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Related Concept Videos

Active Filters01:25

Active Filters

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Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is:
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Downsampling01:20

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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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Passive Filters01:27

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Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources.
Low-Pass Filters
Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff...
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Upsampling01:22

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Managing signal sampling rates is essential in digital signal processing to maintain signal integrity. A decimated signal, characterized by a reduced frequency range due to its lower sampling rate, can be upsampled by inserting zeros between each sample. This upsampling process expands the original spectrum and introduces repeated spectral replicas at intervals dictated by the new Nyquist frequency. To refine this zero-inserted sequence, it is passed through a lowpass filter with a cutoff...
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Feedback control systems

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Feedback control systems are categorized in various ways based on their design, analysis, and signal types.
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The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
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Multirate Audio-Integrated Feedback Active Noise Control Systems Using Decimated-Band Adaptive Filters for Reducing

Antonius Siswanto1, Cheng-Yuan Chang1, Sen M Kuo1

  • 1Department of Electrical Engineering, Chung Yuan Christian University, Taoyuan 32023, Taiwan.

Sensors (Basel, Switzerland)
|November 26, 2020
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Summary
This summary is machine-generated.

This study introduces a multirate audio-integrated feedback active noise control (AFANC) system. It significantly reduces computational complexity for real-time applications by using decimated-band adaptive filters.

Keywords:
audio-integratedfeedback active noise controlmultiratenoise control

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Area of Science:

  • Acoustics
  • Signal Processing
  • Control Systems

Background:

  • Conventional Audio-Integrated Feedback Active Noise Control (AFANC) systems require high sampling rates for fullband adaptive filters, leading to high computational complexity.
  • This complexity makes real-time implementation of AFANC systems challenging.

Purpose of the Study:

  • To propose a novel multirate AFANC system that reduces computational complexity.
  • To enable practical real-time implementation of AFANC systems with improved efficiency.

Main Methods:

  • Implementation of a multirate AFANC system utilizing decimated-band adaptive filters (DAFs).
  • Development of a decimated filtered-X least mean square (FXLMS) algorithm for updating the adaptive ANC filter.
  • Introduction of on-line and off-line decimated secondary-path modeling algorithms for the audio cancelation filter.

Main Results:

  • Significant decrease in computational complexity compared to conventional single-rate systems.
  • Demonstrated good noise reduction performance.
  • Achieved fast convergence speed for the adaptive filters.
  • Successful real-time implementation and testing on an active headrest system.

Conclusions:

  • The proposed multirate AFANC system effectively reduces computational load.
  • The system offers a practical solution for real-time noise cancellation with audio delivery.
  • The approach is validated through simulations and real-time experiments.