Sökning: "scalogram"

Hittade 3 uppsatser innehållade ordet scalogram.

  1. 1. Digital Signal Characterization for Seizure Detection Using Frequency Domain Analysis

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

    Författare :Jing Li; [2021]
    Nyckelord :Fourier Transform; Wavelet Transform; EEG and ECG Anomaly Detection; Approximate Entropy; Hellinger Distance; Long Short- Term Memory; Fourier Transform; Wavelet Transform; EEG och ECG Anomalidetektion; Approximativ Entropi; Hellinger Distans; Lång Korttidsminne;

    Sammanfattning : Nowadays, a significant proportion of the population in the world is affected by cerebral diseases like epilepsy. In this study, frequency domain features of electroencephalography (EEG) signals were studied and analyzed, with a view being able to detect epileptic seizures more easily. LÄS MER

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

    Master-uppsats, Lunds universitet/Institutionen för elektro- och informationsteknik

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

    Sammanfattning : 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. LÄS MER

  4. 3. Audio editing in the time-frequency domain using the Gabor Wavelet Transform

    Uppsats för yrkesexamina på avancerad nivå, Centrum för bildanalys

    Författare :Ulf Hammarqvist; [2011]
    Nyckelord :Wavelet transform; time-frequency analysis; audio engineering; signal processing; audio restoration; audio interpolation; pitch-shift; time-stretch; loglet; compression; down-sampling; visualization; fourier transform; convolution; filter bank; digital filters; noise reduction; re-assignment; gabor transform; scalogram;

    Sammanfattning : Visualization, processing and editing of audio, directly on a time-frequency surface, is the scope of this thesis. More precisely the scalogram produced by a Gabor Wavelet transform is used, which is a powerful alternative to traditional techinques where the wave form is the main visual aid and editting is performed by parametric filters. LÄS MER