Felica Networks, Inc.

Katsuhiro Onozuka

Norihiro Ichimaru

Shogo Kawata

Kiyotada Yokogi

Masayuki Umejima

There is provided a communication apparatus including a voltage detection unit for detecting an antenna end voltage of a reader or a non-contact type IC card when non-contact communicating using a load modulation of the non-contact type IC card with respect to a magnetic field signal from the reader/writer; and a characteristics control unit for changing characteristics of the antenna of the reader/writer or the non-contact type IC card when the antenna end voltage detected by the voltage detection unit reaches a predetermined first threshold value.

Communication apparatus and method of controlling antenna characteristics

An arithmetic circuit includes: a detection unit that detects a code error for plural signals respectively modulated by different modulation methods and encoded by a predetermined encoding method; a measurement unit that measures a number of times of signal variations at a predetermined frequency or less generated in the plural signals in a period from detection of the code error in the detection unit to first detection of predetermined data contained in the plural signals with respect to each of the plural signals; and a selection unit that selects one signal from the plural signals based on a measurement result of the measurement unit.

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Tokyo, Japan

Katsuhiro Onozuka