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Dynamic carrier system for parametric arrays

a carrier system and parametric array technology, applied in the field of parametric array system, can solve problems such as distortion and other audible sound artifacts

Inactive Publication Date: 2003-05-15
AMERICAN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009] a) delaying an audio signal prior to parametrically reproducing the audio signal;

Problems solved by technology

It is also realized that such modulation of the carrier can introduce distortions and other audible sound artifacts, which can be undesirable.

Method used

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  • Dynamic carrier system for parametric arrays
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Embodiment Construction

)

[0040] For the purposes of promoting an understanding of the principles of the invention, reference will now be made to the exemplary embodiment(s) illustrated in the drawings, and set forth in this following detailed description, and specific language will be used to describe the same. It will nevertheless be understood that no limitation of the scope of the invention is thereby intended. Alterations and further modifications of the inventive features illustrated herein, and any additional applications of the principles of the invention as illustrated herein, which would occur to one skilled in the relevant art and having possession of this disclosure are considered within the scope of the invention, which is defined by allowable claims, and is not limited by this exemplary treatment and exposition of the subject matter.

[0041] As discussed above, the invention enables a parametric audio reproduction array system that minimizes the carrier level for a given source material without ...

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Abstract

A system configured to dynamically adjust the ultrasonic carrier level in a parametric array system in response to changing source signal input levels, and which employs a look-ahead delay strategy to enable optimal modulation of the carrier wave to eliminate constant ultrasonic carrier emission and reduce the ultrasonic carrier emission to what is actually needed to accommodate the db range of the source material, and at the same time, to also minimize noticeable distortion and sound artifacts of a high-power ultrasonic carrier, and / or distortion / artifacts arising from modulation of an ultrasonic carrier to reduce average power output; and thus it realizes advantages of carrier modulation based on source-signal level, while minimizing inherent drawbacks of carrier modulation.

Description

[0001] This application claims priority of U.S. provisional application serial No. 60 / 316,720 filed Aug. 31, 2001.SPECIFICATION[0002] 1. Field of the Invention[0003] The invention relates generally to systems, devices and methods for sound reproduction. More specifically, the invention relates to a parametric sound reproduction system wherein economies are realized by dynamically adjusting the ultrasonic carrier level in a parametric array in response to changing input levels of the source audio signal being reproduced in the array.[0004] 2. Related Art[0005] It has been recognized that there are advantages in modulating the output power level, or "envelope" (amplitude modulated or single sideband modulated) of an ultrasonic carrier wave in a parametric loudspeaker system application. This has been known since at least as early as 1991, when the work of Kamakura, Aoki, and Kumamoto was published, as noted below. Modulation of the carrier can provide a more efficient system than usin...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04R3/00G10K15/02
CPCH04R2217/03G10K15/02
Inventor CROFT, JAMES J. IIISPENCER, MICHAEL E.
Owner AMERICAN TECH
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