Essays about: "discrete short-time fourier transform"

Found 5 essays containing the words discrete short-time fourier transform.

  1. 1. Unsupervised Detection of Interictal Epileptiform Discharges in Routine Scalp EEG : Machine Learning Assisted Epilepsy Diagnosis

    University essay from Uppsala universitet/Avdelningen Vi3

    Author : Shuai Shao; [2023]
    Keywords : EEG; electroencephalography; IED; interictal epileptiform discharges; spike detection; epilepsy; unsupervised; Fourier transform; STFT; short-time Fourier transform; CWT; continuous wavelet transform; DWT; discrete wavelet transform; ML; machine learning; ANN; artificial neural network; CNN; convolutional neural network; autoencoder; HMM; hidden Markov model; ECS; Euclidean distance of cumulative spectrum;

    Abstract : Epilepsy affects more than 50 million people and is one of the most prevalent neurological disorders and has a high impact on the quality of life of those suffering from it. However, 70% of epilepsy patients can live seizure free with proper diagnosis and treatment. Patients are evaluated using scalp EEG recordings which is cheap and non-invasive. READ MORE

  3. 2. On the Short-Time Fourier Transform and Gabor Frames generated by B-splines

    University essay from Institutionen för datavetenskap, fysik och matematik, DFM

    Author : Henrik Fredriksson; [2012]
    Keywords : short-time Fourier transform; time-frequency analysis; Gabor frames; B-splines;

    Abstract : In this thesis we study the short-time Fourier transform. The short-time Fourier transform of a function f(x) is obtained by restricting our function to a short time segment and take the Fourier transform of this restriction. This method gives information locally of f in both time and frequency simultaneously. READ MORE

  4. 3. Nonstationary feature extraction techniques for automatic classification of impact acoustic signals

    University essay from Datateknik

    Author : Yasemi Bekiroglu; [2008]
    Keywords : railway sleepers;

    Abstract : Condition monitoring of wooden railway sleepers applications are generallycarried out by visual inspection and if necessary some impact acoustic examination iscarried out intuitively by skilled personnel. In this work, a pattern recognition solutionhas been proposed to automate the process for the achievement of robust results. READ MORE

  5. 4. A Survey on Methods for Time-Frequency Analysis

    University essay from Blekinge Tekniska Högskola/Institutionen för signalbehandling

    Author : Jan Mark de Haan; [1998]
    Keywords : Signal processing; Time-frequency analysis; Wavelets; Wavelet Packets;

    Abstract : Time analysis and frequency analysis are both well-established ways in engineering to gain more knowledge about a physical phenomena. Time and frequncy analysis can be combinen in a joint time and frequency distribution. READ MORE

  6. 5. A Survey on Methods for Time-Frequency Analysis

    University essay from Blekinge Tekniska Högskola/Institutionen för signalbehandling

    Author : Jan Mark de Haan; [1998]
    Keywords : Signal processing; Time-frequency analysis; Wavelets; Wavelet Packets;

    Abstract : Time analysis and frequency analysis are both well-established ways in engineering to gain more knowledge about a physical phenomena. Time and frequncy analysis can be combinen in a joint time and frequency distribution. READ MORE