Biosignal measurement system

A biosignal measurement system comprising:

• a first sensor device configured to be attached to one of a right side portion and a left side portion of a person to be measured;
• and
• a second sensor device configured to be attached to the other of the right side portion and the left side portion,
• wherein the first sensor device includes:
• a first electrode configured to detect a biopotential of the person to be measured;
• a first amplifier configured to amplify the biopotential detected by the first electrode;
• a first transmitter configured to modulate a carrier wave according to the biopotential amplified by the first amplifier and wirelessly transmit a first modulated signal to the second sensor device;
• a first piezoelectric element configured to receive an elastic wave transmitted from the second sensor device and convert the elastic wave into a second modulated signal;
• a first receiver configured to demodulate the second modulated signal to extract information on a biopotential;
• and
• a first reference potential generator configured to generate a reference potential of the first amplifier based on the biopotential amplified by the first amplifier and the biopotential extracted by the first receiver, and
• the second sensor device includes:
• a second electrode configured to detect a biopotential of the person to be measured;
• a second amplifier configured to amplify the biopotential detected by the second electrode;
• a second transmitter configured to modulate a carrier wave according to the biopotential amplified by the second amplifier;
• a second piezoelectric element configured to convert a second modulated signal output from the second transmitter into an elastic wave and transmit the elastic wave to the first sensor device;
• a second receiver configured to demodulate the first modulated signal transmitted from the first sensor device to extract information on the biopotential;
• and
• a second reference potential generator configured to generate a reference potential of the second amplifier based on the biopotential amplified by the second amplifier and the biopotential extracted by the second receiver.

A biosignal measurement system comprising:

• a first sensor device configured to be attached to one of a right side portion and a left side portion of a person to be measured;
• a second sensor device configured to be attached to the other of the right side portion and the left side portion,
• wherein the first sensor device includes:
• a first electrode configured to detect a biopotential of the person to be measured;
• a first amplifier configured to amplify the biopotential detected by the first electrode;
• a first transmitter configured to modulate a carrier wave according to the biopotential amplified by the first amplifier;
• a first piezoelectric element configured to convert a first modulated signal output from the first transmitter into an elastic wave and transmit the elastic wave to the second sensor device;
• a second piezoelectric element configured to receive the elastic wave transmitted from the second sensor device and convert the elastic wave into a second modulated signal;
• a first receiver configured to demodulate the second modulated signal to extract information on a biopotential;
• and
• a first reference potential generator configured to generate a reference potential of the first amplifier based on the biopotential amplified by the first amplifier and the biopotential extracted by the first receiver,
• the second sensor device includes:
• a second electrode configured to detect a biopotential of the person to be measured;
• a second amplifier configured to amplify the biopotential detected by the second electrode;
• a second transmitter configured to modulate a carrier wave according to the biopotential amplified by the second amplifier;
• a third piezoelectric element configured to convert a second modulated signal output from the second transmitter into an elastic wave and transmit the elastic wave to the first sensor device;
• a fourth piezoelectric element configured to receive the elastic wave transmitted from the first sensor device and convert the elastic wave into a first modulated signal;
• a second receiver configured to demodulate the first modulated signal output from the fourth piezoelectric element to extract information on a biopotential;
• and
• a second reference potential generator configured to generate a reference potential of the second amplifier based on the biopotential amplified by the second amplifier and the biopotential extracted by the second receiver, and
• a frequency of the first modulated signal is different from a frequency of the second modulated signal.

A biosignal measurement system comprising:

• a first wearable device configured to be attached to a first limb of a person;
• a second wearable device configured to be attached to a second limb of the person;
• wherein the first wearable device comprises:
• a first electrode configured to detect a first biopotential;
• a first amplifier configured to amplify the first biopotential;
• a first transmitter configured to wirelessly transmit first biopotential data;
• and
• a first elastic wave receiver configured to receive an elastic wave from the second wearable device;
• wherein the second wearable device comprises:
• a second electrode configured to detect a second biopotential;
• a second amplifier configured to amplify the second biopotential;
• a second transmitter configured to wirelessly transmit second biopotential data;
• and
• an elastic wave generator configured to transmit an elastic wave to the first wearable device;
• wherein the first and second wearable devices are configured to use a common reference potential for biopotential measurement based on exchanging biopotential information.