Sökning: "short-time Fourier transform"

Visar resultat 1 - 5 av 15 uppsatser innehållade orden short-time Fourier transform.

  1. 1. Development of new criteria for train detection and evaluation in critical conditions

    Master-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Författare :Sofiane Kerbal; [2019]
    Nyckelord :railway signaling; train detection; track circuit; shunt; frequency modulation; frequency-shift keying modulation; third-order harmonic; short-time Fourier transform; power spectral density estimation; cross-correlation;

    Sammanfattning : Railway signaling is of paramount importance to ensure traffic management andsafety on the rail network. The main lines are divided into sections called ‘blocks’,which are governed by a fixed signal installation. To prevent trains from colliding,each block allows one train at once. LÄS MER

  2. 2. Time-frequency analysis of THz-time domain spectroscopy data

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Avdelningen för systemteknik

    Författare :Hugo Laurell; [2018]
    Nyckelord :;

    Sammanfattning : This text investigates THz-TDS signals in the time-frequency domain. Addi- tionally this text discusses the prospects of using time-frequency analysis to alleviate distortion in THz spectrographic characterizations induced by back- reflections in the free space electro optic sampling used in the THz time-domain spectroscopy detection scheme. LÄS MER

  3. 3. Stereo-to-Five Channels Upmix Methods, Implementation and Comparative Study

    H-uppsats, Chalmers tekniska högskola/Institutionen för arkitektur och samhällsbyggnadsteknik

    Författare :PANTELEIMON PAPASTERGIOU; [2018]
    Nyckelord :patial audio; spatial enhancenment; upmix; primary ambience extraction; adaptive filtering;

    Sammanfattning : The aim of several 3D audio concepts and products is to create a more immersive, engaging and natural-sounded listening experience. Emerging audio signal process-ing techniques, make it possible for regular stereo recordings to be compatible and reproduced with multichannel home theatre or automotive loudspeaker audio systems. LÄS MER

  4. 4. Corrosion initiation induced by sodium sulfate and sodium chloride particles on Cu and the golden alloy Cu5Al5Zn at simulated atmospheric conditions

    Master-uppsats, KTH/Materialvetenskap

    Författare :Weijie Zhao; [2017]
    Nyckelord :atmospheric corrosion; sodium sulfate; sodium chloride; Cu5Al5Zn; Cu metal; mixed salt pre-deposition; laboratory exposure; LOM; SEM EDS; ATR-FTIR; cathodic reduction;

    Sammanfattning : Effects of sodium sulfate (Na2SO4) particle deposition on the atmospheric corrosion of copper (Cu) metal and a Cu-based alloy (Cu5Al5Zn) used in architectural applications were investigated at laboratory conditions compared with effects induced by sodium chloride (NaCl) and to some extent ammonium sulfate (NH4)2SO4 induced corrosion. Pre-deposited surfaces were exposed to repeated wet/dry conditions in a climatic chamber and the formation of corrosion products were assessed using light optical microscopy (LOM), scanning electron microscopy with elemental analysis (SEM/EDS), Fourier transform infrared techniques (FTIR microscopy) and cathodic reduction (CR). LÄS MER

  5. 5. Onset detection in polyphonic music

    Master-uppsats, KTH/Tal, musik och hörsel, TMH

    Författare :Nils Efraimsson; [2017]
    Nyckelord :Acoustics; onset detection; Musikakustik; ansatsdetektion;

    Sammanfattning : In music analysis, the beginning of events in a music signal (i.e. sound onset detection) is important for such tasks as sound segmentation, beat recognition and automatic music transcription. The aim of the present work was to make an algorithm for sound onset detection with better performance than other state-of-the-art1 algorithms. LÄS MER