Cardiac potential detection device and cardiac potential detection method

1. A cardiac potential detection device for detecting R-waves from an electrocardiographic waveform, the cardiac potential detection device comprising:

a plurality of electrodes;

a detector configured to detect an input voltage applied from the plurality of electrodes; and

a control unit configured to:

identify an R-wave candidate based on an R-wave detection threshold and a peak in the input voltage,

determine whether an absolute value of the input voltage is smaller than a predetermined threshold;

when the control unit determines that the absolute value of the input voltage has exceeded the predetermined threshold, calculate a detection-suspension period based on a time at which the input voltage exceeded the predetermined threshold, and suspend identifying of an R-wave candidate in the detection-suspension period, and

in a period excluding the detection-suspension period, identify the R-wave candidate as an R-wave when the input voltage does not exceed the predetermined threshold in a period from the R-wave candidate peak until a predetermined time expires.

2. The cardiac potential detection device according to claim 1 , wherein the detection-suspension period includes a predetermined period occurring before the time at which the input voltage exceeded the predetermined threshold and a predetermined period after a time at which the input voltage has become and remains less than the predetermined threshold.

3. The cardiac potential detection device according to claim 1 , wherein the control unit adaptively sets the R-wave detection threshold based on the input voltage in a period excluding the detection-suspension period, and keeps the R-wave detection threshold unchanged in the detection-suspension period.

4. The cardiac potential detection device according to claim 1 , wherein the predetermined threshold is determined based on an input range of the detector.

5. The cardiac potential detection device according to claim 1 , wherein the detection-suspension period includes a period of 500 ms occurring before and after the period in which the input voltage exceeds the predetermined threshold.

6. The cardiac potential detection device according to claim 1 , wherein the plurality of electrodes are attached to an attachment to be worn by a human body.

7. The cardiac potential detection device according to claim 1 , wherein the plurality of electrodes are attached to a gripping member.

8. A cardiac potential detection method for detecting R-waves from an electrocardiographic waveform, the cardiac potential detection method comprising:

detecting an input voltage applied from a plurality of electrodes;

identifying an R-wave candidate based on an R-wave detection threshold and a peak in the input voltage,

determining whether an absolute value of the input voltage is smaller than a predetermined threshold;

when the absolute value of the input voltage has exceeded the predetermined threshold, calculating a detection-suspension period based on a time at which the input voltage exceeded the predetermined threshold, and suspending identifying of an R-wave candidate in the detection-suspension period, and

in a period excluding the detection-suspension period, identifying the R-wave candidate as an R-wave when the input voltage does not exceed the predetermined threshold in a period from the R-wave candidate peak until a predetermined time expires.

9. The cardiac potential detection device according to claim 1 , wherein the peak is a peak of the absolute value of a differential value of the input voltage.