The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 22, 2014
Filed:
Sep. 17, 2011
Peter Davis Poulsen, Grants Pass, OR (US);
Peter Davis Poulsen, Grants Pass, OR (US);
Other;
Abstract
Method and apparatus for converting acoustic energy in an unshifted acoustic signal into an upshifted acoustic signal, and emitting the upshifted acoustic signal. Using a frequency converter, acoustic energy in a first frequency range in the unshifted acoustic signal is converted into acoustic energy in the upshifted acoustic signal in a second frequency range. The upshifted acoustic signal is emitted into an ambient acoustic environment. The second frequency range is higher than the first; the unshifted acoustic signal comprises an unwanted acoustic noise signal. The effect of the acoustic noise signal can be reduced by: enhanced attenuation of upshifted signal during atmospheric propagation; enhanced attenuation of upshifted signal by a non-gaseous attenuating medium; or decreased coupling of upshifted signal into resonances of a human body or mechanical structure.