Sökning: "echo"

Visar resultat 21 - 25 av 191 avhandlingar innehållade ordet echo.

  1. 21. Investigations of Issues Relevant to the Application of Photon Echoes in Information Technology

    Författare :Ulf Elman; Atomfysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; nonlinear optics; fibre amplifier; Boolean operation; rare earth metals; Atom- och molekylärfysik; Atomic and molecular physics; optical processing; photon echo; optical storage; Fysicumarkivet A:1998:Elman;

    Sammanfattning : Photon echoes have been studied both experimentally and theoretically, with the main part of the work centred around the concept of using photon echoes for all-optical data storage and processing. The four basic Boolean operators, AND, OR, NOT and XOR have been experimentally demonstrated using photon echoes. LÄS MER

  3. 22. Speech Signal Extraction : A Multichannel Approach

    Författare :Nedelko Grbic; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Speech Enhancement; Blind signal separation; Echo control; Adaptive systems;

    Sammanfattning : In speech signal extraction the aim is to extract human speech in a physical environment by using microphones. In any real world environment there are many disturbance sources that cause unwanted sound pressure, which in turn may degrade the comprehension of the speech at the microphones. LÄS MER

  4. 23. Analysis of relaxation time measurements with spin-echo magnetic resonance imaging : A study of selected clinical protocols

    Författare :Annette Fransson; Stockholms universitet; []
    Nyckelord :;

    Sammanfattning : .... LÄS MER

  5. 24. Characterisation of powder cellulose, microcrystalline cellulose and porous cellulose beads : application of 13 C CP/MAS and spin echo NMR techniques

    Författare :Ragnar Ek; Uppsala universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; PHARMACY; FARMACI;

    Sammanfattning : .... LÄS MER

  7. 25. Low-Complexity Adaptive Filtering for Acoustic Echo Cancellation in Audio Conferencing Systems

    Författare :Christian Schüldt; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : With the globalization of the world’s economy, the demand for effortless, quick and efficient communication is increasing. Modern audio conferencing allows people at different locations to have a conversation as if they were sitting in the same room, without having to travel. LÄS MER