DSL NOISE CANCELLATION

World Intellectual Property Organization Patent

APP PUB NO WO-2010101568-A1
SERIAL NO

PCTUS2009036076

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Abstract

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A method and apparatus in a noise cancellation system that receives a noise reference signal via a noise reference signal input port, and performs at least one of procedures a and b set forth below for reducing noise in a DSL data signal transmitted on a DSL transmission line to which the noise cancellation system is coupled: a.i.) creating a noise free representation of a DSL synchronization symbol repeatedly occurring in the transmitted DSL data signal, and a.ii.) reducing the noise in the transmitted DSL data signal based on the noise free representation of the DSL synchronization symbol and the received noise reference signal, and b.i.) analyzing at least one of the received noise reference signal and the transmitted DSL data signal to identify one or more frequency bands in which to de-emphasize noise cancellation in the transmitted DSL data signal, and b.ii.) causing the noise cancellation system to de-emphasize noise cancellation in the identified one or more frequency bands of the transmitted DSL data signal, responsive to the analysis.

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Patent Owner(s)

Patent OwnerAddress
ADAPTIVE SPECTRUM & SIGNALUSCALIFORNIA USA

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Inventor(s)

Inventor Name Address
CIOFFI JOHN M ATHERTON CA
MOHSENI MEHDI 806 COLEMAN AVENUE APT 24 MENLO PARK CA 94025 US
BRADY MARK EAGLE LAKE FL
MALLORY MARK 3325 NE 52ND PORLAND OREG
FLOWERS MARK B LOS GATOS CA

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