Filterbank for spectrally modifying a digital signal and corresponding method

A method for the spectral modification of a digital signal (x (k)) is described in which the signal (x (k)) is filtered with an equivalent time domain filter having an effective sum impulse response by passing the signal through a delay chain (8, 9). with a number of delay stages (4, 5) is passed and a before and / or after the delay chain (8, 9) and / or between the delay stages (4, 5) tapped signal component in each case by a filter unit (6) with a weighted low-pass Prototype impulse response (h (0), ..., h (k), ..., h (n-1)) is passed and the signal components are then summed up again. In addition, a filter bank (1) for the corresponding spectral modification of a digital signal is described.