Abstract: A modulator subjects an input signal to primary modulation to generate a primary modulated signal. A transmitter generates and transmits a transmission signal based on a secondary modulated signal generated from the primary modulated signal. A retransmission request receiver receives a retransmission request that contains identification information. An operator uses a data sequence that is a set of elements of a same number as a number of elements in an input signal identified by the identification information and with element values of 1 or 0 to generate operation data whose elements are values of exclusive OR of respective elements of the input signal and respective elements of the data sequence that are at same positions as positions of the respective elements of the input signal. If a retransmission request receiver receives a retransmission request, the modulator and transmitter perform the above processing using the operation data as an input signal.

Abstract: A computational processor uses a binary signal, being a set of 1- or 0-valued elements of a same number as a number of elements in an input signal, to generate computational data whose elements are exclusive OR values between each element of the input signal and a corresponding element in the binary signal at a same position. The modulator 13 modulates the input signal and the computational data according to a primary modulation scheme, and generates primary-modulated signals. An IFFT calculator applies an inverse fast Fourier transformation to the primary-modulated signals to generate inverse transformation data. A transmitter generates a baseband signal based on generated inverse transformation data whose peak-to-average power ratio matches a standard, and generates and transmits a transmission signal from the baseband signal and data specifying computations conducted to generate the inverse transformation data that matches the standard.

Abstract: When no synchronization signal is transmitted over a system bus (115), a master repeater is arbitrarily selected from a plurality of repeaters (1112 to 111n), starts transmitting a synchronization signal over the system bus (115), and transmits information to the system bus (115) in synchronization with the synchronization signal. Other slave repeaters transmit information to the system bus (115) in synchronization with the synchronization signal transmitted by the master repeater.

Abstract: A serial-parallel converter generates a subcarrier modulation signal from a modulation signal which is generated from the input signal by a modulator. An IFFT unit performs an inverse fast Fourier transformation on the subcarrier modulation signal. A divider divides a calculation result to generate first subdata. A disperser adds dispersion coefficients to elements of first subdata. A sorter generates second subdata from post-dispersion first subdata. An operator performs a predetermined calculation using elements in the same line of the post-dispersion first subdata and second subdata. A corrector subtracts correction coefficients from elements of post-average first subdata. A synthesizer arranges post-correction first subdata in positions at the time of division and synthesizes them to generate a baseband signal. A transmitter generates a transmission signal to transmit.

Abstract: Plural repeaters (1111 to 111n) are connected one another via a system bus (115), and each of which detects the state of another repeater by checking a signal transmitted over the system bus (115). When stopping the operation of home repeater (e.g., the repeater (1111)) which performs relaying process among wireless terminal devices (TA) to (TH), a secondary repeater (e.g., the repeater (1112)) set beforehand detects that the home repeater breaks down as the secondary repeater becomes unable to detect the signal over the system bus (115). The secondary repeater responds to the detection and bears the relaying process instead of the home repeater.

Abstract: A computational processor uses a binary signal, being a set of 1- or 0-valued elements of a same number as a number of elements in an input signal, to generate computational data whose elements are exclusive OR values between each element of the input signal and a corresponding element in the binary signal at a same position. The modulator 13 modulates the input signal and the computational data according to a primary modulation scheme, and generates primary-modulated signals. An IFFT calculator applies an inverse fast Fourier transformation to the primary-modulated signals to generate inverse transformation data. A transmitter generates a baseband signal based on generated inverse transformation data whose peak-to-average power ratio matches a standard, and generates and transmits a transmission signal from the baseband signal and data specifying computations conducted to generate the inverse transformation data that matches the standard.

Abstract: In an FSK receiver according to the present invention, a correction operation for a DC offset component is performed based on a maximum value and a minimum value of a demodulation signal. If a difference between the maximum and minimum values is less than a predetermined threshold value TH1, the correction operation is halted. Thus, the FSK receiver can rapidly perform an appropriate offset removal from a multi-level FSK signal.

Abstract: Wireless terminal devices (TA) to (TH) each detects whether channel information received from each of repeaters (1111) to (111n) indicates an occupied state or an idle state, and when detecting a channel in an idle state, writes identification information of that channel in a RAM (23). The wireless terminal devices (TA) to (TH) each selects a piece of identification information of a channel among plural pieces of identification information of a channel written in the RAM (23) to start making a call to a channel of the selected identification information.

Abstract: A modulator 11 modulates an input signal in a predetermined modulation manner to generate a primary modulation signal. The serial-parallel converter 12 applies a serial-parallel conversion to a predetermined number of complex numbers and the primary modulation signal, and assigns the converted complex numbers and primary modulation signal to subcarriers to generate a subcarrier modulation signal. An IFFT calculator 13 applies an IFFT to the subcarrier modulation signal. A decomposer 14 decomposes a calculation result into real-part data and imaginary-part data. A real-part calculator 151 subtracts the average value of the maximum value and minimum value of elements of the real-part data from each element of the real-part data. An imaginary-part calculator 152 carries out a similar calculation on the imaginary-part data. A combiner 16 combines the calculated real-part data and imaginary-part data to generate a baseband signal. A transmitter 17 transmits a transmission signal generated from the baseband signal.

Abstract: A portable electronic device includes a housing, a drop detection part located on the housing that detects when the device is dropped into water, a light emission part located within the housing, and a light-emission control circuit located within the housing that controls emission of light from the light emission part when the drop detection part detects that the device is dropped into the water. The device is configured to have a buoyancy, and the buoyancy and a center of gravity of the device are configured to let the device float stably in a left-right lateral direction.

Abstract: A modulator generates modulation signals from input signals. A combiner arranges subcarrier modulation signals based on the modulation signals in order thereby to generate a compound matrix. The shifter shifts elements of each row of the compound matrix to generate shift matrix. An IFFT calculator subjects the shift matrix to inverse fast Fourier transformation to generate inverse transformation matrix. A maximum detector detects a column with a highest peak-to-average power ratio among columns of the inverse transformation matrix. A minimum detector detects an inverse transformation matrix including a column with a lowest peak-to-average power ratio among columns of inverse transformation matrices detected by the maximum detector. A transmitter generates a transmission signal based on baseband signals generated from each column of the inverse transformation matrix detected by the minimum detector, and transmits the transmission signal.

Abstract: A communication apparatus comprises an inserter that inserts an element having a value of 0 or nearly 0 into a predetermined position of a modulated signal to generate inserted data; an operator that adds a pilot signal comprising a data series of which the elements at the positions corresponding to the predetermined positions in the modulated signal are multiplied by a first amplitude coefficient and the elements other than the elements multiplied by the first amplitude coefficient are multiplied by a second amplitude coefficient to the inserted data to generate a post-operation data; an IFFT unit that performs IFFT on the post-operation data; and a transmitter that generates a baseband signal based on the post-operation data on which the IFFT is performed and transmits a transmission signal generated from the baseband signal.

Abstract: A modulator modulates an input signal by a predetermined modulation scheme to generate a modulation signal. A serial-parallel converter performs serial-parallel conversion of the modulation signal and assigns the modulation signal to subcarriers with frequency components orthogonal to each other, thereby generating a subcarrier modulation signal. A synthesizer generates a baseband signal from the subcarrier modulation signal based on a predetermined transformation matrix. The predetermined transformation matrix is a matrix which indicates inverse discrete Fourier transformation and is divided into a plurality of square matrices identical in the number of rows and the number of columns, and in which elements other than elements of a plurality of diagonally positioned square matrices are set to 0. A transmitter generates a transmission signal from the baseband signal, and transmits the transmission signal to another apparatus via an antenna.

Abstract: A relaying device includes an uplink interface that continuously receives an audio signal in communication, a wireless apparatus interface to which a repeater acting as a wireless relaying apparatus is connected, a voice buffer that buffers the audio signal, and a control unit. The control unit performs a VOX processing of detecting whether or not a level of the audio signal is equal to or higher than a preset threshold. When the level of the audio signal is equal to or higher than the threshold, the control unit starts buffering the audio signal in the voice buffer, and requests the repeater to reserve a channel. After receiving, from the repeater, a reply indicating that a channel has been reserved, the control unit reads the buffered audio signal from the voice buffer, and transfers this audio signal to the repeater.

Abstract: The present invention relates to a relaying device which performs the individual calling in response to not only a call incoming from a telephone but also a call incoming from a transceiver. When receiving a communication request from another device over a network, the relaying device determines if this communication request is accompanied by the wireless-device specifying information (ID). When the communication request is not accompanied by the ID, the relaying device sends a signal for prompting another device to input the ID. When the ID is sent in response to the sent signal, the relaying device instructs the relaying wireless device to call the wireless terminal device specified by this ID. In addition, when the communication request is accompanied by the ID, the relaying device instructs the relaying wireless device to call the wireless terminal device specified by this ID.

Abstract: A relaying device is provided, which can mediate by using communications of a wireless apparatus without clipping off the beginning of verbal communication. The relaying device includes: a network interface that receives an audio signal as a group of packet trains via a network; a wireless apparatus interface to which a wireless apparatus is connected; a voice buffer that temporarily stores the audio signal; and a control unit that starts temporarily storing the audio signal in the voice buffer and requests the wireless apparatus to reserve a channel, when a leading packet of the group of packet trains is received, and that reads the temporarily stored audio signal from the voice buffer and transfers the audio signal to the wireless apparatus, after receiving from the wireless apparatus a reply indicating that a channel has been reserved.

Abstract: A preamble generating apparatus used for synchronization of a reception apparatus in an orthogonal frequency division multiplexing system and generating a preamble to be added to a beginning of data at a time of communication, receives preamble length identifying information and position specifying information, and generates a plurality of elements constituting a preamble according to a predetermined sequence based on those information. The preamble generating apparatus creates a preamble model, and generates a plurality of preambles by setting the generated elements at positions of elements in element deciding information included in the preamble model, the positions indicating elements in the preamble model which are to be used in data communication.

Abstract: A wireless terminal device (TA) receives a downlink signal that is repeatedly transmitted from a pre registered home repeater when requesting communication, specifies an idle channel based on idle channel information that is included in the downlink signal, and using the frequency of the uplink signal of the idle channel requests communication permission from the relay device that provides the idle channel. When communication permission cannot be received from the relay device from which communication permission was previously requested, the wireless terminal device (TA) uses the same frequency as the frequency of the downlink signal from the home repeater to transmit a signal to the wireless terminal device (TB) of an intended other party requesting communication.

Abstract: The communication apparatus comprises a modulator that modulates an input signal to generate a modulated signal; an inserter that inserts a predetermined element into the modulated signal at a predetermined position to generate inserted data of which the number of elements is equal to a size of Fast Fourier Transformation (FFT); a calculator that calculates Peak-to-Average Power Ratio (PAPR) of a baseband signal corresponding to the inserted data; and a transmitter transmits a transmission signal corresponding to the baseband signal based on the calculated PAPR.

Abstract: A modulator generates a modulation signal from an input signal. A serial-parallel converter generates a subcarrier modulation signal from the modulation signal. A first operator generates first data by multiplying a predetermined non-singular matrix by the subcarrier modulation signal. A second operator generates second data by multiplying a matrix calculated by multiplying a predetermined transformation matrix by the predetermined non-singular matrix by the subcarrier modulation signal, or multiplying the predetermined transformation matrix by the first data. A synthesizer generates a baseband signal from data obtained by adding the second data to the first data, or data obtained by subtracting the second data from the first data. A transmitter generates a transmission signal from the baseband signal, and transmits the transmission signal to another apparatus via an antenna.