EcgDevice Class

ECG Device class implemets methods for using universal sensors as cardiography system.

Android

ru.neurotech.neurodevices.ecg

Class EcgDevice

Related Classes

ru.neurotech.neurodevices.ecg.EcgDeviceConnector

ru.neurotech.neurodevices.ecg.RPeak

ru.neurotech.neurodevices.NeuroDevice

Classes hierarchy

• java.lang.Object
• ru.neurotech.common.VisualizableDevice
• ru.neurotech.neurodevices.ecg.EcgDevice

Class definition

public class EcgDevice extends VisualizableDevice

Fields Summary

Modifier and Type	Field and Description
SubscribersNotifier<java.lang.Boolean>	electrodesAttachedStateChanged Notifies when electrodes are attached or detached To get electrodes state manually use getElectrodesState
SubscribersNotifier<java.lang.Double>	totalSignalDurationChanged Notifies subscribers when signal duration is changed, when new samples received or data been loaded from external storage, or buffers been reset

Fields inherited from class ru.neurotech.common.VisualizableDevice

deviceStateChanged

Constructor Summary

Constructor and Description

EcgDevice(long nativeObjPtr)

Methods Summary

Modifier and Type	Method and Description
void	close()
void	finalize()
java.lang.String	getAddress() Returns Bluetooth LE MAC address
int	getAverageHeartRateOnInterval Returns average heart rate based on NN-interval values from specified time interval
int	getBatteryLevel() Returns battery charge level in percents
int	getCurrentHeartRate() Calculates heart rate for recently received ECG samples Use this method to monitor heart rate during signal receiving is active It's not recommended to use this method to calculate heart rate while signal receiving is stopped, use getAverageHeartRateOnInterval instead
double	getCurrentHeartRateVariability() Returns currently detected value of heart rate variability Use this method to monitor HRV during signal receiving To get HRV for various intervals while signal receiving is stopped use getHeartRateVariabilityForInterval
double	getCurrentStressIndex() Returns value of stress index for real-time monitoring Use this method to monitor stress index while signal receiving is active To get stress index for various intervals while signal receiving is stopped use getStressIndexForInterval
double[]	getEcgSignal(double time, double duration) Returns ECG signal stored in buffer for selected time interval If interval exceeds maximum or minimum buffer time, signal samples for these intervals will be equal to zero
boolean	getElectrodesState() Returns flag indicating whether electrodes properly attached or not
double	getHeartRateVariabilityForInterval(double startTime, double endTime) Returns average value of heart rate variability on interval
java.lang.String	getName() Returns name of BLE device
NeuroDevice	getNeuroDevice() Returns physical device object which this visual device represents
RPeak[]	getRWavesOnInterval(double startTime, double endTime) Detects R-waves in signal for specified time interval
double	getStressIndexForInterval(double startTime, double endTime) Returns average value of stress index on interval
double	getTotalSignalDuration() Returns total signal duration in current test
void	reset() Clears signal buffer, sets duration to zero and resets all parameters to default values
void	startReceive()
void	stopReceive()

Field Detail

totalSignalDurationChanged

public final SubscribersNotifier<java.lang.Double> totalSignalDurationChanged

Notifies subscribers when signal duration is changed, when new samples received or data been loaded from external storage, or buffers been reset

electrodesAttachedStateChanged

public final SubscribersNotifier<java.lang.Boolean> electrodesAttachedStateChanged

Notifies when electrodes are attached or detached. To get electrodes state manually use getElectrodesState

Constructor Detail

EcgDevice

public EcgDevice(long nativeObjPtr)

Method Detail

finalize

public void finalize() throws java.lang.Throwable

Overrides:

finalize in class java.lang.Object

Throws:

java.lang.Throwable

close

public void close()

getName

public java.lang.String getName()

Description copied from class: VisualizableDevice

Returns name of BLE device

Specified by:

VisualizableDevice.getName() in class VisualizableDevice

Returns:

BLE device name

getAddress

public java.lang.String getAddress()

Description copied from class: VisualizableDevice

Returns Bluetooth LE MAC address

Specified by:

VisualizableDevice.getAddress() in class VisualizableDevice

Returns:

device unique address

getBatteryLevel

public int getBatteryLevel()

Description copied from class: VisualizableDevice

Returns battery state

Specified by:

VisualizableDevice.getBatteryLevel() in class VisualizableDevice

Returns:

battery charge level in percents

getNeuroDevice

public NeuroDevice getNeuroDevice()

Description copied from class: VisualizableDevice

Returns physical device object which this visual device represents

Specified by:

VisualizableDevice.getNeuroDevice() in class VisualizableDevice

Returns:

NeuroDevice of current visual device

startReceive

public void startReceive()

stopReceive

public void stopReceive()

reset

public void reset()

Clears signal buffer, sets duration to zero and resets all parameters to default values

getTotalSignalDuration

public double getTotalSignalDuration()

Returns total signal duration in current test.

Returns:

signal duration in seconds

getEcgSignal

public double[] getEcgSignal(double time, double duration)

Returns ECG signal stored in buffer for selected time interval. If interval exceeds maximum or minimum buffer time, signal samples for these intervals will be equal to zero.

Parameters:

time - Start time of interval in seconds

duration - Duration of interval in seconds

Returns:

Signal samples array

getRWavesOnInterval

public RPeak[] getRWavesOnInterval(double startTime, double endTime)

Detects R-waves in signal for specified time interval.

Parameters:

startTime - Start time of interval in seconds

endTime - End time of interval in seconds

Returns:

Array of RPeaks

getCurrentHeartRate

public int getCurrentHeartRate()

Calculates heart rate for recently received ECG samples. Use this method to monitor heart rate during signal receiving is active.

It's not recommended to use this method to calculate heart rate while signal receiving is stopped, use getAverageHeartRateOnInterval instead.

Returns:

Heart rate in beats per minute

getAverageHeartRateOnInterval

public int getAverageHeartRateOnInterval(double startTime, double endTime)

Returns average heart rate based on NN-interval values from specified time interval.

Parameters:

startTime - Start time in seconds for heart rate calculation

endTime - End time in seconds for heart rate calculation

Returns:

Heart rate in beats per minute

getCurrentHeartRateVariability

public double getCurrentHeartRateVariability() Returns currently detected value of heart rate variability. Use this method to monitor HRV during signal receiving.

To get HRV for various intervals while signal receiving is stopped use getHeartRateVariabilityForInterval

Returns:

HRV value

getHeartRateVariabilityForInterval

public double getHeartRateVariabilityForInterval(double startTime, double endTime)

Returns average value of heart rate variability on interval

Parameters:

startTime - Start time of calculation interval in seconds

endTime - End time of calculation interval in seconds

Returns:

HRV value

getCurrentStressIndex

public double getCurrentStressIndex()

Returns value of stress index for real-time monitoring. Use this method to monitor stress index while signal receiving is active.

To get stress index for various intervals while signal receiving is stopped use getStressIndexForInterval

Returns:

Stress index of current signal

getStressIndexForInterval

public double getStressIndexForInterval(double startTime, double endTime)

Returns average value of stress index on interval

Parameters:

startTime - Start time of calculation interval in seconds

endTime - End time of calculation interval in seconds

Returns:

Stress index value

getElectrodesState

public boolean getElectrodesState()

Returns flag indicating whether electrodes properly attached or not

Returns:

Is electrodes attached