Abstract: A radio tele-communication apparatus of this invention is arranged as follows. A receiving circuit receives a signal including transmission information transmitted from a base station and outputs a demodulated signal. A determining circuit determines whether or not self-addressed transmission information is included in the demodulated signal output from the receiving circuit. If the determining circuit determines that the self-addressed transmission information is included in the demodulated signal, a detecting circuit compares the currently received transmission information with previously received transmission information to detect a change amount therebetween. If the change amount is larger than a predetermined amount, an informing circuit informs reception of the self-addressed transmission information. The informing circuit also contains various informing states which can be adjustably set by the user.

Abstract: A paging apparatus with a time information generating circuit comprises a combination switch having multiple switch positions in different operation directions, so that a time setting mode is set when a predetermined first operation is performed by the combination switch, and a paging mode is set other operations are performed. When a predetermined second operation is performed with the time setting mode set, time information measured by the time information generating circuit is replaced with time information input by the second operation. Even in the time setting mode, it is checked if a call is made to the apparatus. When there is such a call, a user is informed of this event without ignoring the occurrence of the call.

Abstract: A tele-communication device includes a memory for storing a plurality of pieces of messages transmitted over a communication channel and a display device for displaying the message information read from the memory in response to an operation of a display switch. The pieces of message information are automatically read from the memory in sequence at regular intervals and displayed on the display device while the display switch is depressed continuously. When the display time of a message exceeds a given time, the message is automatically erased from the display. When the display switch is depressed within a given time from when the message is erased automatically, the erased message is displayed again.

Abstract: A paging apparatus having a battery saving function comprises a power supply to a radio circuit and a power supply control circuit. Power is turned on periodically in synchronization with the detection of synchronization signals and is turned off responsive to the detection of a predetermined sequence. The power supply to the radio circuit remains turned off without being turned on periodically for a predetermined time period in response to the detection of a specific code addressed to the paging apparatus.

Abstract: A paging apparatus with a time information generating circuit comprises a combination switch having multiple switch positions in different operation directions, so that a time setting mode is set when a predetermined first operation is performed by the combination switch, and a paging mode is set other operations are performed. When a predetermined second operation is performed with the time setting mode set, time information measured by the time information generating circuit is replaced with time information input by the second operation. Even in the time setting mode, it is checked if a call is made to the apparatus. When there is such a call, a user is informed of this event without ignoring the occurrence of the call.

Abstract: A radio tele-communication apparatus of this invention is arranged as follows. A receiving circuit receives a signal including transmission information transmitted from a base station and outputs a demodulated signal. A determining circuit determines whether or not self-addressed transmission information is included in the demodulated signal output from the receiving circuit. If the determining circuit determines that the self-addressed transmission information is included in the demodulated signal, a detecting circuit compares the currently received transmission information with previously received transmission information to detect a change amount therebetween. If the change amount is larger than a predetermined amount, an informing circuit informs reception of the self-addressed transmission information.

Abstract: A method and apparatus of this invention changes a frequency at which a control circuit (signal processing circuit) operates in accordance with an operational load of a circuit. More specifically, a pager comprises a signal processing circuit for detecting a first signal sequence within received signals by comparing the received signals with codes originated in the pager and for identifying a second signal sequence received in association with the first signal sequence within the received signals, the signal processing circuit being supplied with a first clock signal having a first frequency when the signal processing circuit detects the first signal sequence and being supplied with a second clock signal having a second frequency when the signal processing circuit identifies the second signal sequence. Still, the frequency applied to the signal processing circuit may be changed in accordance with the operational load of the circuit.

Abstract: A paging apparatus comprises a control device for controlling all other components of the apparatus. The control device can have a memory for storing the ID number of the paging apparatus. There is shown methods and devices for storing the ID number in the memory or an ID memory device. These methods can be classified into two types. One type is write, into the memory of the control device or into the ID memory device, the ID number which the apparatus detects after a specific code and which has been broadcast from a base station, along with the specific code. The other type is to write the ID number into the memory of the control device or into the ID memory device when the input terminal provided the paging apparatus is connected to an external ID number writer. In either type of method, the paging apparatus generates an alarm upon completion of writing the ID number into the memory of the control device or into the ID memory device, thereby informing the user of this fact.

Abstract: A paging apparatus includes a first switch for turning on/off a power supply, a second switch, a memory for storing a received message, a display for displaying a message read out from the memory, a switch operation detector for detecting operations for the first and second switches, and a message controller for selectively executing a display mode of displaying the message, a preservation mode of preserving the message in the memory, and a clear mode of clearing the message stored in the memory, in response to a conbination of operations of the first and second switches detected by the switch operation detector.

Abstract: A selective calling receiver with automatic memory storage and turn-on indication is disclosed. When the receiver is placed in the called state by an incoming signal, audible and/or visual indicator signals actuated by the incoming signal are automatically stopped after a predetermined period of time has elapsed and record of the called state is simultaneously kept in a memory integral to the receiver. Indication of the called state is regenerable at a later time by a switching operation. Indication of the called state is stoppable without recording such indication in memory when a manual reset operation is performed before indication of the called state is automatically stopped.

Abstract: What is disclosed is a system for recovering encoded data from a transmitted signal. A clock regenerating circuit regenerates a clock signal from the data bits encoded in the signal. The regenerated clock signal is used to synchronize an up/down with each individual data bit. When a data bit is at a logic "H", the counter counts from a predetermined value in an upward direction and when the data bit is at a logic "L", the counter counts in a downward direction from a predetermined value. The count after each bit-time is used to provide a signal representative of the logic state of that data bit. Accordingly, a reproduced data signal can be accurately obtained.

Abstract: Two limit voltages are established for a wireless telephone apparatus. If the power supply voltage exceeds the first limit voltage, the transmitter of the wireless telephone apparatus is prevented from radiating signals. At the same time, the central processing unit of the wireless telephone apparatus shelters, in a dedicated shelter register, the control data necessary to carry on communication once power is restored, and an inhibit circuit prevents the central processing unit from writing into the read-write memory. If the power supply voltage exceeds the second limit voltage, the central processing unit is disabled from exercising control of the apparatus. When the power supply voltage returns within the second limit voltage, the central processing unit is enabled to exercise control over the apparatus. When the power supply voltage returns within the first limit voltage, the transmitter is enabled to radiate signals and the central processing unit reestablishes communication using the sheltered data.