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:
Nov. 16, 2004
Filed:
Apr. 02, 2001
Eric J. Clelland, Tempe, AZ (US);
Kenneth S. Wreschner, Chandler, AZ (US);
General Dynamics Decision Systems, Inc., Scottsdale, AZ (US);
Abstract
An active signal suppression system utilizes multi-rate recombinant transmultiplexer ( ) to suppress or cancel an undesired signal ( ) from a wideband composite signal ( ) to be applied to an analog to digital converter ( ). The transmultiplexer ( ) includes a first demultiplexer ( ), multiplier ( ), switch ( ), and multiplexer ( ). The demultiplexer and multiplexer each have a poly phase filter and Fast Fourier Transform pair which permit channelization and facilitate the generation of a cancellation signal ( ) for suppression of the undesired signal. Signal cancellation circuit ( ) receives the composite signal ( ) at one input ( ) and the cancellation signal ( ) at another input ( ). A minimum mean square estimation circuit (MMSE) ( ) and a second demultiplexer ( ) are included in a feedback circuit to provide error correction. A detector and automatic gain control circuit ( ) is coupled to the first demultiplexer ( ) and the multiplier ( ) to detect the undesired signal ( ) for controlling the switch and to provide automatic gain control to a variable gain amplifier ( ) connected to the signal cancellation circuit.