... denoise the data so that basic ICA methodscan be used, as discussed in Chapter 13.Part IIIEXTENSIONS AND RELATED METHODSIndependent Component Analysis. Aapo Hyv¨arinen, Juha Karhunen, Erkki ... Thenoise is assumed to be additive. This is a rather realistic assumption, standard infactor analysis and signal processing, and allows for a simple formulation of the noisymodel. Thus, the noisy ... observations . Denotingby a nongaussian random variable, and by a gaussian noise variable of variance, we should be able to express the relation between and in simple algebraic terms. In general,...