A computer-implemented method for synchronizing a PPG signal with an ECG signal includes: recording the ECG and PPG signals semi-synchronously; cutting the PPG signal into PPG signal pieces; for a PPG signal piece: determining distances d between a vector of PPG peak times and respective vectors of ECG peak times for respective ECG signal pieces obtained by applying different offsets o; determining a best matching ECG signal piece with minimal distance do; and registering start time x of the PPG signal piece, start time yo of the best matching ECG signal piece, and the minimal distance do; determining an offset and drift between the PPG signal and ECG signal as the offset and slope of a regression model modelling the relation between the start time x and start time yo, inverse weighted by the minimal distance do; applying the offset and drift to the PPG signal.

A computer-implemented method for synchronizing a PPG signal with an ECG signal includes: recording the ECG and PPG signals semi-synchronously; cutting the PPG signal into PPG signal pieces; for a PPG signal piece: determining distances d between a vector of PPG peak times and respective vectors of ECG peak times for respective ECG signal pieces obtained by applying different offsets o; determining a best matching ECG signal piece with minimal distance do; and registering start time x of the PPG signal piece, start time yo of the best matching ECG signal piece, and the minimal distance do; determining an offset and drift between the PPG signal and ECG signal as the offset and slope of a regression model modelling the relation between the start time x and start time yo, inverse weighted by the minimal distance do; applying the offset and drift to the PPG signal.

A system (10) is for performing ECG measurements and comprises a probe (12) with an integrated one or more ECG electrodes (22) and an ultrasound sensing means (18), such as a transducer arrangement. The probe thus provides a mobile ECG electrode which can be sequentially moved between a set of different locations on the body for acquiring ECG measurements from different angles relative to the heart (i.e. different ‘leads’). Positioning of the probe in each required location is guided by a position guidance function which uses ultrasound data acquired by the ultrasound sensing means to locate the probe (with reference to an ultrasound body atlas (28) or map), and uses a stored set of reference body locations to guide a user with guidance information as to how to move the probe to arrive at a next target electrode location. In examples, the user may be guided through a sequence of electrode locations, with ECG data acquired at each one, thereby sequentially building up a set of standard ECG lead measurements.

A weak current signal acquisition circuit, and a seat (10) and a seat cover (100) having the circuit. The weak current signal acquisition circuit uses two signal acquisition units as front input electrodes of an amplification circuit, and uses an in-phase differential input mode, so that the ratio of amplitudes of a differential mode signal sent to a subsequent-stage operational amplifier to a common mode signal is improved, thereby achieving the purpose of improving the signal-to-noise ratio of a weak current signal extracted by a signal acquisition unit. When people use a seat cover (100) in which a weak current signal acquisition circuit is mounted, thighs are in contact with a signal acquisition unit provided on the seat (10), such that the weak current signal acquisition circuit can acquire a human body's electrocardiosignal more effectively.

An electrocardiographic detection device for a vehicle includes: a steering wheel electrode provided at a lower layer of a covering material that covers a surface of a steering wheel; a steering wheel electrode provided at a lower layer of the covering material of the steering wheel and an insulating material of a predetermined thickness; a waveform generator detecting a differential voltage between the steering wheel electrode and a ground region; a waveform generator detecting a differential voltage between the steering wheel electrode and a ground region; and a signal processing section that generates an electrocardiographic signal on the basis of the differential voltage detected at the waveform generator and the differential voltage detected at the waveform generator.

An electrocardiographic detection device for a vehicle includes: a steering wheel electrode provided at a lower layer of a covering material that covers a surface of a steering wheel; a steering wheel electrode provided at a lower layer of the covering material of the steering wheel and an insulating material of a predetermined thickness; a waveform generator detecting a differential voltage between the steering wheel electrode and a ground region; a waveform generator detecting a differential voltage between the steering wheel electrode and a ground region; and a signal processing section that generates an electrocardiographic signal on the basis of the differential voltage detected at the waveform generator and the differential voltage detected at the waveform generator.

A physiological information acquisition device includes: a reception interface configured to receive waveform data corresponding to a measured waveform of a physiological parameter of a subject from a sensor; a notifier configured to output an alarm indicating that the physiological parameter is not normally acquired; a processor configured to cause the notifier to output the alarm based on the waveform data; and a predictor configured to predict, based on the waveform data, a probability that the physiological parameter is erroneously calculated. The processor is configured to cause the notifier to perform a notification of at least one of a quality of the waveform data, a state of the sensor, and an action shall be taken by a user, based on the probability.

Adaptive biosignal systems and methods are disclosed for switching one or more designations of biosignal sensors for dynamic adaptation and optimization of one or more biosignal detection devices. A sensor designation cycle is executed for a plurality of biosignal sensors of a biosignal detection device, each of the plurality of biosignal sensors configured to collect biosignal data of a user, and each of the plurality of biosignal sensors having a designation defining an electrical sensor modality modifiable by a switch communicatively coupled to the biosignal detection device. The plurality of biosignal sensors comprises at least a first biosignal sensor, a second biosignal sensor, and a third biosignal sensor, wherein the first biosignal sensor is designated as a reference sensor, and wherein the second biosignal sensor is designated as a measurement sensor. The sensor designation cycle comprises various algorithms for switching designations of the various sensors.

A method and an apparatus for determining at least one smoothed data point (t.sub.k, s.sub.k) within a stream of data points {t.sub.i, s.sub.i} with 1≤i≤z, k<z is disclosed. Herein, the stream of data points {t.sub.i, s.sub.i} is consecutively acquired in a manner that a data point (t.sub.i, s.sub.i) is acquired after an acquisition of a preceding data point (t.sub.i−1, s.sub.i−1), wherein each data point (t.sub.i, s.sub.i) comprises a valid value or an invalid value or a missing value for the signal s.sub.i at a time t.sub.i. Herein, the signal s.sub.i at the time t.sub.i comprises physical, chemical, biological, environmental, and/or technical data acquired by means of a technical set-up. According to the method, a set of data points is provided, wherein for each smoothed data point (t.sub.k, s.sub.k) a smoothing set is created. For each smoothed data point (t.sub.k, s.sub.k), trailing data resulting from large gaps are removed until it is verified whether the smoothing set comprises a minimal number of data points. Thereafter, for each smoothed data point (t.sub.k, s.sub.k) an initial slope set is calculated, on which at least one exponential smoothing is applied, in which cause an at least once modified slope set is determined. By integrating the at least once modified slope set, a value for the smoothed data point (t.sub.k, s.sub.k) is determined and returned. The method provides a good degree of smoothing without introducing any lag time and with minimal distortions, and is capable of reporting derivatives for the set of smoothed data points at the same time. The method is particularly suited in real-time or nearly real-time measurements which may comprise large gaps within the stream of data points.

A system for providing a standard electrocardiogram (ECG) signal for a human body using contactless ECG sensors for outputting to exiting medical equipment or for storage or viewing on a remote device. The system comprises a digital processing module (DPM) adapted to connect to an array of contactless ECG sensors provided in a fabric or the like. A selection mechanism is embedded into the DPM which allows the DPM to identify body parts using the ECG signals of the different ECG sensors and select for each body part the best sensor lead. The DPM may then produce the standard ECG signal using the selected ECG signals for the different body parts detected. The system is adapted to continuously re-examine the selection to ensure that the best leads are selected for a given body part following a movement of the body part, thereby, allowing for continuous and un-interrupted ECG monitoring of the patient.