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Related Concept Videos

Discrete Fourier Transform01:15

Discrete Fourier Transform

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The Discrete Fourier Transform (DFT) is a fundamental tool in signal processing, extending the discrete-time Fourier transform by evaluating discrete signals at uniformly spaced frequency intervals. This transformation converts a finite sequence of time-domain samples into frequency components, each representing complex sinusoids ordered by frequency. The DFT translates these sequences into the frequency domain, effectively indicating the magnitude and phase of each frequency component present...
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Parseval's Theorem for Fourier transform01:15

Parseval's Theorem for Fourier transform

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Parseval's theorem is a fundamental principle in signal processing that enables the calculation of a signal's energy in either the time domain or the frequency domain. This theorem is pivotal in demonstrating energy conservation between these two domains, ensuring that the computed energy value remains consistent regardless of the domain of analysis.
To understand Parseval's theorem, it is essential to first comprehend how signal energy is typically calculated. When considering a...
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Fast Fourier Transform01:10

Fast Fourier Transform

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The Fast Fourier Transform (FFT) is a computational algorithm designed to compute the Discrete Fourier Transform (DFT) efficiently. By breaking down the calculations into smaller, manageable sections, the FFT significantly reduces the computational complexity involved. Direct computation of an N-point DFT requires N2 complex multiplications, whereas the FFT algorithm needs only (N/2)log⁡2N multiplications, offering a much faster performance.
The computational efficiency of the FFT becomes...
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Convergence of Fourier Series01:21

Convergence of Fourier Series

226
The Fourier series is a powerful mathematical tool for representing periodic signals as an infinite sum of complex exponentials. In practice, this infinite series is truncated to a finite number of terms, yielding a partial sum. This truncation makes the approximation of the signal feasible but introduces certain challenges, particularly near discontinuities, known as the Gibbs phenomenon.
The Gibbs phenomenon refers to the persistent oscillations and overshoots that occur near discontinuities...
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Discrete-Time Fourier Series01:20

Discrete-Time Fourier Series

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The Discrete-Time Fourier Series (DTFS) is a fundamental concept in signal processing, serving as the discrete-time counterpart to the continuous-time Fourier series. It allows for the representation and analysis of discrete-time periodic signals in terms of their frequency components. Unlike its continuous counterpart, which utilizes integrals, the calculation of DTFS expansion coefficients involves summations due to the discrete nature of the signal.
For a discrete-time periodic signal x[n]...
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Downsampling01:20

Downsampling

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When considering a sampled sequence with zero values between sampling instants, one can replace it by taking every N-th value of the sequence. At these integer multiples of N, the original and sampled sequences coincide. This process, known as decimation, involves extracting every N-th sample from a sequence, thereby creating a more efficient sequence.
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Neural Fourier Energy Disaggregation.

Christoforos Nalmpantis1, Nikolaos Virtsionis Gkalinikis1, Dimitris Vrakas1

  • 1School of Informatics, Aristotle University of Thessaloniki, 54124 Thesssaloniki, Greece.

Sensors (Basel, Switzerland)
|January 22, 2022
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Summary

This study introduces a novel, efficient neural network architecture for energy disaggregation. The new model reduces computational cost and size without sacrificing performance, making it suitable for real-world deployment.

Keywords:
deep learningenergy disaggregationfourierneural fouriernilmnon-intrusive load monitoring

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Area of Science:

  • Artificial Intelligence
  • Machine Learning
  • Energy Systems

Background:

  • Deploying energy disaggregation models in real-world applications faces challenges due to the high computational cost and storage requirements of deep neural networks.
  • Existing deep learning models are often too resource-intensive for edge devices or cost-prohibitive for server-based deployment.
  • Optimizing neural network size and computational efficiency without compromising performance is a significant hurdle.

Purpose of the Study:

  • To propose a novel neural network architecture for energy disaggregation that minimizes learning parameters, reduces model size, and accelerates inference time.
  • To achieve comparable or superior performance to existing state-of-the-art energy disaggregation models.
  • To enable efficient real-world deployment of energy disaggregation technology.

Main Methods:

  • Development of a novel neural network architecture incorporating a parameter-free Fourier transformation.
  • Comparative performance evaluation against two established baseline energy disaggregation models.
  • Analysis of model size, computational cost, and inference speed.

Main Results:

  • The proposed architecture demonstrates a reduction in learning parameters and model size.
  • Fast inference times were achieved without a trade-off in performance.
  • The novel model performed on par with strong baseline models in energy disaggregation tasks.

Conclusions:

  • The developed neural network architecture offers an efficient solution for energy disaggregation.
  • The integration of Fourier transformation is key to achieving reduced computational complexity and size.
  • This approach facilitates the practical, widespread deployment of energy disaggregation models.