Search for dissertations about: "echo"

Showing result 1 - 5 of 182 swedish dissertations containing the word echo.

  2. 1. On System Identification and Acoustic Echo Cancellation

    Author : Per Åhgren; Peter Stoica; Peter Händel; Uppsala universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; acoustic echo cancellation; stereophonic acoustic echo cancellation; doubletalk detection; adaptive beamforming; adaptive filtering; system identification; recursive system identification; loudspeaker impulse response estimation; Signal processing; Signalbehandling;

    Abstract : The topic of acoustic echo cancellation has received a lot of interest over the years. Even though the topic is relatively old, the increasing demand for hands-free telephony has made it more important than ever before. READ MORE

  4. 2. Nuclear Magnetic Resonance for Diffusion Imaging Development and evaluation of spin-echo-based pulse sequences for in vivo studies of water self-diffusion

    Author : Sara Brockstedt; Lund Medicinsk strålningsfysik; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; perfusion fraction; electrocardiographic triggering; segmented EPI SEPI ; echo-planar imaging EPI ; fast spin-echo FSE ; spin-echo SE ; navigator echoes; phase corrections; diffusion; Magnetic resonance; MRI; ischaemic stroke; Medicine human and vertebrates ; Medicin människa och djur ;

    Abstract : The interest in diffusion imaging with nuclear magnetic resonance techniques has increased during the last few years. The main reason is the possibility of early diagnosis of acute ischaemic stroke, at a time when conventional MR techniques and computerised tomography fail. READ MORE

  5. 3. System Modeling Using Basis Functions and Application to Echo Cancelation

    Author : Lester S.H. Ngia; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Laguerre filters; Gauss-Newton algorithms; Levenberg-Marquard algorithms; room acoustics; separable nonlinear least-squares; adaptive filtering; off-line estimation; echo cancelation; on-line estimation; system modeling; neural net filters; Kautz filters; loudspeaker systems; steepest-descent algorithms; Hammerstein models;

    Abstract : This thesis concerns modeling of linear and nonlinear dynamic systems, where the applied models can be described by basis function expansions. In the first part of the thesis, the investigated model (or filter) structures and parameter estimation algorithms are described. READ MORE

  6. 4. Acoustic Noise and Echo Cancelling : Microphone Array Methods and Applications

    Author : Mattias Dahl; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Abstract : This Licentiate thesis is divided into three parts corresponding to three different papers. There is one research report, one conference paper and one submitted journal paper. All three parts deal with acoustic echo and/or noise cancelling problems when using adaptive microphone arrays. READ MORE

  7. 5. A synchronic approach to the Serek ha-Yahad (1QS) : from text to social and cultural context

    Author : Kamilla Skarström Hinojosa; Mikael Winninge; Jutta Jokiranta; Umeå universitet; []
    Keywords : HUMANIORA; HUMANITIES; 1QS; Serek ha-Yahad; Serekh; Yahad; Text linguistics; synchronic; Qumran; Dead Sea Scrolls; Rule texts; René Girard; Scapegoat; social context; cultural context; Hebrew; Second Temple; hierarchy; mimetic violence; discourse analysis; discourse; serek; serekh; covenant; truth; falsehood; text; Micah 6:8; wilderness; community; messianic; law; atone; judge; intertextuality; allusions; quote; echo; intertext; apocalyptic; Hebrew bible.; gamla testamentets exegetik; Old Testament Exegesis;

    Abstract : The purpose of this study is to investigate the social and cultural contexts of 1QS (Serek ha-Yahad) by means of a textual study. The analysis of the text is performed in a synchronic perspective. This means that lexical choices, grammatical forms, references, topics, themes, and intertextuality are analyzed text-internally. READ MORE