studied the effect of using crumb rubber in the asphalt mixture. The research was based on a practical experience of using crumb rubber modified mixture in Zola Predosa, Bologna (Italy). The mixtures were also having limestone filler as a modifier. Mastic(Binder-modifier system) and mortar (mastic-fine aggregate system) mixture having different quantities of crumb rubber and limestone filler modifiers have been tested in order to find the best rutting resistance combination with an acceptable stiffness. The rheological tests on bituminous mastics and mortars have done in the laboratories of University of Bologna. The results show that using fine crumb rubber reduces the thermo sensibility of the mastic (Binder Bitumen System) and improves its elasticity. Limestone filler in the other hand increases the mixture stiffness at high Frequencies.
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Slone, Rodney Daryl. "Fast frequency sweep model order reduction of polynomial matrix equations resulting from finite element discretizations /." The Ohio State University, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=osu148645926752162.

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Kramer, Michael L. "Collinearity and Surround Size Effects on Spatial Discrimination Tasks." Miami University / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=miami1154716341.

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Chandrasekharan, Nair Vinod Chandran [Verfasser], and Martin [Akademischer Betreuer] Jansen. "Heteronuclear spin decoupling sequences with frequency sweep in solid-state NMR spectroscopy / Vinod Chandran Chandrasekharan Nair. Betreuer: Martin Jansen." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2012. http://d-nb.info/1021343560/34.

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Bircan, Cavit. "Determination of protein denaturation and other conformational changes using the dielectric properties utilizing a frequency sweep at different temperatures /." The Ohio State University, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=osu1486394475980442.

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Al-Tahir, Hibah. "Multidimensional Measurements : on RF Power Amplifiers." Thesis, University of Gävle, Department of Technology and Built Environment, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-729.

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In this thesis, a measurement system was set to perform comprehensive measurements on RF power amplifiers. Data obtained from the measurements is then processed mathematically to obtain three dimensional graphs of the basic parameters affected or generated by nonlinearities of the amplifier i.e. gain, efficiency and distortion. Using a class AB amplifier as the DUT, two sets of signals – both swept in power level and frequency - were generated to validate the method, a two-tone signal and a WCDMA signal. The three dimensional plot gives a thorough representation of the behavior of the amplifier in any arbitrary range of spectrum and input level. Sweet spots are consequently easy to detect and analyze. The measurement setup can also yield other three dimensional plots of variations of gain, efficiency or distortion versus frequencies and input levels. Moreover, the measurement tool can be used to plot traditional two dimensional plots such as, input versus gain, frequency versus efficiency etc, making the setup a practical tool for RF amplifiers designers.

The test signals were generated by computer then sent to a vector signal generator that generates the actual signals fed to the amplifier. The output of the amplifier is fed to a vector signal analyzer then collected by computer to be handled. MATLAB® was used throughout the entire process.

The distortion considered in the case of the two-tone signals is the third order intermodulation distortion (IM3) whereas Adjacent Channel Power Ratio (ACPR) was considered in the case of WCDMA.

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Senturk, Sabri. "Experimental Determination Of Transfer Functions For A Car Body-in-white." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12604899/index.pdf.

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Vibration generated from various sources (engine, road surface, tires, exhaust, etc.) should be considered in the design of a car body. These vibrations travel through transfer systems (drivetrain, suspension, body, etc.) to the steering wheel, seats and other areas where it is detected by the passengers of the vehicle. Transmission routes must be studied and efforts made to keep transfer systems from amplifying vibration and to absorb it instead. Since the superior vibration transfer system is the car body, finite element analysis and experimental vibration analysis are performed on car body-in-white. Body vibration analysis entails understanding and improving the body&rsquo
s dynamic characteristics that act as vibration transfer channels. In the previous study, a finite element model has been created for a car body-in-white available in Automotive Laboratory (Mechanical Engineering Department, Middle East Technical University, Ankara) and its natural frequencies and mode shapes have been determined using finite element analysis software. In this study, vibration tests have been performed on actual car body-in-white. Frequency response functions between 34 response locations and force application point have been measured. Using these frequency response functions, natural frequencies and mode shapes of the body-in-white have been determined. Finite element analysis and experimental results have been compared to evaluate the finite element model reliability.
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Bowman, Denise Michelle. "Estimating mechanical frequency tuning properties of the cochlea with f¦1- and f¦2-sweep distortion-product otoacoustic emission measurements in normal hearing human adults." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape15/PQDD_0001/NQ34658.pdf.

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Calamelli, Filippo. "Studio reologico di mastici per miscele di conglomerato bituminoso drenante contenente polverino di gomma da pfu." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2016.

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Le prestazioni meccaniche di una miscela di conglomerato bituminoso dipendono principalmente dai materiali che la compongono e dalla loro interazione. La risposta tenso-deformativa delle sovrastrutture stradali è strettamente legata al comportamento reologico del legante bituminoso e dalla sua interazione con lo scheletro litico. In particolare nelle pavimentazioni drenanti, a causa dell’elevato contenuto di vuoti, il legame che si crea tra il legante (mastice bituminoso) e l’aggregato è molto forte, per questo motivo è importante migliorarne le prestazioni. Additivando il mastice con polverino di gomma da PFU (pneumatici fuori uso), non solo si migliorano prestazioni, resistenza alle deformazioni permanenti ed elastoplasticità del materiale, ma si sfruttano anche materiali di recupero, portando vantaggi anche dal punto di vista ambientale. In quest’ottica la ricerca effettuata nella tesi si pone come obiettivo l’analisi reologica e lo studio di mastici additivati con polverino di gomma ricavato da PFU, per la realizzazione di conglomerati bituminosi drenanti. In particolare, partendo da un bitume di base, sono stati preparati due mastici: il primo ottenuto miscelando bitume modificato e filler calcareo, il secondo aggiungendo al precedente anche il polverino di gomma. Tale studio è stato eseguito mediante l’utilizzo del DSR (Dynamic Shear Rheometer – UNI EN 14770), con il quale sono state affrontate tre prove: Amplitude Sweep test, per la valutazione del valore di deformazione di taglio γ entro il quale il materiale si mantiene all’interno del campo di viscoelasticità lineare (Linear visco-elasticity, LVE); Frequency Sweep test, per l’estrapolazione delle master curves; Multiple stress Creep Recovery, per valutare la resistenza del materiale alle deformazioni permanenti. Dall’analisi dei dati è stato possibile definire il comportamento reologico di entrambi i mastici e, in seconda analisi, confrontarne le caratteristiche e le prestazioni.
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Books on the topic "Sweep frequency"

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Demonstration of frequency-sweep testing technique using a Bell 214-ST helicopter. Moffett Field, Calif: National Aeronautics and Space Administration, Ames Research Center, 1987.

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B, Tischler Mark, Ames Research Center, and United States. Army Aviation Research and Technology Activity., eds. Demonstration of frequency-sweep testing technique using a Bell 214-ST helicopter. Moffett Field, Calif: National Aeronautics and Space Administration, Ames Research Center, 1987.

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Walsh, Bruce, and Michael Lynch. Hitchhiking and Selective Sweeps. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198830870.003.0008.

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When a favorable allele increases in frequency, it alters the coalescent structure (the pattern of times back to a common ancestor) at linked sites relative to that under drift. This creates patterns of sequence polymorphism than can be used to potentially detect ongoing, or very recent, selection. This idea of a neutral allele hitchhiking up to high frequency when coupled to a favorable allele is the notion of a selective sweep, and this chapter reviews the considerable body of associated population-genetics theory on sweeps. Different types of sweeps leave different signatures, resulting in the very diverse collection of tests of selection discussed in Chapter 9. Either a history of recurrent sweeps, or of background selection, results in linked genomic regions of reduced effective population size. This implies that more mutations in sich regions are efficiently neutral, which can result in increased substitution rates and lower codon bias. Finally, the chapter examines the theory for when response is expected to start from existing variation, as opposed to waiting for the appearance of new mutations.
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Walsh, Bruce, and Michael Lynch. Using Molecular Data to Detect Selection: Signatures from Recent Single Events. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198830870.003.0009.

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Different types and phases of a selective sweep (hard, soft, partial, polygenic) generate different patterns of departures from neutrality, and hence require different tests. It is thus not surprising that a large number of tests have been proposed that use sequence information to detect ongoing, or very-recently completed, episodes of selection. This chapter critically reviews over 50 such tests, which use information on allele-frequency change, linkage disequilibrium patterns, spatial allele-frequency patterns, site-frequency spectrum data, allele-frequency spectrum data, and haplotype structure. This chapter discusses the domain of applicability for each test, and their strengths and weaknesses. Finally, this chapter examines application of these methods in the search for recent, or ongoing, selection in humans and for genes involved in the domestication process in plants and animals.
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Congendo, Marco, and Fernando H. Lopes da Silva. Event-Related Potentials. Edited by Donald L. Schomer and Fernando H. Lopes da Silva. Oxford University Press, 2017. http://dx.doi.org/10.1093/med/9780190228484.003.0039.

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Event-related potentials (ERPs) can be elicited by a variety of stimuli and events in diverse conditions. This chapter covers the methodology of analyzing and quantifying ERPs in general. Basic models (additive, phase modulation and resetting, potential asymmetry) that account for the generation of ERPs are discussed. The principles and requirements of ensemble time averaging are presented, along with several univariate and multivariate methods that have been proposed to improve the averaging procedure: wavelet decomposition and denoising, spatial, temporal and spatio-temporal filtering. We emphasize basic concepts of principal component analysis, common spatial pattern, and blind source separation, including independent component analysis. We cover practical questions related to the averaging procedure: overlapping ERPs, correcting inter-sweep latency and amplitude variability, alternative averaging methods (e.g., median), and estimation of ERP onset. Some specific aspects of ERP analysis in the frequency domain are surveyed, along with topographic analysis, statistical testing, and classification methods.
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Stoia, Nicholas. Sweet Thing. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780190881979.001.0001.

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Sweet Thing: The History and Musical Structure of a Shared American Vernacular Form is a historical and analytical study of one of the most productive and enduring shared musical resources in North American vernacular music. Many of us learn the form as children, when we sing “If you’re happy and you know it clap your hands,” and we hear it frequently in popular music, but usually without realizing that this poetic and rhythmic pattern has been penetrating the minds of musicians and listeners for centuries. The antecedents of the form date back to sixteenth-century Scotland and England, and appear in seventeenth-century English popular music; eighteenth-century English and American broadside balladry; nineteenth-century American folk hymnody, popular song, gospel hymnody, and ragtime; and American folk repertoire collected in the early twentieth century. It continued to generate many songs in early twentieth-century popular genres, including blues, country, and gospel music, through which it entered into many postwar popular genres like rhythm and blues, rock and roll, soul, country pop, the folk revival, and rock music. This book offers the most comprehensive examination to date of the centuries-long history of the scheme, and defines its musical parameters in twentieth-century popular music.
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The effects of aging on temporal processing in the rat medial geniculate nucleus: Frequency-modulated sweeps. Ottawa: National Library of Canada, 2002.

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The effects of aging on temporal processing in the rat inferior colliculus: Responses to frequency-modulated sweeps. Ottawa: National Library of Canada, 2001.

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Book chapters on the topic "Sweep frequency"

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Bittner, Kai, and Hans Georg Brachtendorf. "Multirate Shooting Method with Frequency Sweep for Circuit Simulation." In Scientific Computing in Electrical Engineering, 113–25. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-75538-0_11.

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Zhang, Hui, Tao Wang, Yunshan Zhang, Yujie Pei, Zhongbin Bai, Ling Guan, Yaoding Gu, and Jianguo Xu. "Winding Deformation Detection of Transformer Based on Sweep Frequency Impedance." In Advances in Intelligent Systems and Computing, 1072–79. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-31129-2_102.

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Fratini, A., A. La Gatta, P. Bifulco, M. Cesarelli, and G. Pasquariello. "Leg Muscles Motion during Whole Body Linear Frequency Sweep Vibration." In IFMBE Proceedings, 343–46. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-03889-1_92.

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Abouellail, Youssef, Ahmed Abouellail, Aleksey Soldatov, and El-Saady Gaber. "Inspection of Transformer Mechanical Integrity Using Sweep Frequency Response Method." In Progress in Material Science and Engineering, 39–49. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-68103-6_4.

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Kohri, Parvez Alam, and Manish Singhal. "Frequency Sweep and Width Optimization of Memos-Based Digital Logic Gates." In Algorithms for Intelligent Systems, 77–83. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-4936-6_8.

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Sun, Wei, Qian-Qian Gong, Wen-Jie Wang, Li-Hong Gai, and Li Li. "Research on the Reliability of Narrow-Band Frequency-Sweep Electromagnetic Descaling Instrument." In Communications in Computer and Information Science, 420–25. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-662-45286-8_44.

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Wang, Tao, Yaqing Hu, Xianfeng Li, Hua Zhang, Zhenwei E, Lei Zhang, Zhongbin Bai, and Chunmei Guan. "Analysis Winding Deformation of Power Transformer Detection Using Sweep Frequency Impedance Technology." In Advances in Intelligent Systems and Computing, 1009–16. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-31129-2_94.

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Vion, A., and C. Geuzaine. "Parallel Double Sweep Preconditioner for the Optimized Schwarz Algorithm Applied to High Frequency Helmholtz and Maxwell Equations." In Lecture Notes in Computational Science and Engineering, 239–47. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-18827-0_22.

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de Laat, J. A. P. M., and R. Plomp. "Masking of Short Noise Probes by Frequency Sweeps for Hearing-Impaired and Normal-Hearing Listeners." In Auditory Frequency Selectivity, 397–403. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4613-2247-4_43.

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Ronen, Roy, Glenn Tesler, Ali Akbari, Shay Zakov, Noah A. Rosenberg, and Vineet Bafna. "Haplotype Allele Frequency (HAF) Score: Predicting Carriers of Ongoing Selective Sweeps Without Knowledge of the Adaptive Allele." In Lecture Notes in Computer Science, 276–80. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-16706-0_28.

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Conference papers on the topic "Sweep frequency"

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Wei, Zhouhong. "Linear low-frequency sweep vs customized low-frequency sweep." In SEG Technical Program Expanded Abstracts 2016. Society of Exploration Geophysicists, 2016. http://dx.doi.org/10.1190/segam2016-13277746.1.

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Wan, Xiong, and Pengxi Liu. "Fiber-based ultraviolet frequency sweep laser." In 2015 3rd International Conference on Mechatronics and Industrial Informatics. Paris, France: Atlantis Press, 2015. http://dx.doi.org/10.2991/icmii-15.2015.148.

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TREPESS, D., and R. WHITE. "Shock testing using a rapid frequency sweep." In 31st Structures, Structural Dynamics and Materials Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1990. http://dx.doi.org/10.2514/6.1990-947.

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Holst, Gerald C., and Stephen W. McHugh. "Easy focusing with a sweep frequency target." In Orlando '90, 16-20 April, edited by Gerald C. Holst. SPIE, 1990. http://dx.doi.org/10.1117/12.21782.

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Xiaofeng, Liang, Wang Changhui, Luo Fei, Liu Xiaolong, and Wangkun*. "Frequency compensation analysis of vibroseis nonlinear sweep." In SPG/SEG 2016 International Geophysical Conference, Beijing, China, 20-22 April 2016. Society of Exploration Geophysicists and Society of Petroleum Geophysicists, 2016. http://dx.doi.org/10.1190/igcbeijing2016-165.

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Rahammer, M., and M. Kreutzbruck. "Impact Damage Sizing with Resonant Frequency Sweep Thermography." In 2018 Quantitative InfraRed Thermography. QIRT Council, 2018. http://dx.doi.org/10.21611/qirt.2018.138.

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Weiwei, Jia, Zhao Tao, and Dong Chunzhu. "Radar echo simulation using wideband sweep frequency data." In 2016 11th International Symposium on Antennas, Propagation and EM Theory (ISAPE). IEEE, 2016. http://dx.doi.org/10.1109/isape.2016.7833925.

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Bennighof, Jeffrey, Matthew Kaplan, Jeffrey Bennighof, and Matthew Kaplan. "Frequency sweep implementation of adaptive multi-level substructuring." In 38th Structures, Structural Dynamics, and Materials Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1997. http://dx.doi.org/10.2514/6.1997-1034.

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Kawanishi, T. "Optical frequency sweep technique using single sideband modulation." In 31st European Conference on Optical Communications (ECOC 2005). IEE, 2005. http://dx.doi.org/10.1049/cp:20050641.

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Freeland, Robert S., Ronald E. Yoder, Michelle L. Miller, and Steven Koppenjan. "Forensic application of sweep-frequency and impulse GPR." In Ninth International Conference on Ground Penetrating Radar (GPR2002), edited by Steven Koppenjan and Hua Lee. SPIE, 2002. http://dx.doi.org/10.1117/12.462241.

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Reports on the topic "Sweep frequency"

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Ouyang, G., V. Jandhyala, N. Champagne, R. Sharpe, B. Fasenfest, and J. Rockway. A Generalized Fast Frequency Sweep Algorithm for Coupled Circuit-EM Simulations. Office of Scientific and Technical Information (OSTI), December 2004. http://dx.doi.org/10.2172/15015177.

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