Abstract: A selective call receiving apparatus with a display for receiving and displaying its own selective call number and message information attached to it, displaying time while waiting for a call to be received and displaying the message information added with a receiving time. The selective call receiving apparatus with a display comprises a comparing unit for comparing the message information with preset individual message information and for producing a coincidence signal when both items of information have coincided, a clock time setting unit which operates based on the coincidence signal from the comparing unit, and a display unit for displaying an output from the clock time setting unit.

Abstract: A receiver with an individual selective call function includes a ROM for storing an individual selection number in which a secret number of the receiver is registered. A data control unit compares a secret number registered in its own memory and the secret number registered in the individual selection number ROM of the receiver, and when they are not equal, the read/write operation of the individual selection number ROM is disabled.

Abstract: A selective calling receiver enabling a user to know exactly whether the receiver used by the user is placed within an area where a transmitted radio wave can be received well. The selective calling receiver collates a frame synchronization signal in the transmitted signal at predetermined intervals and as far as the collation is successful, the synchronization is kept and the receiver is operated in an intermittent reception mode. When the collation is not successful, an alarm is issued after a predetermined time to inform the user that the receiver has been placed outside of the area where the transmitted radio wave can be received well.

Abstract: An individual selective-calling receiver is disclosed which includes a switch, a first timer for generating an output signal in a case where the switch is put in an ON-state for a time longer than a first predetermined time, a second timer started by the output signal of the first timer for generating an output signal at intervals of a second predetermined time, and a receiving-frequency selection circuit (for example, a PLL) for selecting one of a plurality of receiving frequencies, and in which the receiving-frequency selection circuit commences a frequency selecting operation on the basis of the output signal of the first timer. The receiving frequencies are successively selected in accordance with the output signal of the second timer, and the frequency selecting operation of the receiving-frequency selection circuit is stopped when the switch is again put in the ON-state, to maintain a selected receiving frequency.

Abstract: There is provided a battery voltage alarm apparatus which announces the necessity of battery exchange when battery voltage falls below a predetermined level. The battery voltage alarm apparatus has a battery voltage detector, and a plurality of steps of detection levels for raising battery low voltage alarm are set and alarm sounds generated at individual levels are made to be different from each other. An alarm raised at a higher level is made to be an intermittent singing or a low-volume singing in order to reduce power consumption.

Abstract: A selective call radio paging receiver having a display function for use in mobile communications and the like. Various apparatus functions are performed by two switches. A memory is responsive to closure of a first switch to receive and store message information succeeding an assigned paging code signal. A display is responsive to closure of a second switch to display message information stored in the memory. A controller controls the memory and the display and detects actuation of the second switch for a time duration exceeding a predetermined time period to enable erasure of the message information stored in the memory.

Abstract: A selective call receiving apparatus including a memory. When a new message is to be stored in the memory of which all memory regions have message information stored, the message information for the selective calling number of the lowest priority level of those assigned previously to the all the selective calling numbers, respectively, is erased to thereby allow the incoming message information of less value to be erased earlier.

Abstract: There is provided a battery voltage alarm apparatus which announces the necessity of battery exchange when battery voltage falls below a predetermined level. The battery voltage alarm apparatus has a battery voltage detector, and a plurality of steps of detection levels for raising battery low voltage alarm are set and alarm sounds generated at individual levels are made to be different from each other. An alarm raised at a higher level is made to be an intermittent singing or a low-volume singing in order to reduce power consumption.