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One good example is the successful application of ANC on Apple's iPhone 5 to increase speech quality in communication by cancelling ambient noise. However, applications of the technology are entering a new golden era with greater numbers of companies investigating the applications of noise control in their products.
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The fundamental theories and methods of active noise control (ANC) have become well established over the last 30 years, so fewer academic research projects on ANC are funded nowadays. These include the public's perception of what actually constitutes a noise nuisance and also critically the rate at which an expanding commercial fleet transitions to newer quieter aircraft.Ī new era for applications of active noise control Qiu, Xiaojun (1), Lu, Jing (2), Pan, Jie (3) This is only a part of the complex jigsaw of issues however which define the aircraft noise problem. This forms the basis for noise certification metrics and the focus of industry efforts to reduce aircraft noise. Much of the discussion will revolve around measures of the noise of a single aircraft at takeoff or approach. Areas will also be highlighted where future gains are likely. The main sources of aircraft noise will be reviewed and areas identified in which the greatest noise reductions have been achieved. While much has been achieved, opportunities still exist to exploit further significant reductions in noise both for current aircraft layouts but also in the longer term for future aircraft and engines which may differ significantly from current configurations. These remarkable achievements will be reviewed here, and an assessment presented of current progress towards meeting ambitious new environmental targets for aircraft entering service between now and 2050. The technical progress which has been made during this period in reducing aircraft noise at source and mitigating its effects by noise reduction technologies is not widely understood or appreciated by the community. It has been a critical issue for communities living close to airports since the introduction of turbojet and turbofan powered aircraft in civil aviation in the late 1960s and early 1970s. Meeting community expectations on aircraft noise has always presented a challenge to aircraft and engine manufacturers and to those involved in airport planning and air traffic management. Institute of Sound and Vibration Research, University of Southampton, United Kingdom The novel paradigm for sound field control systems, the Sound of Things, is introduced with a sound sketch interface devised to facilitate gesture-based interaction between a person and a sound field.Ĭan technology deliver acceptable levels of aircraft noise? Astley, R Jeremy The underlying array signal processing theories, developed since 2000, are introduced in regard to practical systems implemented for various applications. In addition to focusing sound fields, it is possible to control a sound wavefront to produce virtual sound sources with various radiation patterns in a source-free space. Through the shaping of sound in space, sound fields can be focused over a selected area to form a personal sound zone within which a person hears only a specified sound program without being disturbed by other unwanted programs. In this lecture, two representative problems related to sound shaping are presented: the synthesis of a personal sound zone, and the manipulation of virtual sound sources. Sound sketching involves reproducing existing sound fields as well as creating new shapes of sound fields that can scarcely be observed in common acoustical spaces. By extending the concepts of active noise control and zones of quiet, one can sketch sound, i.e., synthesize sound fields of various shapes using loudspeaker arrays to achieve the desired sound quality in a finite zone of interest.
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The control of the spatial distribution of noise and sound has been widely investigated for achieving passive and active noise control. INTERNOISE2014 Themes Papers Sound Sketch: Shaping sound in space and time using loudspeaker arrays Choi, Jung-Woo