Essays about: "short time Fourier transform"

Showing result 1 - 5 of 21 essays containing the words short time Fourier transform.

  1. 1. Interharmonic Analysis of Sustainable Energy Sources and Loads : Comparing two signal processing methods for estimation of interharmonics

    University essay from Högskolan Dalarna/Energiteknik

    Author : Isabelle Löfgren; [2020]
    Keywords : interharmonics; short time Fourier transform; desynchronized processing technique; sliding-window ESPRIT; power quality; signal processing;

    Abstract : In this report, studies on interharmonics from three different measurement sites are performed. The first site is a wind park with three turbines, where the measurements are performed at the point of common coupling of these three. READ MORE

  2. 2. Predictive maintenance with machine learning on weld joint analysed by ultrasound

    University essay from Uppsala universitet/Avdelningen för beräkningsvetenskap

    Author : Adam Hedkvist; [2019]
    Keywords : Machine learning; AI; Ultrasound; Predictive maintenance; Industry 4.0;

    Abstract : Ever since the first industrial revolution industries have had the goal to increase their production. With new technology such as CPS, AI and IoT industries today are going through the fourth industrial revolution denoted as industry 4.0. READ MORE

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

    University essay from KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Author : Sofiane Kerbal; [2019]
    Keywords : 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;

    Abstract : 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. READ MORE

  4. 4. An Application of the Continuous Wavelet Transform to Financial Time Series

    University essay from Lunds universitet/Institutionen för elektro- och informationsteknik

    Author : Klas Eliasson; [2018]
    Keywords : Wavelets; Continuous Wavelet Transform; CWT; Financial Time Series; Currency Trading; Technology and Engineering;

    Abstract : Wavelet theory, which shares fundamental concepts with windowed Fourier analysis, introduces the notion of scale in an effort to aid in joint time-frequency analysis. Having century-old roots, much of the essential research on the subject of wavelets was conducted during the 1970s and 1980s. READ MORE

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

    University essay from Uppsala universitet/Avdelningen för systemteknik

    Author : Hugo Laurell; [2018]
    Keywords : ;

    Abstract : 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. READ MORE