Abstract: An electronic document display control system includes an obtaining unit that, when a restricted electronic document, which is available only to authorized persons when displayed, is displayed on a display device, obtains unauthorized person presence information, which indicates that an unauthorized person might view the restricted electronic document and a display control unit that, when the obtaining unit obtains the unauthorized person presence information, prevents the restricted electronic document from being displayed.

Abstract: Provided is an electronic pen including a rod-like member that includes a pen tip at a front and is supported movably in a longitudinal direction, an electronic component, at least a portion of which is provided on a rear side of the rod-like member opposite to a side on which the pen tip is included, a casing that has a tubular shape and stores the rod-like member and the electronic component, and a transmission member that is provided in a space interposed between the electronic component and an inner circumferential surface of the casing and transmits an externally received force at a rear of the rod-like member to move the rod-like member in the longitudinal direction.

Abstract: A data input system including electronic paper and a stylus writing device is disclosed. The electronic paper includes a transparent display substrate on which a number of optically readable code patterns have been formed, the optically readable code patterns representing positional information on a display surface, a rear surface substrate opposing the display substrate, and coloring particles that are enclosed between the display substrate and the rear surface substrate and that are movable by applying an electric or a magnetic field. The electronic paper displays an image due to motion of the particle. The stylus writing device includes a writing head provided at the end of the stylus for writing the image by applying an electric or a magnetic field to the electronic paper by contact and includes an optical reading device for optically reading the code patterns formed on the display surface where the end of the stylus contacts.

Abstract: A transmitting/receiving system includes two transmitting/receiving apparatuses connected through a transmission cable having two one-direction signal lines. Each apparatus includes a transmitting unit that transmits a signal, a receiving unit that receives a signal, a calculator, a controller, a storage, and an estimating unit. The calculator calculates an Signal to Noise (S/N) ratio of the received signal. The controller controls the calculation by obtaining, as a first value, a strength of a signal caused by a check signal transmitted during absence of a check signal being received, obtaining, as a second value, a strength of a check signal received during absence of a check signal being transmitted, and dividing the second value by the first value. The storage stores relationship between a predetermined transmission-cable S/N ratio and temporal signal fluctuation. The estimating unit estimates temporal signal fluctuation from the calculated S/N ratio and the relationship.

Abstract: A transmitting/receiving device includes a transmitting/receiving unit and a signal processing unit. The transmitting/receiving unit is connected to a transmission side or a reception side via a differential signal line including a pair of signal lines, receives a signal using one of the pair of signal lines when being connected to the transmission side, and transmits a signal using the other of the pair of signal lines when being connected to the reception side. The signal processing unit processes a signal that is transmitted or received by the transmitting/receiving unit.

Abstract: A communication device includes: a reception unit that receives a signal transmitted from another communication device via a transmission path; a transmission unit that transmits a signal to the another communication device via the transmission path; an error rate measurement unit that measures an error rate representing a probability of occurrence of errors in a signal received by the reception unit in a case where a bi-directional communication with the another communication device is performed; and a phase adjustment unit that adjusts a phase of a signal transmitted from the transmission unit to the another communication device based on an error rate measured by the error rate measurement unit.

Abstract: A transmitting/receiving system includes two transmitting/receiving apparatuses connected through a transmission cable having two one-direction signal lines. Each apparatus includes a transmitting unit that transmits a signal, a receiving unit that receives a signal, a calculator, a controller, a storage, and an estimating unit. The calculator calculates an S/N ratio of the received signal. The controller controls the calculation by obtaining, as a first value, a strength of a signal caused by a check signal transmitted during absence of a check signal being received, obtaining, as a second value, a strength of a check signal received during absence of a check signal being transmitted, and dividing the second value by the first value. The storage stores relationship between a predetermined transmission-cable S/N ratio and temporal signal fluctuation. The estimating unit estimates temporal signal fluctuation from the calculated S/N ratio and the relationship.

Abstract: A signal processing system that includes a transmitter component, a receiver component, a comparison component and an execution component is provided. The transmitter component transmits a predetermined detection signal, using one or other of a plurality of signal lines of a transmission path. The receiver component receives an interference signal, occurring in a different signal line from the signal line the transmitter component used for transmitting the detection signal, the interference signal occurring from interference due to the detection signal transmitted from the transmitter component. The comparison component compares a voltage value of the interference signal received by the receiver component with a predetermined reference voltage value. The execution component, based on a comparison result of comparison by the comparison component, executes predetermined processing according to the comparison result.

Abstract: The present invention provides a communication system including: a transmitter section that transmits a signal having a predetermined waveform; plural receiver sections that receive the signal via signal transmission paths; a physical quantity measuring section that measures a physical quantity of the signal transmission paths, based on the transmission time of the signal from the transmitter section to the receiver section; a correction section that corrects a signal received via the signal transmission paths, and corrects a signal transmitted from the transmitter section and outputs the signal to the signal transmission path; and a setting section that sets, in the correction section, a correction amount in accordance with the physical quantity for correcting a signal received via the signal transmission path, and/or a correction amount in accordance with the physical quantity for correcting a signal transmitted from the transmitter section and outputting to the signal transmission path.

Abstract: A transmitting/receiving device includes a transmitting/receiving unit and a signal processing unit. The transmitting/receiving unit is connected to a transmission side or a reception side via a differential signal line including a pair of signal lines, receives a signal using one of the pair of signal lines when being connected to the transmission side, and transmits a signal using the other of the pair of signal lines when being connected to the reception side. The signal processing unit processes a signal that is transmitted or received by the transmitting/receiving unit.

Abstract: A communication device includes: a reception unit that receives a signal transmitted from another communication device via a transmission path; a transmission unit that transmits a signal to the another communication device via the transmission path; an error rate measurement unit that measures an error rate representing a probability of occurrence of errors in a signal received by the reception unit in a case where a bi-directional communication with the another communication device is performed; and a phase adjustment unit that adjusts a phase of a signal transmitted from the transmission unit to the another communication device based on an error rate measured by the error rate measurement unit.

Abstract: A signal processing system that includes a transmitter component, a receiver component, a comparison component and an execution component is provided. The transmitter component transmits a predetermined detection signal, using one or other of a plurality of signal lines of a transmission path. The receiver component receives an interference signal, occurring in a different signal line from the signal line the transmitter component used for transmitting the detection signal, the interference signal occurring from interference due to the detection signal transmitted from the transmitter component. The comparison component compares a voltage value of the interference signal received by the receiver component with a predetermined reference voltage value. The execution component, based on a comparison result of comparison by the comparison component, executes predetermined processing according to the comparison result.

Abstract: A responder authenticity determination system, comprising: a responder that sends a response signal in response to a received signal; an interrogation signal generator that generates an interrogation signal having a random waveform; a transceiver that sends the generated interrogation signal to the responder, and receives a response signal from the responder; and an authenticity determination unit that determines authenticity of the responder based on the received response signal and the random waveform of the generated interrogation signal.

Abstract: The present invention provides a communication system including: a transmitter section that transmits a signal having a predetermined waveform; plural receiver sections that receive the signal via signal transmission paths; a physical quantity measuring section that measures a physical quantity of the signal transmission paths, based on the transmission time of the signal from the transmitter section to the receiver section; a correction section that corrects a signal received via the signal transmission paths, and corrects a signal transmitted from the transmitter section and outputs the signal to the signal transmission path; and a setting section that sets, in the correction section, a correction amount in accordance with the physical quantity for correcting a signal received via the signal transmission path, and/or a correction amount in accordance with the physical quantity for correcting a signal transmitted from the transmitter section and outputting to the signal transmission path.

Abstract: A non-contact signal transmission apparatus transmits electric power and a signal in a non-contact manner via magnetic induction. The apparatus includes: a pair of annular electric power cores provided in opposing relationship to each other; a pair of electric power coils respectively provided in an annular form at one of the pair of electric power cores; and a pair of signal coils respectively provided in an annular form inside one of the pair of electric power cores. Relative permeability inside and around the signal coils is lower than relative permeability of the electric power cores.

Abstract: A sensor of this comprises a receiving section that receives a signal that is sent from outside, a circuit whose impedance changes irreversibly in accordance with an environmental change, a measurement section that measures the impedance of the circuit in an event that a signal is received by the receiving section, and a sending section that sends data representing a measurement result of the measurement section.

Abstract: A sensor includes a substrate, a medium on which a surface acoustic wave propagates, a reference electrode, an antenna, a transducer that includes a first electrode connected to the antenna and a second electrode connected to the reference electrode and arranged opposite to the first electrode, and that has a function of converting a signal received by the antenna into a surface acoustic wave propagating on the medium, and a function of converting a surface acoustic wave propagating on the medium and reaching the transducer into a signal and outputting the signal to the antenna, a reflector that throws back a surface acoustic wave generated by the transducer, propagating on the medium, and reaching the reflector, toward the transducer, and an impedance converter connected to the reference electrode, impedance of which changes in response to a change in circumstances surrounding the sensor.

Abstract: A data input system including electronic paper and a stylus writing device is disclosed. The electronic paper includes a transparent display substrate on which a number of optically readable code patterns have been formed, the optically readable code patterns representing positional information on a display surface, a rear surface substrate opposing the display substrate, and coloring particles that are enclosed between the display substrate and the rear surface substrate and that are movable by applying an electric or a magnetic field. The electronic paper displays an image due to motion of the particle. The stylus writing device includes a writing head provided at the end of the stylus for writing the image by applying an electric or a magnetic field to the electronic paper by contact and includes an optical reading device for optically reading the code patterns formed on the display surface where the end of the stylus contacts.

Abstract: A wireless terminal holder includes a body that attachably accommodates a wireless terminal that exchanges radio waves via an antenna, an antenna unit attached to the body and that is of sufficient strength to freely support the body, and that functions as the antenna for the wireless terminal when connected to an antenna terminal of the wireless terminal, and a connector attached to the body that connects the antenna unit to the antenna terminal of the wireless terminal, with the wireless terminal being accommodated in the body.

Abstract: A non-contact signal transmission apparatus transmits electric power and a signal in a non-contact manner via magnetic induction. The apparatus includes: a pair of annular electric power cores provided in opposing relationship to each other; a pair of electric power coils respectively provided in an annular form at one of the pair of electric power cores; and a pair of signal coils respectively provided in an annular form inside one of the pair of electric power cores. Relative permeability inside and around the signal coils is lower than relative permeability of the electric power cores.