Abstract: A radio wave map provision device includes a radio wave map storage that stores a radio wave map. The radio wave map includes reference position information indicating a reference position, a communication speed with each external communication device at the reference position, and a connection probability indicating a probability of performing wireless communication with each external communication device at the reference position. The radio wave map provision device: receives the radio wave map request including request position information indicating a request position; obtains a lowest guaranteed speed and an estimated speed, at the reference position, based on the communication speed and the connection probability; and transmits a radio wave map reply including the connection probability, the lowest guaranteed speed, and the estimated speed, at the reference position corresponding to the request position information.

Abstract: A radio wave map generator device includes a receiving unit, a communication speed calculation unit, a connection probability calculation unit, and a storage unit. The receiving unit is configured to receive pieces of probe information each of which contains location information, propagation environment information, and external communication device identification information. The communication speed calculation unit is configured to calculate a first communication speed, and a second communication speed. The connection probability calculation unit is configured to calculate a first connection probability, and a second connection probability. The storage unit is configured to store the location information, external communication device identification information, the first communication speed, the second communication speed, the first connection probability, and the second connection probability.

Abstract: A data transmission device includes a wireless communication unit that wirelessly communicates with an external communication device, a travel route information acquirer that acquires a future travel route of a moving object, a travel route, a propagation environment information acquirer that acquires propagation environment information of a radio wave propagation path used in wireless communication, a speed information acquisition unit that acquires the moving speed of a moving object, and a converter that converts a relationship between the travel route and propagation environment information into a plurality of data slots each defined by the communication speed per unit time; a transmission instructor that instructs the wireless communication unit to transmit the data allocated to the data slot.

Abstract: A positioning system includes: multiple positioning devices: and a center device that communicates with each of the multiple positioning devices. At least one positioning device is usable at a moving body, and includes: a positioning calculator that calculates a location dependence delay amount and a propagation distance and calculates a current position of the at least one positioning device; and a positioning communication portion that transmits the location dependence delay amount. The center device includes: an update portion that updates a distribution location dependence delay amount; and a distribution communication portion that transmits the distribution location dependence delay amount to at least one of the multiple positioning devices.

Abstract: In a wireless communication apparatus, data transmitted from at least one wireless transmitter is received by direct wireless communication, and its wireless reception condition is detected. Relation reference information setting two or more relations between the wireless reception condition on a reception of transmitted data and location information of the transmitter is stored. Relative distance information of a relative distance between the transmitter and the apparatus is measured. Relation information indicating a relation between the wireless reception conditions and the relative distance information is generated. A relation between the location information and the relative distance information is determined by comparing the relation reference information and the relation information. A current location of the apparatus is determined on the basis of the relation between the location information and the relative distance information and a current wireless reception condition.

Abstract: In a wireless communication apparatus, data transmitted from at least one wireless transmitter is received by direct wireless communication, and its wireless reception condition is detected. Relation reference information setting two or more relations between the wireless reception condition on a reception of transmitted data and location information of the transmitter is stored. Relative distance information of a relative distance between the transmitter and the apparatus is measured. Relation information indicating a relation between the wireless reception conditions and the relative distance information is generated. A relation between the location information and the relative distance information is determined by comparing the relation reference information and the relation information. A current location of the apparatus is determined on the basis of the relation between the location information and the relative distance information and a current wireless reception condition.

Abstract: A timing adjustment device includes a plurality of receive circuits that receive an input signal based on mutually different timings, a determination circuit that determines a first transition and a second transition of the input signal based on a received result by receive circuits, among the plurality of receive circuits, that receive the input signal with adjacent timings among different timings of the plurality of receive circuits, and an adjustment circuit that adjusts the receiving timing of the input signal so that the receiving timing of the input signal becomes close to a central timing of a period according to the first transition and the second transition.

Abstract: A timing adjustment device includes a plurality of receive circuits that receive an input signal based on mutually different timings, a determination circuit that determines a first transition and a second transition of the input signal based on a received result by receive circuits, among the plurality of receive circuits, that receive the input signal with adjacent timings among different timings of the plurality of receive circuits, and an adjustment circuit that adjusts the receiving timing of the input signal so that the receiving timing of the input signal becomes close to a central timing of a period according to the first transition and the second transition.

Abstract: There are provided a highly sensitive force/mass detection method and device using a phase-locked loop, in which a phase noise of the mechanical element can be reduced using the phase-locked loop, by synchronizing a vibration signal of a mechanical element to an oscillation signal from a local oscillator which has a low phase noise and a high purity property. In the highly sensitive force/mass detection device using the phase-locked loop, an oscillation circuit of a mechanical vibrator 1 including a phase adjuster 10, a binarization circuit 5 for detecting a phase of an oscillation signal of the oscillation circuit, a local oscillator 7 having a low phase noise and a high purity property, a phase comparator 6 for comparing the phase of the oscillation signal of the mechanical vibrator 1 with a phase of an oscillation signal from the local oscillator 7, and a loop filter 8 connected to the phase comparator 7, are provided.

Abstract: A musical tune playback apparatus is basically constituted by a controller (CPU), a digital media drive (e.g., a CD drive), a hard disk drive, and a sound system. Musical tune data recorded on a digital storage media (e.g., CD) are played back and are transferred to the hard disk drive together with relative information and/or image data. When a user inputs retrieval conditions, the controller retrieves musical tune data related to relative information (or image), which substantially matches retrieval conditions. Specifically, a relative information retrieval database is stored in a data area of the hard disk drive, wherein an auto-input area automatically describes an index ID, TOC information, and history information while a manual-input area describes other data and information with regard to each musical tune that is played back. Thus, desired musical tune data are automatically retrieved from the hard disk drive with reference to the database.

Abstract: In a communication system, a content server reads required data from a content database and transmits the data by packet communications over public communication lines, and a network management server receives and stores the required information from the public communication lines. The network management server sends the temporarily stored data to plural transmitter stations. Each transmitter station has a corresponding dividing device. Each dividing device receives and relays to the linked transmitter station only the amount of data required for transmission to the linked transmitter station. The remaining data is simply passed by the dividing device to the next dividing device without processing the data in any way.

Abstract: A wireless base station and a wireless mobile station repeat, via a wireless communication section therebetween, transmission of contents data from a server to a terminal. Each of the wireless base station and the wireless mobile station periodically transmits camouflage data to each of the server and the terminal, respectively, when the wireless communication section is incommunicative. This causes each of the server and the terminal to determine that a connection for data communication between the server and the terminal is continuing. Processing for the transmission/reception in the data communication is thereby prevented from being interrupted even when a wireless communication environment deteriorates and the wireless communication section becomes incommunicative.

Abstract: A packet signal, formed according to an orthogonal frequency division multiplexing (OFDM) format, received by a receiver is decoded in a decoder device of the receiver. The packet signal includes a data code and a control code having a formula for decoding the data code. The control code is first decoded and analyzed to obtain the decoding formula contained therein. The data code is decoded during a period in which the control code is being analyzed, based on plural decoding formulae one of which coincides with the decoding formula contained in the control code. Data signals decoded based on the respective decoding formulae are sent to an output selector together with the decoding formula obtained from the control code. The output selector selects a data signal which is decoded based on a decoding formula that coincides with the decoding formula obtained from the control code.

Abstract: In a radio communication system, a base station sends each of n send packets to a terminal station in parallel through n channels as they are in packet unit instead of dividing each of n send packets to send the same to the terminal station. It is possible in the base station to eliminate the need for a processing of dividing send packets and processing of resending divided send packets. It is also possible in the terminal station to eliminate the need of a configuration for receiving the divided send packets.

Abstract: A musical tune playback apparatus is basically constituted by a controller (CPU), a digital media drive (e.g., a CD drive), a hard disk drive, and a sound system. Musical tune data recorded on a digital storage media (e.g., CD) are played back and are transferred to the hard disk drive together with relative information and/or image data. When a user inputs retrieval conditions, the controller retrieves musical tune data related to relative information (or image), which substantially matches retrieval conditions. Specifically, a relative information retrieval database is stored in a data area of the hard disk drive, wherein an auto-input area automatically describes an index ID, TOC information, and history information while a manual-input area describes other data and information with regard to each musical tune that is played back. Thus, desired musical tune data are automatically retrieved from the hard disk drive with reference to the database.

Abstract: In a communication system, a content server reads required data from a content database and transmits the data by packet communications over public communication lines, and a network management server receives and stores the required information from the public communication lines. The network management server sends the temporarily stored data to plural transmitter stations. Each transmitter station has a corresponding dividing device. Each dividing device receives and relays to the linked transmitter station only the amount of data required for transmission to the linked transmitter station. The remaining data is simply passed by the dividing device to the next dividing device without processing the data in any way.

Abstract: A packet signal, formed according to an orthogonal frequency division multiplexing (OFDM) format, received by a receiver is decoded in a decoder device of the receiver. The packet signal includes a data code and a control code having a formula for decoding the data code. The control code is first decoded and analyzed to obtain the decoding formula contained therein. The data code is decoded during a period in which the control code is being analyzed, based on plural decoding formulae one of which coincides with the decoding formula contained in the control code. Data signals decoded based on the respective decoding formulae are sent to an output selector together with the decoding formula obtained from the control code. The output selector selects a data signal which is decoded based on a decoding formula that coincides with the decoding formula obtained from the control code.