Sharp Kabushiki Kaisha Corporation

Masao Miyazaki

Tomozo Ohta

Naoki Okamoto

Takeshi Okamoto

Takamitsu Kitayama

Takahiro Chihara

Hiroshi Nakano

Katsutoshi Ishikura

Waho Oh

Hiroyuki Takebe

Masamori Tokuda

Itsuki Kouchi

A folding portable terminal which can be changed into a desired shape depending on applications of functions such as a telephone, a digital camera, and the like. A folding portable terminal () comprises a case () with a display section () and a case () with an operating section (), and the cases are foldably linked through a hinge mechanism. The hinge mechanism comprises a first hinge section () formed by providing a first rotation axis at substantially the center of the case () that can be rotated about the first rotation axis in the folding or opening direction relative to the case (); a second hinge section () formed by providing a second rotation axis at substantially the upper end part of the case () so as to be parallel to the first rotation axis, the case () being rotated in the folding or opening direction relative to the case (); and means () for linking both ends of the first rotation axis and both ends of the second rotation axis. The hinge mechanism enables the display section () and the operating section () to be folded without being faced each other, and a user can operate the operating section () or view the display section () in the folded state.

Folding portable terminal

Portable wireless equipment

A dual-mode cellular telephone system which is capable of suppressing a narrow-band disturbing signal appearing in a mobile station of a dual-mode cellular telephone system adapted for both an analog system and a digital CDMA system. A CDMA signal from a CDMA base station, and a narrow-band signal from an analog system are received through an antenna by a receiver, whereby they are amplified, subjected to frequency conversion, and input to a variable notch filter. A disturbing signal detection circuit supplies the variable notch filter with a control signal for varying its frequency. Namely, the disturbing signal detection circuit detects a case that an output level of the variable notch filter is at a minimum by changing the notch frequency via a series of sweeping control signals. A control signal at which the output level of the variable notch filter is at a minimum is then fed to the variable notch filter, thereby effectively suppressing any intermodulation distortions present in the mobile station.

Dual-mode cellular telephone system

A GPS position measuring system includes at least one mobile station and a base station associated with the mobile station. The mobile station is provided with an antenna for receiving one or more GPS signals from the corresponding GPS satellites, an amplifying and frequency converting circuit for amplifying the received signal and converting the amplified GPS signal into a signal on an IF band, an analog-to-digital converter for converting the signal on the IF band into a digital signal, and a writing unit for writing the digital signal into a memory card in order to transfer the digital signal to the base station.

System for measuring position by using global positioning system and

An AFC circuit stabilizes the frequency of an intermediate frequency signal to be applied to a demodulation circuit. A frequency conversion circuit responds to a local oscillation signal generated from a voltage-controlled oscillation circuit to convert the frequency of a digital modulation signal and applies the converted frequency to the demodulation circuit. A carrier reproduction circuit in the demodulation circuit reproduces the carrier of the intermediate frequency signal to output a synchronizing detection signal. The frequency of the reproduced carrier is frequency-divided by a frequency dividing circuit. A frequency division output thereof is counted by a counter for a definite period. Data is outputted from a microprocessor in response to a count output of the counter and the synchronizing detection signal, and the data is then converted into an AFC voltage by a D/A converter. The converted voltage is supplied as a control voltage to the voltage-controlled oscillation circuit. A stable intermediate frequency signal can be obtained by frequency-dividing the frequency of the carrier and counting the frequency division output thereof.

Automatic frequency control circuit

An MSK signal demodulating circuit including a carrier reproducing circuit for reproducing a carrier phase-synchronized with a component of a mark frequency or a space frequency of an MSK signal, a detector for performing synchronous detection of the MSK signal by means of the reproduced carrier, an identification circuit for converting an analog output from this detector into serial digital data, and a serial-parallel conversion circuit for converting the serial digital data into I, Q parallel data.

MSK demodulator using one synchronous detector

A frame synchronization stabilizer for stabilizing frame synchronization of received data has a generation circuit for generating a reference pattern which is the same as a predetermined frame synchronization pattern contained in data being transmitted. The stabilizer further has a comparison circuit for comparing, bit by bit, a data pattern in a synchronization pattern area of each frame of the received data with the reference pattern from the generation circuit. The comparison circuit outputs a mismatch pulse each time when a mismatch bit is detected by the comparison, and outputs a match pulse each time when it is detected that the data pattern is fully matched with the reference pattern. The number of the mismatch pulses from the comparison circuit is counted by a first counter. The first counter outputs an out-of frame detection signal when a counted value exceeds a particular value and is reset based upon the match pulse from the comparison circuit.

Frame synchronization stabilizer

A mobile navigation system using a communication system between at least one mobile object and a key station. The navigation system includes a unit mounted on the mobile object for determining the position of the mobile object, and a unit mounted on the mobile object for transmitting data representative of the determined position to the key station via the communication system. The navigation system further includes a data base unit mounted in the key station for storing map data, a unit mounted in the key station for deriving map data of an area including the position of the mobile object from the data base unit, in response to the transmitted position data, a unit mounted in the key station for transmitting data including the derived map data to the mobile object via the communication system, and a unit mounted on the mobile object for displaying a composite image composed of the position data of the mobile object and the map data, in response to the transmitted data from the key station.

Mobile object navigation system

A microwave converter comprises circuit components formed on the outer surfaces of a three-dimensional body. The inner surfaces of the body constitute a grounding surface. A local oscillator is disposed on one of the inner surfaces. The three-dimensional body may be an electrically conductive body having a hollow space in which the local oscillator is disposed.

Growing community of inventors

Nara, Japan

Masao Miyazaki