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Example of labeling fixed-length data. (A) Waveform for one heartbeat (Single fetal heartbeat). (B) Non-periodic and transient signals (Artifacts). (C) Overlap with two heartbeat waveforms (multiple heartbeats). (D) Low amplitude and no characteristic behavior signal (Low-level signal). The amplitude of the acquired DUS signal was normalized to be within the 1 to 1 range.
