Sökning: "discrete wavelet transform"

Visar resultat 1 - 5 av 25 uppsatser innehållade orden discrete wavelet transform.

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

   Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Avdelningen Vi3

   Författare :Shuai Shao; [2023]
   Nyckelord :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;

   Sammanfattning : 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. LÄS MER

3. 2. Towards a Data-Driven Approach to Ground-Fault Location in Distribution Power System using Artificial Neural Network

   Master-uppsats, Linnéuniversitetet/Institutionen för fysik och elektroteknik (IFE)

   Författare :Antoine Dupuis; [2021]
   Nyckelord :Ground-Fault Location; Distribution power System; Artificial Neural Network; Machine Learning; Distributed Generation; Wavelet Transform;

   Sammanfattning : Motivated by the need for less polluting energy production, the recent increase in renewable electricity production is reshaping classical power systems. Initially unidirectional and constant power flow becomes multi-directional and dynamic. As one of the many consequences, classical power system fault location methods might become outdated. LÄS MER

4. 3. Development of Neural Networks Using Deterministic Transforms

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

   Författare :Pol Grau Jurado; [2021]
   Nyckelord :Multilayer neural network; deterministic transforms; weight matrices; computational cost; machine learning.; Neurala nätverk i flera lager; deterministiska transformationer; viktmatriser; beräkningskostnad; maskininlärning.;

   Sammanfattning : Deep neural networks have been a leading research topic within the machine learning field for the past few years. The introduction of graphical processing units (GPUs) and hardware advances made possible the training of deep neural networks. Previously the training procedure was impossible due to the huge amount of training samples required. LÄS MER

5. 4. The Discrete Wavelet Transform

   Master-uppsats, Mälardalens högskola/Akademin för utbildning, kultur och kommunikation

   Författare :Wirén Anton; [2021]
   Nyckelord :Wavelet theory; multiresolution analysis; image processing.;

   Sammanfattning : In this thesis we will explore the theory behind wavelets. The main focus is on the discrete wavelet transform, although to reach this goal we will also introduce the discrete Fourier transform as it allow us to derive important properties related to wavelet theory, such as the multiresolution analysis. LÄS MER

7. 5. Detection of Human Emotion from Noise Speech

   Master-uppsats, Blekinge Tekniska Högskola/Institutionen för tillämpad signalbehandling

   Författare :Sai Chandra Sekhar Reddy Nallamilli; Nihanth Kandi; [2020]
   Nyckelord :Neural Network; Activation Function; Fast Fourier Transform; Karhunen-Loeve Transform; speech enhancement; filtering; Wavelet Transform; Speech preprocessing; signal to noise ratio; shallow neural network;

   Sammanfattning : Detection of a human emotion from human speech is always a challenging task. Factors like intonation, pitch, and loudness of signal vary from different human voice. So, it's important to know the exact pitch, intonation and loudness of a speech for making it a challenging task for detection. LÄS MER