Patent ID: 8422596
Filing Date: 2013-04-16
Classification: H04B

Abstract:
1. A communication device comprising: demodulating means for demodulating a transmission signal from another communication device that performs noncontact communication; calculating means for performing at least one of addition and subtraction of a predetermined voltage according to a logical value of a demodulated signal obtained by demodulation by the demodulating means; determining means for determining a communication system of the transmission signal transmitted by the other communication device by comparing a calculation result of the calculating means at predetermined timing after a lapse of a predetermined time from the start of communication with a threshold voltage; and transmitting means for transmitting predetermined data to the other communication device in the communication system determined by the determining means among plural communication systems that the device itself can support, wherein the calculating means performs addition or subtraction of the predetermined voltage according to the logical value of the demodulated signal in a period from the start of communication to the predetermined timing, and wherein the calculation result of the calculating means is a value obtained by converting a ratio of a length of a period of a predetermined logical value of the demodulated signal in the period from the start of communication to the predetermined timing into a voltage value.