Michael J Spencer

US Patent:

6584205, Jun 24, 2003

Filed:

Aug 26, 1999

Appl. No.:

09/384084

Inventors:

Michael E. Spencer - Redondo Beach CA
Joseph O. Norris - Ramona CA

Assignee:

American Technology Corporation - San Diego CA

International Classification:

H03G 500

US Classification:

381 98, 381103

Abstract:

A parametric loudspeaker system using improved modulators to compensate for the non-linearity of the parametric process in air when driving the air at saturation levels and below saturation levels. The parametric loudspeaker uses a pre-processed single sideband modulator that offers ideal linearity as characterized by square root pre-processed double sideband modulators but with a lower carrier frequency and without the wide bandwidth requirements. By eliminating some or all of the lower sideband the carrier frequency can be reduced without producing sideband frequencies in the audible range. Lower operational frequencies result in greater translation efficiency and greater output capability before reaching the saturation limit of air. A pre-processor minimizes the effects of saturation limits for double sideband, truncated double sideband or single sideband processing to achieve superior output.

US Patent:

7224808, May 29, 2007

Filed:

Sep 3, 2002

Appl. No.:

10/234958

Inventors:

Michael E. Spencer - Redondo Beach CA, US

Assignee:

American Technology Corporation - San Diego CA

International Classification:

H04B 3/00
H04B 1/02

US Classification:

381 77, 381106, 367137

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.

US Patent:

20180374647, Dec 27, 2018

Filed:

Jun 27, 2018

Appl. No.:

16/020503

Inventors:

- CYPRESS CA, US
SCOTT A. ELDRIDGE - CYPRESS CA, US
NATHAN ZAMEROSKI - CYPRESS CA, US
THOMAS J. EDWARDS - CYPRESS CA, US
MICHAEL S. SPENCER - CYPRESS CA, US

Assignee:

SCIENTIFIC APPLICATIONS & RESEARCH ASSOCIATES, INC. - CYPRESS CA

International Classification:

H01G 4/33
H01G 4/018
H01G 4/232

Abstract:

A novel metallized film capacitor is contemplated. The capacitor includes a first film and a second film. Each of the first film and second film have a metallized layer added. Each of the metallized layers includes alternating metallized sections and margin sections. The outermost sections on one film are metallized sections, while the outermost sections on the other film are margin sections. This pattern and proper sizing of the sections creates overlap regions where a metallized section from one film overlaps a metallized section from the other film. These overlap regions create sub-capacitors that give the capacitor low inductance while allowing for high current and high voltage.