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Subject = Signal representation;
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Displaying Results 1  2 of 2 on page 1 of 1
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Convolutive nonnegative matrix factorisation with a sparseness constraint
(2006)
Pearlmutter, Barak A.; O'Grady, Paul D.
Convolutive nonnegative matrix factorisation with a sparseness constraint
(2006)
Pearlmutter, Barak A.; O'Grady, Paul D.
Abstract:
Discovering a representation which allows auditory data to be parsimoniously represented is useful for many machine learning and signal processing tasks. Such a representation can be constructed by nonnegative matrix factorisation (NMF), a method for finding partsbased representations of nonnegative data. We present an extension to NMF that is convolutive and includes a sparseness constraint. In combination with a spectral magnitude transform, this method discovers auditory objects and their associated sparse activation patterns.
http://mural.maynoothuniversity.ie/1375/
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Linear program differentiation for singlechannel speech separation
(2006)
Pearlmutter, Barak A.; Olsson, Rasmus K.
Linear program differentiation for singlechannel speech separation
(2006)
Pearlmutter, Barak A.; Olsson, Rasmus K.
Abstract:
Many apparently difficult problems can be solved by reduction to linear programming. Such problems are often subproblems within larger systems. When gradient optimisation of the entire larger system is desired, it is necessary to propagate gradients through the internallyinvoked LP solver. For instance, when an intermediate quantity z is the solution to a linear program involving constraint matrix A, a vector of sensitivities dE/dz will induce sensitivities dE/dA. Here we show how these can be efficiently calculated, when they exist. This allows algorithmic differentiation to be applied to algorithms that invoke linear programming solvers as subroutines, as is common when using sparse representations in signal processing. Here we apply it to gradient optimisation of over complete dictionaries for maximally sparse representations of a speech corpus. The dictionaries are employed in a singlechannel speech separation task, leading to 5 dB and 8 dB targettointerference ratio improve...
http://mural.maynoothuniversity.ie/1376/
Displaying Results 1  2 of 2 on page 1 of 1
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