[Selector of R wave of electro-cardiosignals with increase of the amplitude by the slope]

The given selector of R waves selects a signal from a combination of electrocardiosignals and jamming on the basis of computing the product of the amplitude of positive overshoots by the slope of their posterior fronts and comparison of the magnitude derived with an automatically changing threshold. The selector is comparatively unsophisticated in use, is highly jamproof and has a good speed of response. It is desirable that it may be used in cardiological devices working in conditions of motor activity of man.