Abstract: An underwater information visualization device, which is installed on a moving body such as a ship traveling near a water surface and visualizes and displays information about fish in the water and the seabed using an ultrasonic wave, includes circuitry that generates a pseudo noise sequence signal and a modulation circuit that modulates a carrier signal to form a transmission signal, emits a transmission signal as an ultrasonic wave into the water, receives an echo of an ultrasonic wave, determines an echo corresponding to a transmission signal by subjecting the echo to correlation processing with a pseudo noise sequence signal, displays an output signal. The display simultaneously displays multiple reception signals on a screen, and a period of transmission signals is (2D/Vu) or less when an underwater sonic wave speed is Vu and a distance to the seabed is D.

Abstract: An underwater information display device, which transmits an ultrasonic wave, receives an echo reflected by an underwater target, and displays the echo, includes: a transmission signal generation part that forms a transmission signal sequence in which at least two temporally adjacent transmission signals are converted so as to be identifiable at the time of reception and have different intervals; a transmission part that emits a transmission signal as an ultrasonic wave into water; a reception part that receives an echo and outputs a reception signal; a storage part that stores multiple reception signals corresponding to temporally continuous transmission signals; an interpolation part to which reception signals stored in the storage part are supplied and which replaces a ghost component included in the reception signals with an echo of another temporally nearby transmission signal; and a display part that draws reception signals including a signal interpolated by the interpolation part.

Abstract: An underwater information visualization device, which is installed on a moving body such as a ship traveling near a water surface and visualizes and displays information about fish in the water and the seabed using an ultrasonic wave, includes circuitry that generates a pseudo noise sequence signal and a modulation circuit that modulates a carrier signal to form a transmission signal, emits a transmission signal as an ultrasonic wave into the water, receives an echo of an ultrasonic wave, determines an echo corresponding to a transmission signal by subjecting the echo to correlation processing with a pseudo noise sequence signal, displays an output signal. The display simultaneously displays multiple reception signals on a screen, and a period of transmission signals is (2D/Vu) or less when an underwater sonic wave speed is Vu and a distance to the seabed is D.

Abstract: An echo measuring apparatus has: a transmission signal forming unit for forming a transmission signal by a pseudo noise sequence signal; a transmitting unit for transmitting the transmission signal as an ultrasonic wave into the water; a receiving unit for receiving an echo of the ultrasonic wave; and a correlator for discriminating the echo corresponding to the transmission signal by executing a correlating process to the echo by the pseudo noise sequence signal and measuring a distance to a measurement target on the basis of a time difference between the transmission signal and the echo, wherein assuming that a velocity of a sound wave in the water is equal to Vu and the distance to the measurement target is equal to D, a period of the transmission signal includes a case where it is equal to or less than (2D/Vu).

Abstract: An echo sounding apparatus which is attached to a moving object and detects a measurement target in the water, including: a transmission signal forming unit that generates a pseudo noise sequence signal and forms a transmission signal by modulating a carrier signal by the pseudo noise sequence signal of transmission timing; a transmitting unit that transmits the transmission signal as an ultrasonic wave into the water; a receiving unit that receives a reception signal including a true echo, a ghost of the transmission signal, and a ghost of the reception signal; a correlator that measures a distance to the measurement target based on a time difference between the transmission signal and the true echo by executing a correlating process to the reception signal by the pseudo noise sequence signal; and a ghost eliminating circuit that eliminates the ghost of the transmission signal and/or the ghost of the reception signal.

Abstract: An echo measuring apparatus has: a transmission signal forming unit for forming a transmission signal by a pseudo noise sequence signal; a transmitting unit for transmitting the transmission signal as an ultrasonic wave into the water; a receiving unit for receiving an echo of the ultrasonic wave; and a correlator for discriminating the echo corresponding to the transmission signal by executing a correlating process to the echo by the pseudo noise sequence signal and measuring a distance to a measurement target on the basis of a time difference between the transmission signal and the echo, wherein assuming that a velocity of a sound wave in the water is equal to Vu and the distance to the measurement target is equal to D, a period of the transmission signal includes a case where it is equal to or less than (2D/Vu).

Abstract: A first communication device performs a first, a second, and a third authentication processing for a second communication device, a authentication station sends to the first communication device a confirmation signal indicating that a person's identity is confirmed, when the authentication station succeeds the authentication of the second communication device, so that the authentication station validates the cancellation of a usage restrictions of the controlled device imposed by the first communication device based on the cancellation permission signal.

Abstract: A security system capable of safely performing home device state check or operation. In the security system, a mobile telephone module of a mobile telephone transmits M-series data (call signal) to home device modules provided in home devices such as a door lock and home electric appliances. In response to this call, the home device module returns a home device ID to the mobile telephone module. The mobile telephone module authenticates the home device module according to the home device ID and after authentication, returns a mobile telephone ID and state check or operation command to the home device module. The home device module authenticates the mobile telephone module according to the mobile telephone ID. When this mutual authentication is complete, the home device module performs the home device state check or operation according to the command and returns the result to the mobile telephone module.

Abstract: The present invention provides an authentication card inserted to a portable device. The authentication card 1 is inserted (installed) in a cellular phone 30 and the authentication card 2 is inserted (installed) in a PDA 40. The authentication card 1 comprises an identification code transmission unit 10 and the authentication card 2 comprises a usage restriction cancellation unit 20. The units 10 and 20 exchange the identification code by means of wireless signal and mutually authenticate the identification code mutually. In case that the PDA 40 is moved more than the predetermined distance from the cellular phone 30 and the reception level of signal from the unit 10 received by the unit 20 is smaller than the predetermined value, or the unit 20 can not authenticate the identification code of the unit 10, the unit 20 stops transmission of the usage restriction cancellation signal to the PDA 40.

Abstract: A mobile communication terminal, which can be found promptly when lost, misplaced or stolen, is provided.

Abstract: A first communication device performs a first, a second, and a third authentication processing for a second communication device, a authentication station sends to the first communication device a confirmation signal indicating that a person's identity is confirmed, when the authentication station succeeds the authentication of the second communication device, so that the authentication station validates the cancellation of a usage restrictions of the controlled device imposed by the first communication device based on the cancellation permission signal.

Abstract: Non-reception-controlled area information is stored in the non-reception-controlled area storage section of the reception control device for each mobile device ID. When the reception control device receives the disconnection signal and position information from the mobile device in accordance with the mobile device moving away from the key terminal, the presence/absence determination section determines whether or not the mobile device is within the aforementioned area. As a result of the determination, if the current position of the mobile device is within the aforementioned area, control for enabling reception for the mobile device is performed, and if the current position is outside the aforementioned area, control for disabling reception for the mobile device is performed.

Abstract: A wireless authentication system performs authentication by means of radio signals, and has a use restriction function for an appliance in order to prevent illegal use or unauthorized use thereof. The system carries out multiple level authentication and settlement relating to payment cards, including credit cards and has functions for locking and unlocking a container, including a locker, whereby not only can a user deposit his or her own luggage, but luggage can also be deposited and collected by different persons.

Abstract: A security system capable of safely performing home device state check or operation. In the security system, a mobile telephone module of a mobile telephone transmits M-series data (call signal) to home device modules provided in home devices such as a door lock and home electric appliances. In response to this call, the home device module returns a home device ID to the mobile telephone module. The mobile telephone module authenticates the home device module according to the home device ID and after authentication, returns a mobile telephone ID and state check or operation command to the home device module. The home device module authenticates the mobile telephone module according to the mobile telephone ID. When this mutual authentication is complete, the home device module performs the home device state check or operation according to the command and returns the result to the mobile telephone module.

Abstract: The present invention provides an authentication card inserted to a portable device. The authentication card 1 is inserted (installed) in a cellular phone 30 and the authentication card 2 is inserted (installed) in a PDA 40. The authentication card 1 comprises an identification code transmission unit 10 and the authentication card 2 comprises a usage restriction cancellation unit 20. The units 10 and 20 exchange the identification code by means of wireless signal and mutually authenticate the identification code mutually. In case that the PDA 40 is moved more than the predetermined distance from the cellular phone 30 and the reception level of signal from the unit 10 received by the unit 20 is smaller than the predetermined value, or the unit 20 can not authenticate the identification code of the unit 10, the unit 20 stops transmission of the usage restriction cancellation signal to the PDA 40.

Abstract: A mobile communication terminal, which can be found promptly when lost, misplaced or stolen, is provided.

Abstract: Non-reception-controlled area information is stored in the non-reception-controlled area storage section of the reception control device for each mobile device ID. When the reception control device receives the disconnection signal and position information from the mobile device in accordance with the mobile device moving away from the key terminal, the presence/absence determination section determines whether or not the mobile device is within the aforementioned area. As a result of the determination, if the current position of the mobile device is within the aforementioned area, control for enabling reception for the mobile device is performed, and if the current position is outside the aforementioned area, control for disabling reception for the mobile device is performed.

Abstract: A wireless authentication system performs authentication by means of radio signals, and has a use restriction function for an appliance in order to prevent illegal use or unauthorized use thereof. The system carries out multiple-level authentication and settlement relating to payment cards, including credit cards and has functions for locking and unlocking a container, including a locker, whereby not only can a user deposit his or her own luggage, but luggage can also be deposited and collected by different persons.

Abstract: A use prohibition system which can disable a cellular phone or any other device if it separates more than a predetermined distance from the user, and at the same time give a warning to the user. It includes an identification signal transmission unit and a use prohibition mode canceling unit attached or mounted to the cellphone. Each unit has a transmitter and a receiver. The receiver of the canceling unit receives an ID code signal from the transmission unit and produces, based on the ID signal received, a use prohibition canceling signal. The canceling unit returns a confirmation signal to the transmission unit. If the two units separate more than a predetermined distance from each other, the levels of the ID signal and the confirmation signal received by the respective units drop below a predetermined value. Thus, the canceling unit stops producing the canceling signal to disable the cellphone, while the transmission unit sounds an alarm.

Abstract: The present invention provides flexibility in the shape and material of the cleaning vessel, enables high-power transmission of ultrasonic waves, and reduces audible noise generation. An ultrasonic cleaning machine according to the invention comprises an acoustic lens mounted above an ultrasonic transducer which is immersed in oil held within an external tank as well as a cleaning vessel holding a cleaning liquid further above the acoustic lens so that ultrasonic waves produced by the ultrasonic transducer converge at a point within the cleaning liquid. In one form of the invention, the cleaning vessel is eliminated and the cleaning liquid is held directly in the external tank.