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Related Concept Videos

Passive Filters01:27

Passive Filters

571
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...
571
Active Filters01:25

Active Filters

885
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:
885
Op Amp AC Circuits01:18

Op Amp AC Circuits

249
Within an audio system, the filter circuit plays a pivotal role in processing the amplified audio signal from an amplifier. Its primary function is significantly attenuating signal components with lower frequencies, thereby shaping the audio output. This circuit's operations are examined, focusing on the fundamental filter configuration. This configuration involves an operational amplifier arranged in an inverting setup coupled with resistors (R1 and R2) and a capacitor (C1).
249
Design Example01:23

Design Example

350
The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...
350
Sound Waves: Interference00:53

Sound Waves: Interference

3.8K
Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...
3.8K
Interference: Path Lengths01:10

Interference: Path Lengths

1.4K
Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...
1.4K

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Circular active noise barrier using theoretical control filter considering interaction between speaker and barrier.

Sanghyeon Lee1, Youngjin Park2

  • 1Korea Advanced Institute of Science and Technology (KAIST), Mechanical Engineering, 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea.

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Summary

This study improved active noise barrier performance by refining theoretical models to account for speaker-barrier interactions. This enhanced noise reduction without real-time adaptation, achieving significant improvements.

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Area of Science:

  • Acoustics
  • Noise Control Engineering
  • Signal Processing

Background:

  • Active noise control (ANC) systems utilize control speakers to reduce noise in a target area.
  • Circular active noise barriers offer a movable solution for noise reduction in dynamic workspaces.
  • Existing theoretical models for ANC barriers often oversimplify speaker-barrier interactions, leading to performance degradation.

Purpose of the Study:

  • To minimize performance degradation in theoretically calculated active noise barriers.
  • To improve the noise reduction performance of circular active noise barriers by refining theoretical models.
  • To investigate the impact of speaker-barrier interaction on ANC system effectiveness.

Main Methods:

  • Development of a refined theoretical model incorporating control speaker-barrier interaction.
  • Implementation of a theoretically calculated control filter without real-time adaptation.
  • Experimental validation of the improved model and ANC system performance.

Main Results:

  • The refined theoretical model significantly reduced the performance gap observed with simplified models.
  • Noise reduction performance was improved by approximately 2.6 dB in the target frequency band.
  • The proposed method demonstrated enhanced effectiveness of active noise barriers.

Conclusions:

  • Accounting for control speaker-barrier interaction is crucial for accurate theoretical modeling of ANC barriers.
  • The refined model enables better prediction and achievement of noise reduction performance.
  • This approach offers a practical solution for enhancing active noise barrier efficiency without complex real-time adaptation.