Electronic Sound Absorber

Olson, Harry F.; May, Everett G.

doi:10.1121/1.1917705

Cited by 46 publications

(50 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…ANC is based on either feedforward control, where a coherent reference noise input is sensed before it propagates past the secondary source, or feedback control [26], [27], where the active noise controller attempts to cancel the noise without the benefit of an "upstream" reference input. Structures for feedforward ANC are classified into 1) broadband adaptive feedforward control with a reference sensor, which will be discussed in Section II, and 2) narrow-band adaptive feedforward control with a reference sensor that is not influenced by the control field (e.g., tachometer), which will be presented in Section III.…”

Section: Paper Outlinementioning

confidence: 99%

Active noise control: a tutorial review

Kuo

Morgan²

1999

Proc. IEEE

1,030

529

View full text Add to dashboard Cite

Active noise control (ANC) is achieved by introducing a canceling "antinoise" wave through an appropriate array of secondary sources. These secondary sources are interconnected through an electronic system using a specific signal processing algorithm for the particular cancellation scheme. ANC has application to a wide variety of problems in manufacturing, industrial operations, and consumer products. The emphasis of this paper is on the practical aspects of ANC systems in terms of adaptive signal processing and digital signal processing (DSP) implementation for real-world applications. In this paper, the basic adaptive algorithm for ANC is developed and analyzed based on single-channel broad-band feedforward control. This algorithm is then modified for narrow-band feedforward and adaptive feedback control. In turn, these single-channel ANC algorithms are expanded to multiple-channel cases. Various online secondary-path modeling techniques and special adaptive algorithms, such as lattice, frequency-domain, subband, and recursive-least-squares, are also introduced. Applications of these techniques to actual problems are highlighted by several examples.

show abstract

Section: Paper Outlinementioning

confidence: 99%

Active noise control: a tutorial review

Kuo

Morgan²

1999

Proc. IEEE

1,030

529

View full text Add to dashboard Cite

show abstract

“…As far as we are aware, active designs for the manipulation of fields appear to have occurred initially in the context of low-frequency acoustics (or active noise cancellation). We perceive the works of Leug [34] (feed-forward control of sound) and Olson & May [43] (feedback control of sound) as pioneering in this field of acoustic control. The reviews [48] [35], [47], [16], [46] [13] provide detailed accounts of past and recent developments in acoustic active control.…”

Section: Related Workmentioning

confidence: 99%

Active manipulation of EM fields in open waveguides

Onofrei

Albanese

2017

Wave Motion

View full text Add to dashboard Cite

The central question addressed in this paper is whether we can introduce an antenna array into a circular cylindrical waveguide to accurately control or determine the local field around the array with vanishingly small reflection from the boundary of the waveguide. We ask this question since we perceive the answer to be important to the applied community through its relevance for applications to electromagnetic shielding or slot antennas. We make use of the results presented in [44] for the scalar Helmholtz equation and show, by using the Debye representation in waveguides, how they apply to the current EM waveguide model. We prove the existence of a class of solutions and include a feasibility discussion for the antenna synthesis problem together with relevant simulations.

show abstract

“…The concept of noise reduction based on acoustic interference effect is first put forward by Rayleigh, while German physicist Lueg fabricates a real device which is published as one US patent and one paper [6]. Olson and May, two engineers in RCA company laboratory, provide an electronic speaker seen as an active noise control system [7]. By using a feedback control system, Olson and May put this device in the seat above the back of a chair to reduce the noise of the person nearby.…”

Section: Introductionmentioning

confidence: 99%

Portable Low-Frequency Noise Reduction Device for Both Small Open and Closed Spaces

Wang

Gao

Long

et al. 2016

Shock and Vibration

View full text Add to dashboard Cite

Noise pollution has been given more attention due to its negative impacts on human health and disease. The portable low-frequency noise reduction device we developed in this research can provide an effective way for solving low-frequency noise pollution problem in the small space. This work describes the design principle and the prototype structures for two versions of V1.5 and V2.0 and builds the noise test systems for small spaces, respectively. These devices, installed on the outer surface of the small spaces, can automatically identify the noise spectrum and implement noise reduction by means of the active noise control (ANC) technology. The testing results indicate that the noise can be reduced 12 dB in the range of 250 Hz~400 Hz for the small closed space while, for the small open space, the best effect of 5.88 dB occurs in the optimal frequency of 450 Hz. These effects will be weakened with the increasing distance away from the source and show the obvious axisymmetric distribution in the inverted cone space.

show abstract

Electronic Sound Absorber

Cited by 46 publications

References 0 publications

Active noise control: a tutorial review

Active noise control: a tutorial review

Active manipulation of EM fields in open waveguides

Portable Low-Frequency Noise Reduction Device for Both Small Open and Closed Spaces

Contact Info

Product

Resources

About