Accession Number : ADD018345
Title : Systolic Multiple Channel Band-Partitioned Noise Canceller.
Descriptive Note : Patent, Filed 21 Jun 91, patented 1 Oct 96,
Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC
Personal Author(s) : Gerlach, Karl R
Report Date : Oct 1996
Pagination or Media Count : 20
Abstract : A novel band partitioned noise cancellation method and device is disclosed. In the invention, in which main and auxiliary channel data is transformed to the frequency domain by FFT's and then associated by frequency subbands. The noise is then cancelled using a sequence of operations including a commutating Gram Schmidt canceller, an equivalent linear weight calculator, formation of a weight matrix, conversion of the weights to time domain by an inverse FFT and rotation of the weights. The weights are then combined with the main and auxiliary channel data in a transversal filter network to produce a noise cancellation residue.
Descriptors : *ELECTROMAGNETIC WAVE FILTERS, *NOISE REDUCTION, *PATENTS, WEIGHTING FUNCTIONS, TRANSVERSE WAVES, FAST FOURIER TRANSFORMS, CANCELLATION, TIME DOMAIN, FREQUENCY DOMAIN
Subject Categories : Electrical and Electronic Equipment
Distribution Statement : APPROVED FOR PUBLIC RELEASE