Noise Cancellation Technologies, Inc.

New Transducers Limited

David Claybaugh

Jeffrey N Denenberg

Sean O'Brien

Michael J Parrella

Thomas Lundie

John K Conley

Michael A Hayes

John Hohman

Ralph Busch

Zeev Kitov

A thin loudspeaker is provided that produces a superior frequency response and a diffuse acoustical pattern using magnetic drivers, acoustical plates, or a combination of magnetic drivers and acoustical plates. The invention contains a specially designed crossover network and a novel enclosure design. The novel enclosure includes a septum and cross bracing which enables the invention to realize superior performance in a thin loudspeaker design. The invention encompasses methods for improving the performance of an acoustical plate which include (1) placing acoustical plate motor elements on the plate in a manner that avoids rotational, mirror, and translational symmetry, (2) using acoustical plate motor elements of different shapes and sizes to stimulate the plate, and (3) using an acoustical plate that has an asymmetric shape. All of the embodiments of the invention may be covered with a decorative cover and hung on a wall like a picture or used to form a panel in a home entertainment center.

Thin Loudspeaker

A decorative speaker cover is disclosed that transforms any loudspeaker into a work of art. The decorative speaker cover of the invention consists of a sheet of material stretched across and adhered to a support frame. The sheet of material contains an artistic work like a picture, design, custom photograph, print, etc. The invention also includes methods for attaching the decorative speaker covers to a loudspeaker cabinet. The disclosed methods allow speaker covers to be readily changed.

Decorative speaker cover

An active plus selective headset system for provision of active attenuation of broadband noise as well as speech filtering comprising a headset with reference microphones, residual microphones and speakers on each of a pair of open backed muffs and a controller means.

Active plus selective headset

Hands free noise canceling headset

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Baltimore, MD, United States of America

David Claybaugh