Abstract: The communication device can easily serve as an extended user interface such as a remote controller of a target apparatus without causing any complicated operations to a user. The communication device includes the following units. An apparatus information obtainment unit (203) obtains apparatus information from an apparatus. A position information obtainment unit (206) obtains position information of the communication device (102). An operation information obtainment unit (212) obtains operation information based on the apparatus information. A storage unit (213) stores the position information as apparatus position information indicating as a position of the apparatus, in association with the operation information. A direction sensor unit (207) detects direction of the communication device (102). A directional space calculation unit (208) calculates a directional space of the communication device (102).

Abstract: A mobile device includes a position sensing unit, a remote control information obtainment unit, and a storage unit. Position information obtained by the position sensing unit is stored in the storage unit in association with remote control information. The mobile device further includes a directional space obtainment unit and an apparatus specification unit. The mobile device recognizes a direction pointed by a user using the mobile device, and enables operation of a terminal apparatus existing in the pointing direction.

Abstract: The present invention provides a communication apparatus and a communication method that can easily indicate the position of the antenna incorporated in the communication apparatus to a user and can align the antenna of the communication apparatus with the antenna of an external device. A portable device (1) includes a loop antenna (11) for performing near-field communication, a display unit (12) provided on a side of the portable device (1) opposite the orientation of the loop antenna (11), and an antenna position information storing unit (142) that stores antenna position information representing the position of the loop antenna (11) in the portable device (1). The display device (12) displays the position of the loop antenna (11) on the basis of the antenna position information stored in the antenna position information storing unit (142).

Abstract: A repeater apparatus includes a network communication unit that acquires, from a server through a network, first terminal identification information for identifying a terminal to be controlled and control information for controlling the terminal to be controlled, a near-field communication unit that acquires, by near-field communication from the terminal, second terminal identification information for identifying the terminal and stored in the terminal, and a comparison unit that decides whether the first terminal identification information agrees with the second terminal identification information. The near-field communication unit transmits the control information to the terminal by near-field communication, in the case where the comparison unit decides that the first terminal identification information agrees with the second terminal identification information.

Abstract: A terminal apparatus that communicates with a mobile apparatus includes a near-field communication unit that receives time-of-day information from the mobile apparatus through near-field communication, a use history information generation unit that extracts operation information of the terminal apparatus, and generates use history information on the basis of the time-of-day information received by the near-field communication unit, the use history information including time-of-day information associated with the detected operation information and indicating the time of day at which the corresponding operation was performed, and a main memory that stores the generated use history information.

Abstract: A relay device (20) which performs Near Field Communication with a terminal device (10) which is a communication terminal device, and to process information received from the terminal device by a software; a loop antenna (201) which receives radio waves from the terminal device (10); an NFC unit (204) which performs Near Field Communication with the terminal device (10) via a loop antenna (201), and to receive from the terminal device (10) application identification information (1003) which identifies an application that processes the information received from the terminal device (10); and a controller (205) which acquires an application corresponding to the received application identification information (1003), and to cause the acquired application to run.

Abstract: The communication device can easily serve as an extended user interface such as a remote controller of a target apparatus without causing any complicated operations to a user. The communication device includes the following units. An apparatus information obtainment unit (203) obtains apparatus information from an apparatus. A position information obtainment unit (206) obtains position information of the communication device (102). An operation information obtainment unit (212) obtains operation information based on the apparatus information. A storage unit (213) stores the position information as apparatus position information indicating as a position of the apparatus, in association with the operation information. A direction sensor unit (207) detects direction of the communication device (102). A directional space calculation unit (208) calculates a directional space of the communication device (102).

Abstract: An optical transmission device is provided with an external optical modulator including three or more Mach-Zehnder interferometers and outputs a single-sideband optical intensity-modulated signal with suppressed optical carrier component, wherein an optical carrier component and an unnecessary one sideband component contained in the outputted optical signal are suppressed. A light branching section (51) branches an optical signal outputted by an external optical modulator (4) into two signals. A photodetector section (52) converts one of the optical signals to an electric signal. An optical carrier component extracting section (54) extracts an optical carrier component signal that is in the vicinity of a frequency f1 from the electric signal. An optical carrier component suppressing section (56) applies a bias voltage for suppressing the optical carrier component to the external optical modulator (4) based on the signal level of the optical carrier component.

Abstract: A data transmitting apparatus has improved security against eavesdropping for secret communication using Y-00 protocol. The multi-level code generation section generates, based on key information, a multi-level code sequence in which a signal level changes so as to be approximately random numbers. The multi-level processing section generates a multi-level signal having a level which corresponds to a combination between information data and the multi-level code sequence. The error signal generation section generates an error signal which changes randomly. The accumulation section accumulates the error signal, and outputs an accumulated error signal. The adding section adds the accumulated error signal to the multi-level signal, and outputs a variable multi-level signal. The modulator section modulates the variable multi-level signal, and outputs a modulated signal.

Abstract: A data communication apparatus which improves security against eavesdropping is provided for secret communication using Y-00 protocol. In a data transmitting apparatus 101, a multi-level code generation section 111 generates, based on key information 11, a multi-level code sequence 12 in which a signal level changes so as to be approximately random numbers. A multi-level processing section 112 generates a multi-level signal 13 having a plurality of levels each corresponding to a combination between information data 10 and the multi-level code sequence 12. A level conversion section 113 divides the plurality of levels of the multi-level signal 13 into several groups, and allocates one level of a converted multi-level signal 21 to a plurality of levels included in each of the several groups in an overlapped manner. The level conversion section 113 then converts the multi-level signal 13 into the converted multi-level signal 21.

Abstract: A data communication apparatus improves security against eavesdropping for secret communication by using Y-00 protocol. A multi-level code generation section generates, based on key information, a multi-level code sequence in which a signal level changes so as to be approximately random numbers. A level conversion section irreversibly converts the multi-level code sequence such that a converted multi-level code sequence does not constitute a mapping of the multi-level code sequence. A multi-level processing section generates a multi-level signal having a plurality of levels each corresponding to a combination between the information data and the multi-level code sequence. A modulator section modulates a multi-level signal in a predetermined modulation method and outputs a modulated signal.

Abstract: The present invention provides an optical transmission device 100 capable of solving the problem of an unnecessary residual sideband components to thereby obtain a high-quality optical intensity-modulated signal in a case where an SSB optical modulation section 20 has wavelength dependence and a manufacturing error. In the optical transmission device 100, where the SSB optical modulation section 20 cannot evenly branch the intensity of the optical carrier into two routes of optical waveguide, the amplitude adjusting section 62 adjusts the amplitude of an electric signal that changes the refractive index of the SSB optical modulation section 20 so that the unnecessary sideband component of the optical intensity-modulated signal outputted from the SSB optical modulation section 20 disappears.

Abstract: An optical SSB-SC modulation section 13 subjects an optical signal fa outputted from an optical source 11 to an optical SSB-SC modulation based on the amplitude of an external electric signal fc to thereby output an optical intensity-modulated signal. An optical phase modulation section 14 subjects the optical signal fa to an optical phase modulation based on the amplitude levels of the first to nth external electric signals having frequencies f1 to fn to thereby output the resultant signal as an optical phase-modulated signal. An optical combining section 15 combines together the optical intensity-modulated signal and the optical phase-modulated signal. An optical detecting section 16 performs an optical homodyne detection through a squared detection of the optical intensity-modulated signal and the optical phase-modulated signal combined together to thereby produce a wideband modulated signal, being the difference beat signal between the two optical signals.

Abstract: An object of this invention is to provide a modulator, an optical transmitter and an optical transfer device which can modulate a channel signal while suppressing residual AM signals regardless of the frequency of a channel signal and suppressing deterioration of the channel signal due to impossibility of giving a sufficient FM demodulation amplitude.

Abstract: An optical modulator comprises an electrode 21 which applies to an optical waveguides 12 of a Mach-Zehnder type optical interference system a first electric signal based on an alternating current signal S1 and a direct current bias V1, an electrode 22 which applies to an optical waveguide 13 of the Mach-Zehnder type optical interference system a second electric signal based on an alternating current signal S2 and a direct current bias V2, and a bias setting section 41 which sets average direct current levels of the first and second electric signals based on signal frequency information D1 which indicates a magnitude relation between a maximum frequency of the alternating current signal S1 and a maximum frequency of the alternating current signal S2.

Abstract: An angle modulator having an excellent noise characteristic and an excellent distortion characteristic independent of an unwanted wave component of an optical modulation signal is provided. The angle modulator (10) includes an optical SSB modulation section (103a), an optical SSB-SC modulation section (104a), and an optical angle modulation section (105). By performing intensity modulation on an output signal of the optical SSB modulation section (103a) at the optical SSB-SC modulation section (104a), an unwanted angle modulated signal is prevented from overlapping with an angle modulated signal outputted from an optical detection section (107). Further, by a filter (108) filtering only an angle modulated signal component which does not include the unwanted wave component among the angle modulated signal components outputted from the optical detection section (107), a distortion characteristic after angle demodulation can be prevented from deteriorating.

Abstract: A data communication apparatus which improves security against eavesdropping is provided for secret communication using Y-00 protocol. In a data transmitting apparatus 101, a multi-level code generation section 111 generates, based on key information 11, a multi-level code sequence 12 in which a signal level changes so as to be approximately random numbers. A multi-level processing section 112 generates a multi-level signal 13 having a plurality of levels each corresponding to a combination between information data 10 and the multi-level code sequence 12. A level conversion section 113 divides the plurality of levels of the multi-level signal 13 into several groups, and allocates one level of a converted multi-level signal 21 to a plurality of levels included in each of the several groups in an overlapped manner. The level conversion section 113 then converts the multi-level signal 13 into the converted multi-level signal 21.

Abstract: An optical modulator comprises an electrode 21 which applies to an optical waveguides 12 of a Mach-Zehnder type optical interference system a first electric signal based on an alternating current signal S1 and a direct current bias V1, an electrode 22 which applies to an optical waveguide 13 of the Mach-Zehnder type optical interference system a second electric signal based on an alternating current signal S2 and a direct current bias V2, and a bias setting section 41 which sets average direct current levels of the first and second electric signals based on signal frequency information D1 which indicates a magnitude relation between a maximum frequency of the alternating current signal S1 and a maximum frequency of the alternating current signal S2.

Abstract: An optical transmission device is provided with an external optical modulator including three or more Mach-Zehnder interferometers and outputs a single-sideband optical intensity-modulated signal with suppressed optical carrier component, wherein an optical carrier component and an unnecessary one sideband component contained in the outputted optical signal are suppressed. A light branching section (51) branches an optical signal outputted by an external optical modulator (4) into two signals. A photodetector section (52) converts one of the optical signals to an electric signal. An optical carrier component extracting section (54) extracts an optical carrier component signal that is in the vicinity of a frequency f1 from the electric signal. An optical carrier component suppressing section (56) applies a bias voltage for suppressing the optical carrier component to the external optical modulator (4) based on the signal level of the optical carrier component.