Abstract: A communication control device includes an association table updater and a correction packet transmitter. The association table updater updates, when receiving from a first wireless device a packet containing an identification number of a first communication terminal connected to the first wireless device, an association table storing an address of the first wireless device and the identification number of the first communication terminal.

Abstract: [Problem] To provide a communication system for simplifying terminal device configuration. [Solution] A communication system comprises a server and a terminal device. The server stores first information in order for the terminal device to communicate, and stores second information in order for the terminal device to connect to a network of the other bases. When the power is turned on in a normal operation, the terminal device connects to the network by using network information in a non-volatile memory unit, obtains the first information from the server, and writes the same in a volatile memory unit. Thus, the terminal device starts operation. When the power is turned on by using a particular operation, the terminal device connects to the network by using the network information in the non-volatile memory unit, obtains network information of the other bases from the server, and stores the same in the non-volatile memory unit. Thus, it is possible to connect to the network of the other bases.

Abstract: [Problem] To enable the response audio signal of one transceiver to be heard by other transceivers, in cases when a plurality of subordinate transceivers (wireless handset) are present. [Solution] A relaying device is provided with: a wireless apparatus interface having a repeater connected thereto; a signal processing unit connected to the wireless apparatus interface; a network interface connected to a network; a packet processing unit connected to the network interface; and a mixing unit provided between the signal processing unit and the packet processing unit. The packet processing unit reads out an audio signal from a packet inputted from the network interface, and outputs the audio signal as a downlink audio signal. The mixing unit inputs the downlink audio signal into the signal processing unit, and inputs an uplink audio signal into the signal processing unit. The signal processing unit outputs, to the wireless apparatus interface, the downlink audio signal and the uplink audio signal.

Abstract: An FFT processor applies the fast Fourier transform to each frame of an input signal and generates frequency domain data. A first spectrum calculator calculates the amplitude spectrum of the input signal for the individual frequency components based on the frequency domain data. A dispersion index calculator calculates a dispersion index indicating the level of dispersion of the amplitude spectrum of the input signal in the latest frames. A noise index calculator calculates a noise index indicating the level of noise contained in the input signal. A second spectrum calculator calculates the amplitude spectrum of the noise for the individual frequency components. A gain calculator calculates a spectral gain for suppressing the noise for the individual frequency components. An IFFT processor applies the inverse fast Fourier transform to the frequency domain data after multiplication by the spectral gain at a multiplier, and generates a signal to be output.

Abstract: [Problem] To conduct a process of moving a designated communication terminal belonging to a first communication system so as to belong to a second communication system without errors. [Solution] A management device is provided, which deletes information on a communication terminal of a first configuration device and then adds information of the communication terminal to the second configuration device. The management device is provided with an interface unit and a control unit. The interface unit obtains a first configuration file which stores a configuration data on a communication terminal belonging to a first communication system, and a second configuration file which stores a configuration data on a communication terminal belonging to a second communication system. The control unit deletes a configuration data of a designated communication terminal from the obtained first configuration file, and adds a configuration data of the designated communication terminal to the obtained second configuration file.

Abstract: [Problem] To provide a voice communication system which uses a communication network, and with which a terminal device is capable of listening to both a previous call and a new call, even when another call is received during communication. [Solution] Provided is a relay device which is equipped with: a network communication unit which communicates with terminal devices over a communication network; and a control unit which controls voice communication between the terminal devices. The control unit of the relay device forms a plurality of communication sessions, and allows a plurality of the terminal devices to each of the communication sessions. The terminal devices belonging to one of the communication sessions participate in communication in the communication session. The terminal devices assigned to two or more communication sessions participate in communication in any one of the communication sessions.

Abstract: An angle calculator calculates, based on acceleration detected by an acceleration sensor, a tilt angle of a transceiver with respect to the vertical direction. A selector (i) selects a first audio filter to operate if the tilt angle is less than a threshold angle, or (ii) selects a second audio filter to operate if the tilt angle is equal to or greater than the threshold angle. The second audio filter has a lower cutoff frequency that is higher than the lower cutoff frequency of the first audio filter.

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 signal input from a microphone is A-D converted by an A-D converter, is frequency differentiated by a pre-emphasis circuit, and is input to a shift control circuit. The shift control circuit includes a limiter circuit, a phase shifter, and a harmonic suppressor. The limiter circuit performs amplitude limitation so as to limit the amplitude of the input control target signal to be equal to or less than a first threshold. The phase shifter shifts, for the control target signal having the amplitude limited, a phase of a frequency component within the predetermined frequency range. The harmonic suppressor suppresses, for the control target signal phase-shifted by the phase shifter, a frequency component equal to or greater than a second threshold, and outputs an information signal that is the control target signal having the frequency component of equal to or greater than the second threshold suppressed. The modulator performs frequency modulation on a carrier wave in accordance with the information signal.

Abstract: [Problem] To provide am audio communication system configured such that a relaying device and terminal devices are connected via a communication network, and communication between terminal devices is managed on the relying device side on the basis of the priority of communications. [Solution] The relaying device is provided with a network communication unit, a control unit, and a priority information storage unit. A network communication unit communicates with a plurality of terminal devices via a communication network. A control unit transfers audio signals between terminal devices participating in a communication session.

Abstract: A relay device includes a network communication unit, a control unit, and a session table. The network communication unit receives, from terminal devices, an audio signal to which is attached information for designating the terminal device of the other party of communication. When a calling voice packet is received from one of the terminal devices, the control unit registers, in the session table, a communication session in which this terminal device and the terminal device designated by the designating information constitute participating terminals. Thereafter, the control unit transfers an audio signal received from one of the participating terminals to each of the participating terminals and, when an audio signal is received from two or more of the participating terminals at the same time, mixes the received audio signals and transmits the mixed audio signal to the participating terminals.

Abstract: [Problem] To provide an audio communication system wherein a relaying device is connected to terminal devices, which are communication devices, via a communication network and wherein the relaying device is caused to manage the group of the terminal devices. [Solution] An audio communication system comprises: a master relaying device; one or more slave relaying devices connected to the master relaying device via a communication network; and one or more terminal devices connected to each relaying device via a communication network. Each slave relaying device transfers, to the master relaying device, audio signals received from the terminal device in charge of the slave relaying device. The master relaying device transfers the audio signals, which were received from each slave relaying device, to the slave relaying devices other than that slave relaying device.

Abstract: A shift control circuit includes a first limiter circuit, a phase shifter, a first suppressor, and a reducer. The first limiter circuit limits the amplitude of a control target signal input from a microphone, having undergone A-D conversion by an A-D convener, and frequency differentiation by a pre-emphasis circuit, and having the relative intensity of harmonic components increased. The phase shifter performs, for the control target signal having undergone the amplitude limitation, phase shift on the frequency component within a first frequency range. The first suppressor suppresses, for the control target signal having undergone the phase shift, the frequency component equal to or greater than a second threshold. The reducer suppresses, for the control target signal having the suppressed frequency component, the frequency component within a second frequency range, and outputs as an information signal.

Abstract: [Problem] To enable the response audio signal of one transceiver to be heard by other transceivers, in cases when a plurality of subordinate transceivers (wireless handset) are present. [Solution] A relaying device is provided with: a wireless apparatus interface having a repeater connected thereto; a signal processing unit connected to the wireless apparatus interface; a network interface connected to a network; a packet processing unit connected to the network interface; and a mixing unit provided between the signal processing unit and the packet processing unit. The packet processing unit reads out an audio signal from a packet inputted from the network interface, and outputs the audio signal as a downlink audio signal. The mixing unit inputs the downlink audio signal into the signal processing unit, and inputs an uplink audio signal into the signal processing unit. The signal processing unit outputs, to the wireless apparatus interface, the downlink audio signal and the uplink audio signal.

Abstract: [Problem] To provide a communication system for simplifying terminal device configuration. [Solution] A communication system comprises a server and a terminal device. The server stores first information in order for the terminal device to communicate, and stores second information in order for the terminal device to connect to a network of the other bases. When the power is turned on in a normal operation, the terminal device connects to the network by using network information in a non-volatile memory unit, obtains the first information from the server, and writes the same in a volatile memory unit. Thus, the terminal device starts operation. When the power is turned on by using a particular operation, the terminal device connects to the network by using the network information in the non-volatile memory unit, obtains network information of the other bases from the server, and stores the same in the non-volatile memory unit. Thus, it is possible to connect to the network of the other bases.