This paper proposes a multiresolution transform which allows to choose, at eachfrequency, the most appropriate balance between time and frequency resolution according to the signal characteristics and to spec@ goals of the analysis. For the analysis of cardiovascular time series it is proposed to use a resolution in time which changes with frequency according to a parametric sigmoid junction. It results a near constant Q analysis in the central range of frequency and a near constant time-frequency resolution at the extremities. Synthetic and real data obtained from 20 patients during of autonomic tests were analyzed. The ,following results were obtained: at high ,frequency high time resolution is achieved and even short duration components are detected; at low frequency the good ,frequency resolution allows to discriminate among close low frequency components.
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