Communication system and communication method, and receiver

A communication method, comprising:

• generating, in a transmitter that includes a first transmitting electrode and a second transmitting electrode, a transmission signal between the first transmitting electrode and the second transmitting electrode;
• receiving, by a first receiving electrode the transmission signal via a first communication path that includes a human body;
• receiving, by a second receiving electrode, the transmission signal via a second communication path;
• generating, in a receiver that includes the first receiving electrode and the second receiving electrode, a reception signal between the first receiving electrode and the second receiving electrode;
• determining, by the receiver, a communication between the transmitter and the receiver is valid based on a determination that a polarity of the reception signal is a specific polarity, wherein the specific polarity corresponds to a polarity generated between the first transmitting electrode and the second transmitting electrode;
• and
• determining, by the receiver, the communication is invalid based on a determination that the polarity of the reception signal is different from the specific polarity, wherein the invalid communication is through one of
• a third communication path between the first transmitting electrode and the second receiving electrode, or
• a fourth communication path between the second transmitting electrode and the first receiving electrode.

A receiver, comprising:

• a first receiving electrode configured to receive a transmission signal via a first communication path that includes a human body;
• a second receiving electrode configured to receive the transmission signal via a second communication path, wherein
• generation of the transmission signal is between a first transmitting electrode of a transmitter and a second transmitting electrode of the transmitter, and
• the receiver is configured to generate a reception signal between the first receiving electrode and the second receiving electrode;
• and
• a determiner configured to:
• determine a communication between the receiver and the transmitter is valid based on a determination that a polarity of the reception signal is a specific polarity, wherein the specific polarity corresponds to a polarity generated between the first transmitting electrode and the second transmitting electrode;
• and
• determine the communication is invalid based on a determination that the polarity of the reception signal is different from the specific polarity, wherein the invalid communication is through one of
• a third communication path between the first transmitting electrode and the second receiving electrode, or
• a fourth communication path between the second transmitting electrode and the first receiving electrode.