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Technology Stocks : ATCO -- Breakthrough in Sound Reproduction
ATCO 15.480.0%Mar 28 5:00 PM EST
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To: SunAge who started this subject7/7/2004 5:46:36 PM
From: Savant   of 2062
 
ATCO..another US Patent granted
patft.uspto.gov;

United States Patent 6,760,455
Croft, III , et al. July 6, 2004

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Electrostatic loudspeaker with a distributed filter

Abstract
An electrostatic loudspeaker includes a high resistivity stator with electrode conductivity per square that is constant and/or decreases with distance from the connection point. A contact area of predetermined size is related to the highest frequency of interest. The constant or decreasing surface resistivity of the stators, interacting with the capacitive load of the stator to stator gap, operates as a distributed network such that the active acoustic output is attenuated. in a predetermined manner with increased frequency at all points equidistant on the stator from the connection area. The apparent acoustic source size is reduced as the frequency increases to maintain enhanced dispersion across the operating range of the loudspeaker system.

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Inventors: Croft, III; James J. (Poway, CA); Williamson; Robert C. (La Jolla, CA)
Assignee: American Technology Corporation (San Diego, CA)
Appl. No.: 905634
Filed: July 13, 2001

Current U.S. Class: 381/191; 381/190; 381/173

S.
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