Abstract: A communication system for transmitting a transmission signal in digital form from a transmitter to a receiver is disclosed. The transmitter includes a modulation part modulating a carrier wave in accordance with the transmission signal according to frequency modulation, a digital conversion part performing 1-bit quantization on the modulated signal obtained as a result of the modulation in the modulation part, and a transmission part transmitting digital data into which the modulated signal is converted in the digital conversion part. The receiver includes a reception part receiving the digital data transmitted from the transmission part, and a demodulation part demodulating the digital data received by the reception part according to the frequency modulation.

Abstract: In a broadcast receiving system, a first antenna receives a broadcast signal of a first frequency band and a second antenna receives a signal of a second frequency band different from the first frequency band. A frequency conversion unit converts the signal of the second frequency band into a second signal of the first frequency band. A selection unit selects one of the broadcast signal output from the first antenna and the second signal output from the frequency conversion unit. A demodulation unit demodulates the one of the broadcast signal and the second signal selected by the selection unit.

Abstract: In a broadcast receiving system, a first antenna receives a broadcast signal of a first frequency band and a second antenna receives a signal of a second frequency band different from the first frequency band. A frequency conversion unit converts the signal of the second frequency band into a second signal of the first frequency band. A selection unit selects one of the broadcast signal output from the first antenna and the second signal output from the frequency conversion unit. A demodulation unit demodulates the one of the broadcast signal and the second signal selected by the selection unit.

Abstract: A communication system for transmitting a transmission signal in digital form from a transmitter to a receiver is disclosed. The transmitter includes a modulation part modulating a carrier wave in accordance with the transmission signal according to frequency modulation, a digital conversion part performing 1-bit quantization on the modulated signal obtained as a result of the modulation in the modulation part, and a transmission part transmitting digital data into which the modulated signal is converted in the digital conversion part. The receiver includes a reception part receiving the digital data transmitted from the transmission part, and a demodulation part demodulating the digital data received by the reception part according to the frequency modulation.

Abstract: A video game control adapter includes a reception adapter that attaches to a connector of a video game device that displays a game image on a video display; and a transmission adapter that transmits a control signal toward the reception adapter when a switch built into a toy to which the transmission adapter attaches is switched ON.

Abstract: A CATV tuner apparatus includes a first low-noise amplifier which amplifies a level of an input signal received at an input terminal, the first low-noise amplifier having an adequately small noise figure to allow the received input signal to be amplified with no substantial degradation of a carrier-to-noise ratio of the input signal. An automatic gain control detects the level of the signal amplified by the first low-noise amplifier and adjusts an amplitude of the signal before passing the signal through the automatic gain control. A band-pass filter eliminates out-of-band signal components from the signal received from the automatic gain control and passes only in-band signal components through the band-pass filter. A second low-noise amplifier amplifies a level of the signal received from the band-pass filter.

Abstract: A navigation data receiving device is so designed that the navigation data down-loaded in the hard disk of a portable personal compute is received through internet. The device includes a modem block 3 which adapted to receive navigation data through the internet; and a GPS block 22 adapted to receive GPS data of a GPS system. The modem block and the GPS block are built in the same PC card.

Abstract: A video game control adapter includes a reception adapter that attaches to a connector of a video game device that displays a game image on a video display; and a transmission adapter that transmits a control signal toward the reception adapter when a switch built into a toy to which the transmission adapter attaches is switched ON.

Abstract: An attaching mechanism for a GPS antenna is disclosed. The attaching mechanism comprises a clip for gripping a plate-shaped member and having a shaft supporting member, a shaft in which one end thereof is supported by the shaft supporting member, and a base member fixed to the other end of the shaft and on which a GPS antenna is mounted.

Abstract: A position recognition device that outputs data according to a position has a GPS unit for detecting position, an audio input/output unit for inputting and outputting audio and a memory unit for storing data. Audio data as well as corresponding position data are combined, recorded and stored in the memory unit. When a present position as measured by the GPS unit matches position data stored with the audio data, the position recognition device reproduces the audio data corresponding to the position, making it possible to output essential data at the position.

Abstract: A FM multiple signal receivable navigation apparatus is disclosed. A GPS signal receiving antenna unit and a GPS signal receiver unit are electrically connected by a coaxial cable. One end of the coaxial cable is connected with the GPS signal receiving antenna unit, and the other end of the cable is connected with the GPS signal receiver unit through a connector. A shield conductor of the coaxial cable is served as a FM multiple signal receiving antenna. The shield conductor is connected with a FM multiple signal receiver unit through a noise reduction member. The connector can be replaced by a PCMCIA (Personal Computer Memory Card International Association) card.

Abstract: An attaching mechanism for a GPS antenna is disclosed. The attaching mechanism comprises a clip for gripping a plate-shaped member and having a shaft supporting member, a shaft in which one end thereof is supported by the shaft supporting member, and a base member fixed to the other end of the shaft and on which a GPS antenna is mounted.

Abstract: A navigation system comprises: an antenna 12 which receives radio waves from a GPS satellite; a controller 15 which perform various operations to detect the present position of the car from the output signal of the antenna 12; and an image display 17 which, being controlled by the controller, displays a map, the present position of the car, etc., and a traveling-direction indicator 30 which includes a sign section made up of arrow marks or triangular marks to indicate a direction in which the car should move on. With the system, as the car comes near a branching guide point such as a crossing, the controller 15 operates to cause the sign section of the traveling-section indicator 30 to turn on or flicker to indicate a direction in which the car should move one.

Abstract: An antenna unit and a receiver having such an antenna are disclosed. The antenna includes an antenna body; a first antenna provided on the antenna body for receiving signals transmitted from satellites; at least one second antenna provided on the antenna body for receiving signals transmitted over the earth; a mixer provided in the antenna body for mixing or combining the signals received by the first and second antennas to output the mixed signals as a single output. Further, the receiver includes, in addition to these elements of the antenna unit, a signal separating device for separating the mixed signals into the signal received by the first antenna and the signal received by the second antenna, respectively and then outputting them; and a single cable which connects the mixer and the single separating device to supply the mixed signals thereto.

Abstract: An antenna unit for use in a navigation system includes a bottom cover and a unit case, a circuit board and an antenna main body are stored in the bottom cover, a cylindrical storage portion in the bottom cover is for storing the circuit board and the antenna main body therein, the cylindrical storage portion being formed integrally with the surface of the bottom cover, a cylindrical joint portion being threaded with the cylindrical storage portion, said cylindrical joint portion being formed integrally in the unit case, and the cylindrical joint portion being threaded with the cylindrical storage portion.

Abstract: A hermetically sealed case, has a space between a top case and a bottom case which can be completely sealed by means of a waterproof packing, and in which an area around a connecting cable is completely sealed. A first case having an annular projection formed at the periphery thereof is assembled to a second case having an annular groove having a shape corresponding to that of the projection of the first case formed at the periphery of the second case. An elastic member is provided between the projection of said first case and the groove of said second case. The width of said projection is smaller than the width of said groove, and said projection is fitted within said groove in a transverse direction. The elastic member deflects toward the groove, that is, deflects such that the ends of the elastic member are drawn toward the projection. Line contact is established between the corners of the projection and the elastic member, and also between the corners of the groove and the elastic member.

Abstract: An integral type flat antenna provided with a converter function includes an antenna element having a feeding point and an integrally formed multilayered substrate for supporting the antenna element thereon. The multilayered substrate includes a grounding plane layer on which the antenna element is mounted, a first insulating layer provided below the grounding plane layer, a second insulating layer positioned below the first insulating layer and provided with a frequency conversion circuit for carrying out a converter function on frequency of received signals, the frequency conversion circuit having a signal input portion which is positioned at one end of the second insulating layer, and a conducting layer provided between the first and second insulating layers for connecting the feeding point of the antenna element to the signal input section of the frequency conversion circuit.

Abstract: An antenna unit for a car navigation device includes a unit casing accommodating a circuit board and an antenna body and having a bottom cover in which a bottom recess is formed. A permanent magnet ring magnetically held on a back yoke is fixedly set in the bottom recess, the permanent magnet ring being used to magnetically hold the bottom cover on the surface of an object so that the antenna unit is detachably mounted on the object. In the antenna unit, an adhesive seal is bonded to the of the permanent magnet ring which surface confronts the surface of the object.

Abstract: There is provided a flat antenna apparatus in which a low-noise amplifier provided therein does not generate an abnormal oscillation, and a case and a ground pattern formed on a circuit board are reliably connected to each other by means of a simple construction. A flat antenna element is mounted on a circuit board. The circuit board has an amplifying circuit for amplifying a radio frequency received from the flat antenna element. A case and the flat antenna element are attached to opposite sides of the circuit board. A tab formed on a peripheral edge of the case is inserted into a slot formed on the circuit board, the tab being soldered to fix the case on the circuit board.