Passive Noise | ScienceGate

The impedance of a passive noise control device is strictly positive real, if the device is installed in noise fields with weak mean flows. Passive noise control devices are, therefore, more reliable than active ones. Active control may be applied to a Helmholtz resonator to introduce electronic resonance. It will affect the impedance Zact of the resonator. A controller may be designed such that (a) Zact is small and resistive at some tunable frequencies; and (b) Re{Zact}⩾0 in the entire frequency range of interest. If criterion (a) is satisfied, the active resonator can suppress duct noise at tunable frequencies. It is difficult to design a controller to satisfy criterion (b) because parameters of the controller depend on acoustic parameters of the noise field. A new method is proposed here to design an active controller to meet both criteria simultaneously. The satisfaction of criterion (b) implies a positive real Zact and a robust active resonator with respect to parameter variation in the noise field. Experimental results are presented to verify the performance of the active resonator.

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Untersuchung der Regelwerke für den passiven Schallschutz unter Berücksichtigung aktueller Verkehrslärmspektren – Teil 1

Lärmbekämpfung ◽

10.37544/1863-4672-2020-01-19 ◽

2020 ◽

Vol 15 (01) ◽

pp. 17-21

Author(s):

J. Weinzierl ◽

W. Wieland

Keyword(s):

Correction Term ◽

Spectral Composition ◽

Sound Insulation ◽

Assessment Procedure ◽

Noise Sources ◽

Frequency Dependent ◽

Protection Goal ◽

Passive Noise ◽

Sound Reduction ◽

Spectrum Adaptation

In den Regelwerken zum passiven Schallschutz von Umfassungsbauteilen wird das erforderliche Schalldämm-Maß der Fassade als Einzahlwert entsprechend dem Bewertungsverfahren nach DIN EN ISO 717-1 [1] ermittelt. Um die spektrale Zusammensetzung verschiedener Lärmquellen und die frequenzabhängige Schalldämmung von Fassadenbauteilen zu berücksichtigen, werden in den einschlägigen Regelwerken Korrektursummanden bzw. Spektrum-Anpassungswerte verwendet. Im folgenden Beitrag wird der Einfluss verschiedener Außenlärmspektren und frequenz- abhängiger Schalldämm-Maße auf den Innenpegel diskutiert. Insbesondere werden die Unterschiede zwischen Holz- und Massivbauweise bezüglich des Schutzziels bzw. des Innenpegels betrachtet. Die Untersuchungen zeigen, dass keine generelle Differenzierung zwischen Leicht- und Massivbauweise erforderlich ist. Für hochschalldämmende Leichtbaukonstruktionen mit einem Ctr,50–5000 < –8 dB wird jedoch ein Korrekturterm für das erforderliche Fassaden-Schalldämm-Maß zur Sicherstellung des Schutzziels vorgeschlagen.     Summary In the regulations for passive noise protection of surrounding components, the required sound reduction index of the facade is determined as a single value according to the assessment procedure according to DIN EN ISO 717-1 [1]. In order to take into account the spectral composition of different noise sources and the frequency-dependent sound insulation of facade components, correction summands or spectrum adaptation values are used in the relevant regulations. The following article discusses the influence of various outside noise spectra and frequency-dependent sound insulation measures on the inside level. In particular, the differences between wood and solid construction were considered with regard to the protection goal and the internal level. The investigations show that no general differentiation between lightweight and solid construction is necessary. For highly sound-insulating lightweight constructions with a Ctr, 50–5000 <-8 dB, however, a correction term for the required facade soundproofing dimension to ensure the protection goal is proposed.                              

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Hybrid active and passive noise control in ventilation duct with internally placed microphones module

Applied Acoustics ◽

10.1016/j.apacoust.2021.108525 ◽

2022 ◽

Vol 188 ◽

pp. 108525

Author(s):

Lifu Wu ◽

Lei Wang ◽

Shuaiheng Sun ◽

Xinnian Sun

Keyword(s):

Noise Control ◽

Passive Noise ◽

Ventilation Duct

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A 2.4-mW 25-MHz BW 300-MS/s passive noise shaping SAR ADC with noise quantizer technique in 14-nm CMOS

2017 Symposium on VLSI Circuits ◽

10.23919/vlsic.2017.8008491 ◽

2017 ◽

Cited By ~ 7

Author(s):

Ying-Zu Lin ◽

Chih-Hou Tsai ◽

Shan-Chih Tsou ◽

Rong-Xing Chu ◽

Chao-Hsin Lu

Keyword(s):

Sar Adc ◽

Noise Shaping ◽

Passive Noise

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Passive noise datasets at regolith sites

Data in Brief ◽

10.1016/j.dib.2018.08.055 ◽

2018 ◽

Vol 20 ◽

pp. 735-747 ◽

Cited By ~ 5

Author(s):

Bambang Setiawan ◽

Mark Jaksa ◽

Michael Griffith ◽

David Love

Keyword(s):

Passive Noise

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On the Passive Noise Control of the Flow-Induced Noise Using Porous Materials

10.1115/1.0004590v ◽

2021 ◽

Author(s):

Reon Nishikawa ◽

Osamu Tershima ◽

Ayumu Inasawa

Keyword(s):

Porous Materials ◽

Noise Control ◽

Flow Induced Noise ◽

Passive Noise

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Background Noise Removal Technique using Deep Learning Segmentation Network without Segmentation Map

INTER-NOISE and NOISE-CON Congress and Conference Proceedings ◽

10.3397/in-2021-2705 ◽

2021 ◽

Vol 263 (2) ◽

pp. 4441-4445

Author(s):

Hyunsuk Huh ◽

Seungchul Lee

Keyword(s):

Deep Learning ◽

Background Noise ◽

Ground Truth ◽

Noise Removal ◽

Industrial Manufacturing ◽

Proposed Model ◽

Audio Data ◽

Passive Noise ◽

Removal Technique ◽

Noise Canceling

Audio data acquired at industrial manufacturing sites often include unexpected background noise. Since the performance of data-driven models can be worse by background noise. Therefore, it is important to get rid of unwanted background noise. There are two main techniques for noise canceling in a traditional manner. One is Active Noise Canceling (ANC), which generates an inverted phase of the sound that we want to remove. The other is Passive Noise Canceling (PNC), which physically blocks the noise. However, these methods require large device size and expensive cost. Thus, we propose a deep learning-based noise canceling method. This technique was developed using audio imaging technique and deep learning segmentation network. However, the proposed model only needs the information on whether the audio contains noise or not. In other words, unlike the general segmentation technique, a pixel-wise ground truth segmentation map is not required for this method. We demonstrate to evaluate the separation using pump sound of MIMII dataset, which is open-source dataset.

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Gesetzgeberische Handlungsspielräume zur Stärkung des aktiven Schallschutzes im Luftverkehrsrecht

10.5771/9783748924258 ◽

2021 ◽

Author(s):

Sabine Schlacke ◽

Dominik Römling ◽

Daniel Schnittker

Keyword(s):

International Law ◽

Land Use Planning ◽

Regional Planning ◽

Air Traffic ◽

Urban Land Use ◽

Noise Abatement ◽

Active Noise ◽

Sectoral Planning ◽

Definition Of ◽

Passive Noise

Air traffic law deals with noise emissions primarily by means of passive noise protection. Active noise abatement, which starts at the source of emissions, is not given precedence in air traffic approval procedures. The study examines how the legal basis for aviation licensing and for the definition of flight procedures can be strengthened with regard to active noise abatement measures. To this end, it analyzes the scope for action under constitutional, Union and international law and considers all relevant planning levels, including regional planning, urban land use planning and sectoral planning.

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