1. A noninvasive electrocardiography (ECG) system for identifying and annotating cardiac electrophysiological signals in an ECG waveform as normal or abnormal during measurement of the ECG waveform, comprising: two or more electrodes adapted to be located near a beating heart of a patient and attached to the skin of the patient that receive electrical impulses from the beating heart; a detector that detects the electrical impulses from at least one pair of electrodes of the two or more electrodes and converts the electrical impulses to an ECG waveform for each heartbeat of the beating heart; a processor that receives the ECG waveform for at least one heartbeat from the detector, converts the ECG waveform to a frequency domain waveform, separates the frequency domain waveform into two or more different frequency domain waveforms, and converts the two or more different frequency domain waveforms into a plurality of time domain cardiac electrophysiological subwaveforms and discontinuity points between these subwaveforms of the ECG waveform, compares the plurality of subwaveforms and discontinuity points to a database of subwaveforms and discontinuity points for cardiac electrophysiological signals of ECG waveforms for a plurality of known and normal and abnormal patients, and identifies at least one subwaveform or one or more discontinuity points of the plurality of subwaveforms and discontinuity points as a normal or abnormal electrophysiological signal of the ECG waveform based on the comparison; and a display device that displays the ECG waveform for the at least one heartbeat of the beating heart, displays one or more markers at a location of the at least one subwaveform or one or more discontinuity points on the ECG waveform, and identifies the one or more markers as a normal or abnormal cardiac electrophysiological signal.