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reciprocal beat a heartbeat resulting from an atrial or ventricular complex caused by a return of an impulse to its chamber of origin; called also echo beat. sinus beat a heartbeat with sinus rhythm. ventricular beat an ectopic beat originating in a ventricle.
Beat (acoustics) - Mathematics and physics of beat tones. 1  This phenomenon is best known in acoustics or music, though it can be found in any linear system: According to the law of superposition, two tones sounding simultaneously are superimposed in a very simple way: one adds their amplitudes.