To address these limitations, we have developed a novel DRT-constrained acquisition method using FFT that accommodates arbitrary input currents. Our approach achieves both improved DRT recovery and impedance reconstruction compared to existing pulse-based methods , while significantly reducing computational time. In particular, for pseudorandom binary sequence (PRBS) signals, our method demonstrated a 27-fold reduction in processing time compared to conventional time-domain pulse DRT analysis . The method's versatility extends beyond pulse-derived waveforms and is validated with continuous and discontinuous DRTs, as well as artificial battery data.