Appts. determining non-pulse-related information part in cardiac data signal - filters impedance or pressure signal during measurement time when pulse period is constant producing intermediate signal

摘要

The momentary value of the intermeidate signal represents an average value out of like-phased signal values of several pulse periods of the data signal. A subtraction stage (19) takes the intermediate signal from the measured data signal to produces a difference signal. A time window (21) and an evaluating state (23) determine the non-pulse-related data signal dependent upon the difference signal. The commencement of the time window and the timed alteration of the intermediate signal are determined, the time window only being started when the timed alteration of the preceding intermediate signal to the extreme value assumes a predetermined level. ADVANTAGE - Control of frequency adaptation of cardiac pace-maker.