Communication device, communication method, and program

A communication method using a communication device that performs noncontact communication with another communication device, the method comprising the step of determining a communication system of a transmission signal transmitted by the other communication device based on a periodical change of a binarized signal obtained by demodulation of the transmission signal transmitted from the other communication device,

• wherein after detecting a first edge, a determining means is configured to detect a plurality of signal levels of the binarized signal within a first period of at most 64/(carrier wave frequency) to determine the communication system, wherein the determining means determines the communication system according to a detection result when signal levels of the binarized signal are detected with a second period at a predetermined number of times, and wherein the first period is a half of 1 etu (elementary time unit), which is the shortest among the communication systems to be determined, or less.

A non-transitory computer readable medium storing a computer program which, when executed, causes a computer to function as determining means for determining a communication system of a transmission signal transmitted by another communication device that performs noncontact communication based on a periodical change of a binarized signal obtained by demodulation of the transmission signal transmitted from the other communication device,

• wherein after detecting a first edge, a determining means is configured to detect a plurality of signal levels of the binarized signal within a first period of at most 64/(carrier wave frequency) to determine the communication system, wherein the determining means determines the communication system according to a detection result when signal levels of the binarized signal are detected with a second period at a predetermined number of times, and wherein the first period is a half of 1 etu (elementary time unit), which is the shortest among the communication systems to be determined, or less.

A communication device comprising a determining unit configured to determine a communication system of a transmission signal transmitted by another communication device that performs noncontact communication based on a periodical change of a binarized signal obtained by demodulation of the transmission signal transmitted from the other communication device,

• wherein after detecting a first edge, the determining unit is configured to detect a plurality of signal levels of the binarized signal within a first period of at most 64/(carrier wave frequency) to determine the communication system, wherein the determining unit determines the communication system according to a detection result when signal levels of the binarized signal are detected with a second period at a predetermined number of times, and wherein the first period is a half of 1 etu (elementary time unit), which is the shortest among the communication systems to be determined, or less.

A non-transitory computer readable medium storing a computer program which, when executed, causes a computer to determine a communication system of a transmission signal transmitted by another communication device that performs noncontact communication based on a periodical change of a binarized signal obtained by demodulation of the transmission signal transmitted from the other communication device,

• wherein after detecting a first edge, a determining unit is configured to detect a plurality of signal levels of the binarized signal within a first period of at most 64/(carrier wave frequency) to determine the communication system, wherein the determining unit determines the communication system according to a detection result when signal levels of the binarized signal are detected with a second period at a predetermined number of times, and wherein the first period is a half of 1 etu (elementary time unit), which is the shortest among the communication systems to be determined, or less.

A communication device comprising determining means for determining a communication system of a transmission signal transmitted by another communication device that performs noncontact communication based on a periodical change of a binarized signal obtained by demodulation of the transmission signal transmitted from the other communication device,

• wherein after detecting a first edge, the determining means is configured to detect a plurality of signal levels of the binarized signal within a first period of at most 64/carrier wave frequency) to determine the communication system, wherein the determining means determines the communication system based on five signal levels detected within the first period.

A communication device comprising determining means for determining a communication system of a transmission signal transmitted by another communication device that performs noncontact communication based on a periodical change of a binarized signal obtained by demodulation of the transmission signal transmitted from the other communication device,

• wherein after detecting a first edge, the determining means is configured to detect a plurality of signal levels of the binarized signal within a first period of at most 64/(carrier wave frequency) to determine the communication system, wherein the determining means determines the communication system based on four signal levels detected within the first period.