Search for dissertations about: "time-frequency distribution"

Showing result 1 - 5 of 7 swedish dissertations containing the words time-frequency distribution.

  2. 1. Estimation and Classification of Non-Stationary Processes : Applications in Time-Frequency Analysis

    Author : Johan Brynolfsson; Statistical Signal Processing Group; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Time-Frequency Estimation; Parameter Estimation; Reassignment method; Non-Stationary Processes; Smooth spectral estimation; Neural Networks;

    Abstract : This thesis deals with estimation and classification problems of non-stationary processes in a few special cases.In paper A and paper D we make strong assumptions about the observed signal, where a specific model is assumed and the parameters of the model are estimated. READ MORE

  4. 2. On time-frequency analysis and pseudo-differential operators for vector-valued functions

    Author : Patrik Wahlberg; Joachim Toft; Luigi Rodino; Växjö universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; MATHEMATICS; MATEMATIK;

    Abstract : This thesis treats different aspects of time-frequency analysis and pseudodifferential operators, with particular emphasis on techniques involving vector-valued functions and operator-valued symbols. The vector (Banach) space is either motivated by an application as in Paper I, where it is a space of stochastic variables, or is part of a general problem as in Paper II, or arises naturally from problems for scalar-valued operators and function spaces, as in Paper V. READ MORE

  5. 3. Spectral Analysis for Signal Detection and Classification : Reducing Variance and Extracting Features

    Author : Isabella Reinhold; Statistical Signal Processing Group; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Multifönster; Tids-frekvensanalys; Instantaneous frequency; Multitaper; Signal resolution; Reassignment method; Time-frequency analysis;

    Abstract : Spectral analysis encompasses several powerful signal processing methods. The papers in this thesis present methods for finding good spectral representations, and methods both for stationary and non-stationary signals are considered. READ MORE

  6. 4. Signal processing approaches on otoacoustic emissions

    Author : Jun Cheng; Karolinska Institutet; Karolinska Institutet; []
    Keywords : otoacoustic emissions; signal processing; time-frequency representation; cochlea; outer hair cell; neonatal hearing screening; basilar membrane nonlinearity; bounce phenomenon; spectral estimation; interrelations of OAEs;

    Abstract : The recent achievement on the measurement of otoacoustic emissions (OAEs) is based on a novel technical development of digital signal processing. OAEs measured in the external ear canal are normal by-products of the active process in hearing, which was discovered by Kemp (1978). READ MORE

  7. 5. Quantum interference effects in attosecond photoionization dynamics

    Author : David Busto; Atomfysik; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Attosecond; Photoionization; Interferometry;

    Abstract : The interaction of extreme ultraviolet light with matter can lead to the emission of an electron in a process known as photoionization. The electron wavepacket (EWP) created in the continuum propagates on the ionic potential, resulting in a delay compared to an EWP propagating freely. READ MORE