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Neuronal Adaptation and Formant Transition Direction in Vowels: An MMN StudyCrawford, Nathanael 11 March 2014 (has links)
Examined was whether the mismatch negativity (MMN) varied predictably in response to changes in the direction of frequency-modulated tone glides and equivalent second formant transitions in vowels (e.g., /ɪ/ as in “bit” and /e/ as in “bate”). A novel stimulus presentation paradigm was designed to distinguish the MMN from the N1 component. 10 normal-hearing adults with no neurological diseases were recruited and presented stimuli via insert earphones while they watched a silent, subtitled movie. Event-related potentials (ERPs) were recorded from 128 scalp electrodes. The MMN was successfully distinguished from the N1, marking participants’ ability to discriminate vowel stimuli only. A significant early P2 component, which decreased in size with successive stimulus presentations, was also elicited for vowels only and is believed to reflect formant encoding. Discrepancies between vowel and tone results are discussed along with clinical implications and contributions to the fields of ERP and vowel research.
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Optimized digital signal processing algorithms applied to radio communications.Carter, Alan James Auchmuty. January 1992 (has links)
The application of digital signal processing to radio communications
has come of age with the advent of low power, high speed microprocessors
and over the past five years, various transceiver architectures,
utilizing this new technology have been extensively researched. Due
to the flexible nature of a software based transceiver, a myriad of
possible applications exist and currently the emphasis is on the
development of suitable algorithms.
The principal aim of this research is the derivation of optimized
digital signal processing algorithms applicable to three separate
areas of radio communications. Optimized, as used by the author within
this dissertation, implies a reasonable compromise between performance,
complexity and numerical processing efficiency. This compromise
is necessary since the algorithms are applied to a portable transceiver
where power consumption, size and weight are limited.
The digital signal processing algorithms described by this research
is as follows:-
1. The derivation and assessment of a multirate speech amplitude
modulation demodulator which exhibits low distortion (typically
less than 2%) for a wide range of modulation indices, carrier
frequency offsets and deviations. The demodulator is processing
efficient and requires only five multiplications and five decisions
for every output sample.
2. The derivation and assessment of a low sampling rate speech
frequency modulation demodulator for signals whose bandwidth exceed
quarter the sampling frequency. The demodulator exhibits low
distortion (typically less than 2%) and is processing efficient
requiring eighteen multiplications and three decisions for every
output sample.
3. The derivation and assessment of a multirate single-sideband
suppressed carrier automatic frequency control system which is a
combination of a simple second order adaptive line enhancer and
a digital phase-locked loop. The processing efficient automatic
frequency control system is suited for low signal to noise power
conditions, in both stationary and mobile communication channels. / Thesis (Ph.D.)-University of Natal, Durban, 1992.
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Bounds and algorithms for carrier frequency and phase estimation /Rice, Feng. Unknown Date (has links)
Quadrature amplitude modulation (QAM) is a highly bandwidth efficient transmission technique for digital communications. It makes use of multiple signal phase and amplitude levels to carry multiple bits per symbol. This requires accurate and robust carrier phase and frequency estimation in the receiver. / Thesis (PhDElectronicEngineering)--University of South Australia, 2002.
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On the design of HF radio modems / Timothy C. Giles.Giles, Timothy C. January 1995 (has links)
Copies of author's previously published articles inserted. / Bibliography: leaves 118-126. / 160 leaves : ill. ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / The subject of this thesis is the improvement of the design of High fidelity (HF) Radio modems by interpreting the high fidelity radio channel from a signal design perspective. / Thesis (Ph.D.)--University of Adelaide, Dept. of Electrical and Electronic Engineering, 1996?
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Bounds and algorithms for carrier frequency and phase estimationRice, Feng January 2002 (has links)
Quadrature amplitude modulation (QAM) is a highly bandwidth efficient transmission technique for digital communications. It makes use of multiple signal phase and amplitude levels to carry multiple bits per symbol. This requires accurate and robust carrier phase and frequency estimation in the receiver. / Thesis (PhDElectronicEngineering)--University of South Australia, 2002
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Robust wireless communications under co-channel interference and jammingM.M., Galib Asadullah. January 2008 (has links)
Thesis (Ph. D.)--Electrical and Computer Engineering, Georgia Institute of Technology, 2008. / Committee Chair: Gordon L. Stuber; Committee Member: Alfred D. Andrew; Committee Member: John A. Buck; Committee Member: Steven W. McLaughlin; Committee Member: Ye (Geoffrey) Li.
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CMOS RF front-end design of a very narrowband transceiver with 0.18[micrometers]Chen, Chih-Hung, January 2008 (has links)
Thesis (M.S.)--University of Texas at El Paso, 2008. / Title from title screen. Vita. CD-ROM. Includes bibliographical references. Also available online.
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Design and phase noise analysis of CMOS differential and quadrature VCOs /Kubba, Sundus, January 1900 (has links)
Thesis (M. App. Sc.)--Carleton University, 2002. / Includes bibliographical references (p. 97-99). Also available in electronic format on the Internet.
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Feedforward interference cancellation system applied to the 800 MHz CDMA cellular band /Roussel, Alain, January 1900 (has links)
Thesis (M. App. Sc.)--Carleton University, 2003. / Includes bibliographical references (p. 169-175). Also available in electronic format on the Internet.
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Characteristics and performance of various VDSL RFI suppression techniques /Abela, Richard January 1900 (has links)
Thesis (M.App.Sc.) - Carleton University, 2005. / Includes bibliographical references (p. 146-148). Also available in electronic format on the Internet.
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