Nec Corporation

Motoki Ide

Toshifumi Sato

Yasuyuki Mochizuki

Hiroaki Shibayama

Takashi Oyagi

Kazuo Morita

Kazunobu Yamada

A radio communication device enables a message received to be displayed by flexible format. The selective-calling receiver as a receiver comprises a radio section for demodulating the selective-calling signal with it received, a calling number storage section for storing therein a plurality of self-selective-calling numbers, an agreement detector for detecting whether or not demodulated selective-calling signal agrees with which one of the plurality of self-selective-calling signal, a memory for storing therein a plurality of calling separation information for separating whether message information following to self-selective-calling number and selective-calling number agreeing to be detected agree with which one of the plurality of self-selective-calling numbers, a indicator for displaying the message information, and a display measure for permitting message information within the memory to display on the indicator, wherein the display measure permits the message information to display on the indicator in accordance with prescribed display format determined beforehand in every selective-calling number.

Radio communication device with flexible indicating function

A radio paging receiver receives a paging signal including at least a paging number signal and a message signal which follows the paging number signal. The receiver detects a paging signal which is intended therefor, by comparing the received paging number signal with a pre-stored paging number signal. Upon detection of the intended paging signal, the receiver searches the received message signal for a specific message signal which satisfies a condition that is pre-stored in a RAM of the receiver. If the receiver finds a message signal satisfying the pre-stored condition, it displays the message signal and/or enables at least one of a speaker, an LED indicator and a vibrator according to notification information that is also pre-stored in the RAM. The message searching condition and the notification information are pre-stored in the RAM through a keyboard coupled to the receiver.

Paging receiver with a message selection circuit

A synchronization controller identifies the timing of the group assigned to the receiver based on a synchronization signal detected by a preamble and synchronization signal detector. At this timing the power supply of a radio section is turned on. A selective calling number within the received group and pre-assigned selective calling number are compared in a selective calling number detector. The power supply of the radio section is immediately turned off, if the result of the comparison is non-coincidence. In this way, the battery saving efficiency can be enhanced by arranging to turn on the radio section only in the groups which are assigned to the receiver, and turning off immediately the power supply of the radio section when the receivers assigned selective calling number is not found in the receiver's assigned group.

Method and apparatus for controlling power supplied to a receiver based

A selective calling receiver having an alarting time auto-control function according to the present invention includes a first storing circuit for storing an identification number. A decoder for detecting a coincidence of a call signal contained in the received signal and the identification number, and for outputting a coincidence signal, and for decoding a message signal contained in the received signal, and for outputting a message. An alarting section for inputting the coincidence signal and alarting. A display section for displaying the message. A second storing circuit for storing an none-read message and a read out message. A reset switch for being operated by a user when he notices the alerting, and for outputting a reset signal. A calculating circuit for calculating an alerting time based on the number of the non-read messages. A counting circuit for counting the alerting time, and for outputting a count up signal when the alerting time is counted up. An alerting stopping circuit for inputting the reset signal or the count up signal, and making the alerting and displaying stop. A rewrite circuit for outputting the message as an non-read message upon receiving the count up signal to the second memory, and for outputting the message as a read out message upon receiving the reset signal to the second memory means.

Selective calling receiver having an alerting time auto-control function

A selective calling receiver operated by causing a processor to execute a prestored program includes a non-writable mask ROM prestoring the program, a patch register for storing a patch address, a programmable patch memory for storing a patch program, a comparator for detecting a coincidence between a value of the patch register and an instruction code fetch address, and a patch control circuit for controlling the microprocessor so as to execute the patch program in the patch memory.

Selective calling receiver

A radio selective calling receiver with a display function receives a call thereto upon reception of a numerical signal including a message, reads out a fixed or arbitrary standardized expression of standardized expressions stored in advance which is designated by the numerical signal, and displays the readout standardized expression. The receiver includes a registration section and a read selection section. The registration section registers the readout arbitrary standardized expression, as a protective message, in an EEPROM upon adding management information to the standardized expression. The read selection section selects whether to read out and display a protective message having management information added thereto of contents registered by the registration section, or read out and display information other than the management information.

Selective calling receiver with display function and fixed and arbitrary

In selecting at least one of plural informing mechanisms as a selected informing mechanism, a waveform symbol is displayed on an LCD representing the selected informing mechanism. The waveform symbol expresses the sound pattern for indicating reception of a call signal.

Pictorial display apparatus for receivers for implementing the pictorial

A radio selective calling receiver including an exchangeable first battery and a second battery which can be charged by the first battery. A CPU stops operating at a stop voltage. A RAM stores a user data. A stop detector detects operational stop of the CPU. A power supply changer changes one of the first and second batteries into the other and selectively supplies one of electric energies of the batteries to the CPU, RAM and stop detector. The minimum operable voltages of the RAM and the stop detector are lower than the stop voltage. The first battery supplies its electric energy to the CPU, RAM and stop detector until the supply voltage of the first battery lowers to the stop voltage. The power supply changer changes the first battery into the second battery when the operational stop of the CPU is detected, so that the second battery supplies its electric energy to the CPU, RAM and stop detector until the first battery thus lowered in supply voltage is exchanged by a new one. The capacity of the first battery can be effectively used without any malfunction of the receiver and no troublesome reinput action is required for the user.

Selective-calling receiver with battery switching upon CPU stop detection

In a radio communication apparatus having both portable telephone portion and radio paging portion, the portable telephone portion comprises a portable telephone transmission/reception unit 21, a control unit 23, a speech transceiver 25, a display unit 27, and an operation unit 29, while the radio paging portion comprises a radio paging receiver unit 31, the control unit 23, the display unit 27, the operation unit 29, a tone generation announcement unit 33, a silent announcement unit 35, an announcement mode memory 39, and a reception information memory 37. It is assumed that the operation unit 29 selects 'a delayed announcement mode after completion of communication' and stores this mode in the announcement mode memory 39. In this event, when the radio paging operation is received during communication of the portable telephone portion, the control unit 23 makes the silent announcement unit 35 carry out call announcement in a silent mode and makes the reception information memory 37 memorize a message. After completion of the communication, the control unit 23 makes the tone generation announcement unit 33 announce reception of the radio paging operation during communication and makes the display unit 27 collectively display the reception information.

Radio communication apparatus capable of carrying out radio paging

In a selectively called radio receiver in which a demodulated signal of a specific bit rate is produced with battery saving kept in synchronism with the demodulated signal, a bit rate detecting unit detects the bit rate with a controllable sensitivity while the synchronism is lost. A bit rate detecting control arrangement controls the sensitivity within a predetermined sensitivity range. The bit rate detecting unit may misdetect the bit rate with a variable misdetection rate which is accumulated to an incremented amount from an initial amount representative of no misdetection while the synchronism is lost. The bit rate detection control arrangement may decrement the misdetection rate to the initial amount when the incremented amount reaches a predetermined amount. Alternatively, the bit rate detection control arrangement may control the misdetection rate between a greater and a smaller amount and then cause the misdetection rate to return to the initial amount. In either event, the bit rate detection control arrangement controls the sensitivity within a predetermined range.

Selectively called radio receiver in which bit rate detection is

In a paging receiver having a processing unit (15) which produces an incoming message in response to reception of a radio signal specifically directed to the receiver, the processing unit compares the incoming message with each of selected messages selected from particular messages which are memorized in a message memory (18). Only when the incoming message is not coincident with at least one of the selected messages, the processing unit produces an activating signal. In accordance with the activating signal, the processing unit stores the incoming messages as one of the particular messages in the message memory. When the incoming message is coincident with at least one of the selected messages, the incoming message is not stored in the message memory. Preferably, when one of the selected messages is memorized in the message memory continuously in excess of a predetermined time period while the incoming message is coincident with the one of the selected messages, the processing unit renews the one of the selected messages.

Paging receiver capable of rapidly judging necessity of keeping an

A pager receiver is assigned to a particular call number and is for receiving pager signals of a predetermined baud rate by use of the battery saving technique. Each of the pager signal comprises a synchronization code signal and a plurality of address signals, each of the address signals comprising a call number and a message, a particular one of the address signals being assigned to the pager receiver. The pager receiver is driven by a power-on signal at a timing for receiving the particular address signal. The pager receiver has a baud rate monitoring circuit for detecting the predetermined baud rate of a signal received to produce a monitoring signal, and a comparing circuit for comparing the call number in the particular address signal with the particular call number to produce a coincident signal. When both of the monitoring signal and the coincident signal are present at a time, the pager receiver drives an indicator.

Pager receiver for enabling to omit power-on signal for receiving

A selective calling receiver includes a decoder having a reference clock oscillator and a CPU having a CPU operating clock oscillator. The decoder includes a timing control circuit for generating a timing signal in synchronism with a synchronizing signal contained in a POCSAG signal and a BCH error correcting circuit for extracting a message code from the POCSAG signal. If the CPU is supplied with a message code from the decoder when no timing signal is inputted from the decoder, the CPU stores the message code in RAM in the CPU or a buffer memory area of external RAM connected to the CPU. In this case, the CPU operates with a first clock signal generated by the reference clock oscillator. When the CPU is supplied with the timing signal from the decoder, the CPU reads the message code from the RAM or the buffer memory area and processes the message code with a second clock signal generated by the CPU operating clock oscillator and the second clock signal has a frequency higher than the frequency of the first clock signal.

Selective calling receiver with multiple clock frequencies for receiving

In a radio paging receiver comprising a receiving section (11), a decoder section (12), and a CPU (13) for distinguishing a specific one of a plurality of call signals and processing a specific message signal succeeding the specific call signal into a processed message signal, the receiving section is intermittently put into operation. The decoder section is put into operation in accordance with a first clock signal which is supplied from a first clock generator (16). A switching circuit (20) selectively connects the CPU with the first clock generator and a second clock generator (17). More particularly, the CPU is put into operation in accordance with a second clock signal which is supplied from the second generator when the receiving section does not operate. The frequency of the second clock signal is much higher than that of the first clock signal. Therefore, the CPU processes the specific message signal into the processed message signal at a rapid processing speed in accordance with the second clock signal when the receiving section is not put into operation.

Radio receiver with clock signal controlled to improve the signal to

A power source control apparatus for use in electronic equipment of the type including a microprocessor and a main power source in the form of a battery controls a boosting circuit which boosts the output voltage of the battery to produce an operating voltage of the equipment. Connected in parallel to the battery are the boosting circuit and a power switch for producing a power ON/OFF signal. A reset/set flip-flop is connected between the boosting circuit and the power switch. The boosting circuit is operable only when the output of the flip-flop has a set state. Even when the power ON/OFF signal becomes a low level, i.e., OFF state, the flip-flop maintains its output in a set state until a power control signal is fed thereto from the external equipment. The period of time for which the operating power should be held after the turn-off of the power switch can be freely determined to suit the external equipment. Further, a reset signal generating circuit is provided for producing a predetermined reset signal depending upon the state of the flip-flop output.

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Tokyo, Japan

Motoki Ide