摘要:
A control apparatus for controlling a memory unit having an electrically erasable nonvolatile memory for storing information used in a process in an electrical equipment and a flash memory storing a processing program for executing the process in the electrical equipment. The control apparatus includes a loading program for loading information into the flash memory, which program is stored in the electrically erasable nonvolatile memory, a memory selecting circuit for selecting the flash memory when a first selecting information is supplied thereto, and selecting the electrically erasable nonvolatile memory when a second selecting information is supplied thereto, and a loading unit for supplying the second selecting information to the memory selecting circuit under a condition in which a program voltage is supplied from an external power supply thereto and for loading information in accordance with the loading program stored in the electrically erasable nonvolatile memory selected by the memory selecting circuit.
摘要:
A radio communication system searching method for a portable telephone terminal for selecting, when a plurality of radio communication systems having different carrier frequencies are present in a same area, a suitable one of the radio communication systems. The searching method is improved in that radio communication systems can be searched in order beginning with a radio communication system which is the most advantageous to the user to eliminate the problems of a disorder of company types of radio communication systems and system selection involved in adjacent systems of a same company type. After preferential order numbers of a plurality of radio communication systems are registered into the portable telephone terminal, a home radio communication system of a predetermined frequency with which the portable telephone terminal is under contract is first searched, and then, when the home radio communication system has not been searched out successfully, the remaining radio communication systems are successively searched in accordance with the preferential order numbers registered in advance in the portable telephone terminal.
摘要:
In a first aspect of the invention, when it is expected to disconnect a booster during a call, the station class mark is changed to that applicable when a portable telephone is used as an independent unit in accordance with a key input from the user before the initiation of the call. In a second aspect of the invention, the telephone number of the remote party is stored in a memory during a call. When a connection or disconnection of a booster is detected, the call is terminated, and a redialing operation is automatically performed using the stored telephone number. In a third aspect of the invention, when the connection of a booster is detected during a call, an instruction is given to the booster to operate in a portable telephone mode. In a fourth aspect of the invention, when the connection or disconnection of a booster is detected during a call, a request to change the station class mark is sent to the base station.
摘要:
A first ID code ESN (electronic serial number) for apparatus identification and a second ID code MIN (mobile identification number) such as a telephone number are stored beforehand in a non-volatile memory of a mobile telephone terminal. The mobile telephone terminal transmits these ID codes to a network at the time of communication, and whether or not this set of first and second ID codes has been registered is discriminated on the network side. Communication is allowed if the ID codes have been registered. In order to prevent unlawful use of the mobile telephone terminal in mobile communication, (1) the first ID code is encrypted on the side of a writing device and then inputted to the mobile telephone terminal when the first ID code is written in the non-volatile memory of the mobile telephone terminal, (2) the mobile telephone terminal writes the encrypted first ID code in the non-volatile memory as is, and (3) the encrypted first ID code is decoded at the time of communication and transmitted to the network along with the second ID code.
摘要:
The invention provides a radio communication system searching method for a portable telephone terminal for selecting, when a plurality of radio communication systems having different carrier frequencies are present in a same area, a suitable one of the radio communication systems. The searching method is improved in that radio communication systems can be searched in order beginning with a radio communication system which is the most advantageous to the user to eliminate the problems of a disorder of company types of radio communication systems and system selection involved in adjacent systems of a same company type. After preferential order numbers of a plurality of radio communication systems are registered into the portable telephone terminal, a home radio communication system of a predetermined frequency with which the portable telephone terminal is under contract is first searched, and then, when the home radio communication system has not been searched out successfully, the remaining radio communication systems are successively searched in accordance with the preferential order numbers registered in advance in the portable telephone terminal.
摘要:
When frequencies are being scanned to seize a control channel immediately after the end of a call, if there arises a call request, the call request is stored, and a calling operation is automatically initiated after a control channel has been seized. When a call request is stored, if a predetermined length of time has elapsed before a control channel is seized, the stored call request is discarded.
摘要:
A mobile telephone unit which combines operation of a respective portable mobile telephone and a communication unit. The mobile telephone unit includes at least one portable telephone, a communication unit and a buffer unit. The communication unit includes an external connection terminal, a radio transmitter/receiver, a baseband processor, a communication controller and a handset. The buffer unit mounts at least one portable mobile telephone. The buffer unit includes a first buffer unit connector which is connectable to the external connection terminal of the communication unit, a second buffer connector which connects to a connector of a respective portable mobile telephone mounted on the buffer unit, an identifying mechanism for identifying the communication conditions of a respective portable mobile telephone mounted on the buffer unit, and a control signal transmitting mechanism for transmitting the communication conditions identified by the identifying mechanism to the communication controller of the communication unit. The communication controller is responsive to the transmitted communication conditions and adjusts the communication conditions of the communication unit so that a respective portable mobile telephone mounted on the buffer unit can communicate through the communication unit.
摘要:
In a mobile communication system having two operating systems co-existing in one area, a mobile station having a transmitting and receiving circuit and a control unit for subscribing to one of the two mobile communication systems by selecting a control channel thereof is provided. Accordingly, a normal scan of the control channel of the subscribed-to system is activated, and then an extra scan of the control channel is activated when the control channel is not available during the normal scan. The possibility of an involuntary connection to a non-subscribed-to system is thereby reduced when the mobile station is temporarily in a blind section of the subscribed-to system.
摘要:
A charger for portable terminal equipment, capable of distinguishing a nickel-hydride battery pack and a nickel-cadmium battery pack and of detecting an on-hook/off-hook condition even when the nickel-hydride battery pack is used. The charger includes a charging circuit, a pair of third charging terminals connected to the charging circuit and adapted to be selectively connected to either a pair of first charging terminals of the nickel-hydride battery pack or a pair of second charging terminals of the nickel-cadmium battery pack, and a third auxiliary terminal adapted to be selectively connected to either a first auxiliary terminal of the nickel-hydride battery pack or a second auxiliary terminal of the nickel-cadmium battery pack. The charger further includes a device for comparing a voltage at the third auxiliary terminal with a first reference voltage and detecting the on-hook condition or the off-hook condition of the portable terminal equipment, and a device for comparing the voltage at the third auxiliary terminal with a second reference voltage lower than the first reference voltage and distinguishing the nickel-hydride battery pack and the nickel-cadmium battery pack.
摘要:
A portable radio communication device has an antenna which can be extended for use and retracted for storage, and can transmit a signal at the same level of electric energy when the antenna is stored as when the antenna is extended. When the antenna is retracted and stored, the stored condition is detected by a detecting switch. In response to a detected signal from the detecting switch, a transmission output controller produces an increased transmission output control signal to increase the level of electric energy of the signal to be transmitted which is higher than a normal level of electric energy of signals transmitted from the antenna. When the increased transmission output control signal is generated, a power amplifier amplifies a signal to be transmitted which is supplied from a transmission signal generator, and supplies the amplified signal to the antenna. Therefore, even when the antenna is stored, it can radiate the signal at the same level of electric energy as when the antenna is extended. The antenna comprises an antenna which operates as a loaded antenna when it is extended and as a helical antenna when it is stored.