Communication device, communication system, and communication method

Patent metadata

Field	Value
Publication number	US-2016119035-A1
Application number	US-201414892813-A
Country	US
Kind code	A1
Filing date	May 19, 2014
Priority date	May 28, 2013
Publication date	Apr 28, 2016
Grant date	—

Abstract

There may be included: a demodulation section configured to perform, based on a modulated signal transmitted from an associated communication device, amplitude change demodulation and phase change demodulation, and configured to select a demodulated signal demodulated with either one of the amplitude change demodulation and the phase change demodulation; and a modulation section configured to modulate magnetic field generated by the associated communication device.

First claim

1 . A communication device, comprising:
a demodulation section configured to perform, based on a modulated signal transmitted from an associated communication device, amplitude change demodulation and phase change demodulation, and configured to select a demodulated signal demodulated with either one of the amplitude change demodulation and the phase change demodulation; and a modulation section configured to modulate magnetic field generated by the associated communication device.

2 . The communication device according to claim 1 ,
wherein the modulated signal includes a data portion and a header portion preceding the data portion, and the demodulation section selects one of a first demodulated signal and a second demodulated signal based on a portion corresponding to the header portion in the first demodulated signal and the second demodulated signal, the first demodulated signal being demodulated with the amplitude change demodulation, and the second demodulated signal being demodulated with the phase change demodulation.

3 . The communication device according to claim 2 ,
wherein the demodulation section selects, out of the first demodulated signal and the second demodulated signal, the demodulated signal whose header portion is detected earlier, and outputs the selected demodulated signal.

4 . The communication device according to claim 2 ,
wherein the communication device is configured to perform communication with the associated communication device via near field communication.

5 . The communication device according to claim 4 ,
wherein the near field communication is standardized in accordance with ISO/IEC 18092, and the header portion is a preamble.

6 . The communication device according to claim 4 ,
wherein the near field communication is standardized in accordance with ISO/IEC 14443-2, and the header portion is a start of frame.

7 . The communication device according to claim 1 ,
wherein the modulated signal is an ASK modulated signal.

8 . The communication device according to claim 1 ,
wherein the modulation section includes: a coil; a resistor; and a switch configured to turn on and off connection between both ends of the coil through the resistor.

9 . The communication device according to claim 1 ,
wherein the communication device is an IC card.

10 . The communication device according to claim 1 ,
wherein the communication device is a mobile information terminal.

11 . A communication system, comprising:
a first communication device; and a second communication device, wherein the first communication device includes a demodulation section configured to perform, based on a modulated signal transmitted from the second communication device, amplitude change demodulation and phase change demodulation, and configured to select a demodulated signal demodulated with either one of the amplitude change demodulation and the phase change demodulation, and a modulation section configured to modulate magnetic field generated by the second communication device.

12 . A communication method, comprising:
receiving a signal by performing, based on a modulated signal transmitted from an associated communication device, amplitude change demodulation and phase change demodulation, and by selecting a demodulated signal demodulated with either one of the amplitude change demodulation and the phase change demodulation; and transmitting a signal by modulating magnetic field generated by the associated communication device.

Assignees

• Sony Corp

Inventors

• Iida Yasuhiro
• Takanohashi Kazukuni
• Kobayashi Kenichi
• Oguchi Kazuhiro

Classifications

• H04W4/80

  Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication · CPC title

• G06K7/10009

  sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves · CPC title

• H04L27/02

  Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation (H04L27/32 takes precedence) · CPC title

• H04B5/266

  One coil at each side, e.g. with primary and secondary coils · CPC title

• H04W4/008

  Electricity · mapped topic