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:
Jun. 05, 2012
Filed:
Apr. 09, 2008
Applicant:
James J. Croft, Iii, San Diego, CA (US);
Inventor:
James J. Croft, III, San Diego, CA (US);
Assignee:
LRAD Corporation, San Diego, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03G 5/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A system and method for varying the directionality of an acoustic output of a loud hailing and warning device is disclosed. The method includes the operation of placing a sliding high-pass filter in a signal path of a transducer array having a frequency-dependant dispersion characteristic. A control is provided that varies a lower cutoff frequency of the sliding high-pass filter. The lower cutoff frequency of an electronic audio signal is variably controlled and sent to the transducer array to variably control the directionality of the acoustic output of the loud hailing and warning device.