Efficientadaptivefilteringalgorithmsthatexploitthesparsityinthetransformdomainsarepresentedandtherelationbetweenthesignal-andthesystem-basedsparserepresentationsisemphasized.Thepresentedapproachinthisbooktoacousticechosuppressioncopesasafirstofitskindwithhighlycorrelatedloudspeakersign