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In this contribution, a method for nasalization of speech sounds is proposed based on model-based spectral relations between mouth and nose signals. For that purpose, the mouth and nose signals of speech utterances are recorded simultaneously. The spectral relations of the mouth and nose signals are modeled by pole-zero models. A filtering of non-nasalized speech signals by these pole-zero models yields approximately nasal signals, which can be utilized to nasalize the speech signals. The artificial nasalization can be exploited to modify speech units of a non-nasalized or weakly nasalized representation which should be nasalized due to coarticulation or for the production of foreign words.