Abstract: The present invention aims at providing a portable radio communication apparatus in which forming of a message is easy. The portable radio communication apparatus is provided with a novel pre-message memory formed of a ROM or the like stored in which are fixed messages each consisting of fixed statements or fixed words as “CALL OFFICE AT XX:XX”. A transmitting message may be readily formed by selecting any of the fixed messages.

Abstract: The present invention aims at providing a portable radio communication apparatus in which forming of a message is easy. The portable radio communication apparatus is provided with a novel pre-message memory formed of a ROM or the like stored in which are fixed messages each consisting of fixed statements or fixed words as “CALL OFFICE AT XX:XX”. A transmitting message may be readily formed by selecting any of the fixed messages.

Abstract: The present invention aims at providing a portable radio communication apparatus in which forming of a message is easy. The portable radio communication apparatus is provided with a novel pre-message memory formed of a ROM or the like stored in which are fixed messages each consisting of fixed statements or fixed words as “CALL OFFICE AT XX:XX”. A transmitting message may be readily formed by selecting any of the fixed messages.

Abstract: A signal processing apparatus is disclosed which includes a low speed ROM (9) for storing a plurality of signal procedures, a high speed RAM (4) used by a digital signal processor DSP (5), a control processor CPU (8) for transferring a signal procedures from the low speed ROM (9) to the high speed RAM (4), a digital signal processor DSP (5) for processing the signal procedures loaded in the high speed RAM (4). Accordingly, a signal processing apparatus of the present invention is constructed with low cost memory, then reduces manufacturing cost of the apparatus.

Abstract: The present invention relates to a mobile satellite communication system. It is the object of the invention to provide a mobile satellite communication system capable of monitoring a location of a mobile station by data on its absolute location on the ground L, in lieu of relative monitoring thereof with respect to satellite base stations, to thereby ensure an effective location registration and suppress an increase of traffic in communication lines arising from location registrations. The satellite base stations are each equipped with a navigation signal generator for issuing navigation signals. The mobile station detects its absolute location on the ground L based on the navigation signals received from the satellite base stations, and executes its location registration procedure by use of identification data (communication zone ID) associated with the communication zone in which it lies and which is determined by the thus detected absolute location data.

Abstract: A radio communication apparatus for transmitting and receiving a digital signal using a radio line which includes a memory means for storing a plurality of signal procedures in which each procedure has different ratio of the information code bits and error correction code bits.A signal processing circuit executes one of the procedures stored in the memory means according to line quality. Accordingly, the radio communication apparatus of the present invention selects the optimum procedure according to the line quality, and then reduces the consumed power.

Abstract: A radio communication apparatus used for both digital communications and analog communications is disclosed which comprises a digital signal processor DSP (4) which processes many kinds of digital signals according to a plurality of signal procedures (55,56,57,58) stored in the ROM (5). In the present invention, since the radio communication apparatus processes many kinds of procedures (55,56,57,58) stored in the ROM (5), the size of the apparatus becomes small and weight becomes light.

Abstract: Disclosed herein is a control device which is suitable for use in a radio communication apparatus employed in a radio communication system using a TDMA method. A timer circuit for circulating a counted value in a period corresponding to a period of time required to transmit a TDMA frame supplies the counted value to a strobe signal generating circuit. The strobe signal generating circuit supplies a strobe signal to a radio unit of the radio communication apparatus when a preset value coincides with the counted value of the timer circuit. Thus, since the strobe signal is generated without the intervention by a control circuit made up of a CPU or the like, it can be outputted in strict timing.

Abstract: A mobile telephone device comprises a separate paging signal channel in addition to the conventional transceiver channels which process voice signals. The paging signal channel has a lower power consumption level than the transceiver channels. A power supply control device shuts off power to the conventional transceiver channels when in a standby mode, i.e. when waiting for an incoming call, and applies power to the paging signal channel instead. Therefore, power consumption is reduced in the standby mode and consequently, the operating time of the battery is extended. Power is applied to the transceiver channels during voice communication periods. A calling party's telephone number received in the paging signal channel is stored and displayed. A control unit has the capability of immediately returning the calling party's call from the telephone number so stored and displayed.

Abstract: A telephone set and a handset are provided which are capable for preventing acoustic coupling between a telephone transmitter and a telephone receiver by isolating the transmitter from the region of the receiver.

Abstract: A road navigation system comprises a plurality of guidance information transmitter systems disposed along a route, each transmitter system generating current location information in the form of extremely-low-powered electric waves, and a guidance signal generator system for providing guidance information for the benefit of a user. The guidance signal generator system comprises a receiver unit for receiving the current location information from the guidance information transmitter system, an input unit for inputting destination information, a memory unit for storing available map information and the inputted destination information which can be prepared as route information to be traced, a data processor unit for comparing the route information with the current location information received by the receiver unit and for producing the guidance information, and an output unit for communicating the guidance information to the user.

Abstract: A mobile telephone device comprises a separate paging signal channel in addition to the conventional transceiver channels which process voice signals. The paging signal channel has a lower power consumption level than the transceiver channels. A power supply control device shuts off power to the conventional transceiver channels when in a standby mode. i.e. when waiting for an incoming call, and applies power to the paging signal channel instead. Therefore, power consumption is reduced in the standby mode and consequently, the operating time of the battery is extended. Power is applied to the transceiver channels during voice communication periods. A calling party's telephone number received in the paging signal channel is stored and displayed. A control unit has the capability of immediately returning the calling party's call from the telephone number so stored and displayed.