Siemens Aktiengesellschaft

Siemens Elema Ab

Lena Lundstrom

Peter Karlsson

Thomas Ohlsson

Martin Stridh

A computerized apparatus for processing a multi-lead ECG beat signal to generate a residual signal has an averager unit for providing a template ventricular beat signal, and a subtraction unit for subtracting the template beat signal from the multi-lead ECG beat signal to generate the residual signal. An alignment stage is disposed before the subtraction unit and compares the template beat signal with an intermediate beat signal in the alignment parameter generator. A further subtraction unit may be provided to receive the multi-lead ECG beat signal and to subtract a signal representative of an estimated atrial signal therefrom to generate the intermediate beat signal. The alignment stage also modifies the template beat to increase the relative alignment of the two signals, with respect to at least spatial, characteristics, and emits the modified signal as an output for use by the subtraction unit as the template beat signal.

Electrocardiogram signal processing apparatus

In a method for correcting for non-physiological variations in ECG signals, signals recorded during a heartbeat, or a characteristic part of a heartbeat, are conditioned and digitized. Signal samples are stored in the form of an m.times.p matrix, where m is the number of samples and p is the number of leads used from measuring electrodes applied to the patient. The difference between this measuring matrix and a reference matrix is minimized by performing one or more of the operations translation, time synchronization, rotation and scaling of the measuring matrix. An apparatus for correcting for non-physiological variations in ECG signals includes a stage for conditioning signals, picked up by measuring electrodes applied to the patient, an A/D converter for digitizing the signals and a calculation unit. The calculation unit includes a storage unit for storing signal samples in the form of a m.times.p matrix, where m is the number of samples and p is the number of leads used from measuring electrodes applied to the patient, and for storing a reference matrix. The calculation unit is arranged to minimize the difference between the measuring matrix, formed from signal samples, and the reference matrix by one or more of the operations of translation, time synchronization, rotation and scaling of the measuring matrix.

Method and apparatus for correcting non-physiological variations in ECG

Method and device for filtering out baseline fluctuations from an

Device for filtering out baseline fluctuations from physiological

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Stockholm, Sweden

Lena Lundstrom