An appropriate investigation of quadratic phuw conplings (QPC) in non-stationary Signals requires (inie-\'iiruint methods ofbispectral anulysis. A wir approach for tiine-variant estimation of power spcctrntn and bispectnun bascd on an adaptively, recnr-.vnv/v estimated Fourier transfonn (ADFT) is presenied in this paper. A rednced calculation effort and the possibility of the calculation of the bispectnun for selected frequency triples are important advantages of this method. Becaitse of the recursive calculation, the ADFT is convenient for analysing ongoing Signals. This will he demonstrated for sinmlated and real biomedical Signals.
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