Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 40 for “"frequency selectivity"”.
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Neural representations of pitch : role of peripheral frequency selectivity
… a major cue for sound source segregation, while frequency components that share a common fundamental frequency (FO) tend to be grouped into a single auditory object. In psychophysics, a positive correlation is commonly observed between the estimated "resolvability" of individual harmonics of …
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Pitch, loudness and frequency selectivity in low-frequency hearing loss
… and cochlear hydrops show fluctuating low-frequency hearing loss (FLFHL). At present these changes are followed as patients' subjective reports and occasional measurements. Consecutive long-term measurements should provide more comprehensive information on the hearing fluctuations than the …
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A FIR Filter Embedded Millimeter-wave Front-end for High Frequency Selectivity
… wave (mm-Wave) has become increasingly popular frequency band for next-generation high-speed wireless communications. In mm-Wave, the wireless channel path loss is severe, demanding a high output power in transmitters (Tx) to meet a required SNR in receivers (Rx). Due to the intractable …
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Frequency Selectivity of Synaptic Exocytosis in Hair Cells of the Bullfrog's Amphibian Papilla
… by decomposing acoustic stimuli into their frequency constituents. Individual auditory afferent neurons of the VIIIth cranial nerve respond best to a particular frequency of stimulation, and are thus frequency-tuned. Much of the tuning in the inner ears of mammals is ascribed to the …
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Methods of frequency selectivity and synchronization measurement in single auditory nerve fibers : application to the alligator lizard
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1985.
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Auditory spectro-temporal processing in the envelope-frequency domain: experiments and models
… methods are used to examine the i) envelope-frequency selectivity, ii) coding of amplitude-modulation depth, and the iii) analysis of complex modulations. A functional model of hearing is proposed that successfully accounts for the empirical data. Chapter 1 derives the bandwidth and the shape …
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Design of energy-efficient ultrasonic communication systems on steel pipes
… communication provides an alternative to radio-frequency (RF) by transmitting guided ultrasonic signals along installed or buried metallic pipes. Buried pipe corrosion monitoring and intermittent infrastructure data collection are potential application areas, for which reliable wireless links …
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Measuring sound-induced motions of the alligator lizard cochlea
The sensitivity and frequency selectivity of the hearing sense are determined primarily by mechanical properties of the cochlea. These mechanical properties are poorly understood in any species. This thesis contributes to our understanding of cochlear mechanics by presenting measurements of …
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A feedback analysis of outer hair cell dynamics
… frequencies and allowing for the sharp frequency selectivity and sensitivity observed in mammals. Excitatory displacement of the basilar membrane causes depolarization of OHC membrane potentials which results in contraction. The motor protein prestin is driven by receptor potentials. …
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The functional role of tectorial membrane poroelasticity in cochlear mechanics
… fundamentally different in the way they control frequency selectivity. To understand the molecular origin of TM viscosity, we investigate traveling waves in genetically modified TMs. We show that nanoscale pores of TectaY1870C/+ TMs are significantly larger than those of Tectb -/- TMs. The larger …
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Pitch perception and harmonic resolvability in normal-hearing and hearing-impaired listeners
… the pitch associated with the fundamental frequency (FO) of complex harmonic sounds. Four studies investigated the relationship between FO discrimination performance and the ability to resolve individual harmonic frequencies of a complex, testing the hypotheses (1) that the accurate FO …
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Cochlear morphology and sound-induced motion of the apical mammalian inner ear
Extraordinary sensitivity, frequency selectivity, and dynamic range are hallmarks of mammalian hearing. While a variety of cellular and molecular mechanisms are known to be critical to these properties, how the cellular and molecular mechanisms interact to generate the remarkable properties remains …
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Auditory model comparison and optimization using dynamic time warping
… exhibits three major transduction phenomena: frequency selectivity, compression, and a limited set of inner hair cell dynamics. We apply these techniques to related work and seek to identify the model that best describes the transduction of both naturally produced and spectrally reduced …
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Measurements and models of electrically-evoked motion in the gerbil organ of Corti
… and play a key role in mammalian cochlear frequency selectivity and hearing sensitivity. To date, the mechanism of cochlear amplification is not well understood and remains a matter of controversy. In order to understand the role of OHC motility in cochlear micromechanics we developed a …
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Using knockout mice to study the molecular mechanisms that shape auditory nerve responses
… of spontaneous and sound-evoked discharge, frequency selectivity, dynamic range, and the relations between spontaneous rate and these other response properties. Three wildtype strains were compared: CBA/CaJ (because it retains normal cochlear sensitivity as it ages); and C57BL/6 and 129/SvJ …
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Understanding the Mechanisms of Motor Learning in the Vestibulo-ocular Reflex
… unlike learning, which has been shown to have frequency selectivity, disruption and rapid consolidation generalize across the range of frequencies. We suggest that disruption and rapid consolidation in the VOR are local mechanisms within the cerebellar cortex, and do not require new learning. …
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In-home PLC to DSL Interference Characterization and Mitigation
… that the PLC-to-DSL interference channels are frequency selective and vary significantly from room to room within the house. Two interference mitigation solutions are proposed in this thesis. The first solution relies on scheduling the PLC channel access; while, the second solution …
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Modeling and design of an active silicon cochlea
… a problem in prior designs, sharpens its high-frequency rolloff slopes, increases its frequency selectivity, and improves its nonlinear compression characteristics. On the circuit side, I first present a novel current-mode log-domain topology that simultaneously increases signal-to-noise ratio …
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Spatio-temporal representation of the pitch of complex tones in the auditory nerve and cochlear nucleus
… on a purely spatial representation based on the frequency selectivity and frequency-to-place mapping in the cochlea, or on a purely temporal representation dependent on neural phase locking to the stimulus period. However, rate-place cues to the pitch of harmonic complex tones in the auditory …
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Nonlinear Periodic Structures: From Classical to Quantum Devices
… that results from the absorption saturation and frequency selectivity of periodic structures, a sensitive and compact optical limiter is designed. The novel design and modeling work developed in this thesis has provided new insights and tools to the utilization of resonant nonlinearities in …
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