摘要:
A communication apparatus and an active tag apparatus that conduct radio communication with for data transmission and reception by radio with each other are provided. A frequency designation data including local transmission frequency used for data transmission and specifying data on a frequency of a carrier sense to be carried by the active tag apparatus is provided. A controller commands the active tag apparatus to use the frequency designation data for radio communication.
摘要:
A communication apparatus and an active tag apparatus that conduct radio communication with for data transmission and reception by radio with each other are provided. A frequency designation data including local transmission frequency used for data transmission and specifying data on a frequency of a carrier sense to be carried by the active tag apparatus is provided. A controller commands the active tag apparatus to use the frequency designation data for radio communication.
摘要:
An information access system includes a reader/writer device and an information storage device. In the information storage device, a receiver unit senses a carrier of an RF signal at a first frequency for detection, in a first time period occurring at time intervals, and receives an information request signal in response to detection of a carrier of an RF signal at the first frequency, and senses a carrier of an RF signal at a second frequency in response to reception of the information request signal. In the storage device, a control causes the receiver unit to sense a carrier of an RF signal at the first frequency for detection, in a second time period after a sleep time period which is shorter than the time interval, in response to non-detection by the receiver unit of a carrier of an RF signal at the first frequency in the first time period.
摘要:
An active tag device includes a controller to cause the wireless communication unit to carry out data transmission at intervals of a first period, and to cause to start measurement of a second period set for determining a timing for causing a wireless communication unit to carry out carrier sense to detect data output by a reading writing apparatus, synchronously with the data transmission, and to cause the wireless communication unit to carry out the carrier sense after the second period elapsed. The reading writing apparatus includes a controller to cause to start measurement of the first period set for synchronizing with carrier sense of the active tag device after a wireless communication unit detected reception of data from the active tag device, and to cause the wireless communication unit to carry out data transmission to the active tag device during the second period after the first period elapsed.
摘要:
A wireless tag operable to communicate with a reader/writer, the wireless tag including a sensor that measures a physical quantity and converts the measured physical quantity into an electrical signal and determines whether a pattern formed by the electrical signal corresponds to a first pattern stored in advance in a storage unit and a communicating unit that starts communication with the reader/writer when the sensor determines that the pattern corresponds to the first pattern.
摘要:
A reader device of a location determination system gradually changes a transmission power step by step and repeatedly sends an interrogation signal which contains therein information on a power level indicating the transmission power. A tag of the location determination system receives the interrogation signal, sends a response signal into which the information on the power level contained in the interrogation signal is incorporated. The reader device receives the response signal and sends, to a management device, the information on the power level contained in the response signal and identification information for identifying the subject reader device. The management device detects the position of the tag based on the information on the power level and the identification information thus received.
摘要:
An information access system includes a reader/writer device and an information storage device. In the information storage device, a receiver unit senses a carrier of an RF signal at a first frequency for detection, in a first time period occurring at time intervals, and receives an information request signal in response to detection of a carrier of an RF signal at the first frequency, and senses a carrier of an RF signal at a second frequency in response to reception of the information request signal. In the storage device, a control causes the receiver unit to sense a carrier of an RF signal at the first frequency for detection, in a second time period after a sleep time period which is shorter than the time interval, in response to non-detection by the receiver unit of a carrier of an RF signal at the first frequency in the first time period.
摘要:
An information processing apparatus includes a user interface, a switching unit, and a computer. The user interface is for a user that operates a first processing unit that runs a first operating system or a second processing unit that runs a second operating system. The switching unit selectively switches between the first processing unit and the second processing unit to be associated with the user interface. The computer functions as the first processing unit. The computer functions as the second processing unit. The computer runs a first application program on the first operating system. The computer activates, on the second operating system, a second application program related to the first application program, in a state in which the first processing unit is associated with the user interface. The computer controls the switching unit upon completion of the activation of the second application program.
摘要:
An information processing apparatus includes: a physical quantity detector unit which transforms a physical quantity into an electric signal and provides a detected value represented by the electric signal; a physical quantity determiner unit which determines whether the detected value is larger than a given threshold value; a timer unit which measures a time period during which it continues to be determined that the detected value is not larger than the given threshold value, in response to the determination that the detected value is not larger than the given threshold value after it is determined that the detected value is larger than the given threshold; a transmitter unit which transmits a request signal for requesting transmission of data, when the time period measured by the timer unit transcends a first given time threshold; and a receiver unit which receives transmitted data which is transmitted in response to the request signal.
摘要:
An information access system comprises a reader/writer for continually transmitting an ID request signal at a first frequency and being continuously ready to receive an RF signal at a second frequency, and an active contactless information storage device having a receiver for sensing a carrier of an RF signal at the first frequency, and a transmitter for transmitting a response signal at the second frequency when the ID request signal is received. When the receiver senses a carrier of an RF signal at the first frequency in a particular predetermined period, the receiver receives further the ID request signal, and, in response to the ID request signal, the transmitter transmits a response signal at the second frequency carrying an ID of the storage device stored. In the carrier sensing, the controller causes the receiver to be in an active state and the transmitter to be in an inactive state in the predetermined periods. When the receiver attempts to sense a carrier of the RF signal at the first frequency in a particular predetermined period but detects no carrier, the controller controls the receiver and the transmitter to maintain the inactive state during a sleep period between the particular predetermined period and the subsequent predetermined period.