Abstract: A radio signal selective-calling receiver includes a detector which detects a difference in frequency between a first base clock signal of the radio signal selective-calling receiver and a second base clock signal of a base station, based on third signals transmitted from the base station. The base station is in communication with the radio signal selective-calling receiver through a communication line. The radio signal selective-calling receiver also includes a compensator which compensates for the first base clock signal with respect to a frequency in accordance with the detected difference, and transmits a base clock signal having been compensated for, and a signal transmitter which transmits a synchronization clock signal on the basis of the base clock signal having been compensated for by the compensator.

Abstract: A radio selective calling receiver which can prevent reliably a radio section from being affected by a noise generated in a boosting circuit during an infrared-ray communication, whereby a reception sensitivity in the radio section can be prevented from being degraded. The radio selective calling receiver has a memory 14 for storing reception information received by the radio section 2 and an infrared-ray data communication section 24 for outputting the reception information stored in the memory 14 to an external terminal by means of an infrared ray and for receiving infrared-ray data from the external data terminal so as to cause a first control means 4 to control the infrared-ray data communication of the infrared-ray data communication section 24 if telecommunication dispatching is inputted and to cause a second control means 10 to inhibit the infrared-ray data communication during an operation of the radio section 2 even if the telecommunication dispatching is inputted.

Abstract: A radio pager includes a waveshaper for shaping a baseband signal recovered from a demodulated variable format paging signal into a binary signal. A/D conversion and symbol decision circuitry provides conversion of the baseband signal into a multi-bit signal representing one of predefined discrete levels. A format detector responds to the binary signal from the waveshaper for producing a first output indicating that a two-level signal is forthcoming or a second output indicating that a more-than-two-level signal is forthcoming. The binary signal is supplied to a decoder in response to the first output of the format detector, and the multi-bit signal is supplied to the decoder in response to the second output of the detector. A power saving circuit is responsive to the first output of the format detector for inactivating the A/D conversion and symbol decision circuitry and responsive to the second output for activating that circuitry.