Apparatus and method for processing a received signal being improper to the specification in a paging receiver

PURPOSE: A device for processing a non-standard receiving signal of a radio paging receiver is provided to change a battery saving signal period when a signal including preamble data is received. CONSTITUTION: A frequency oscillator(190) oscillates a pre-determined frequency. A delay circuit(192) delays the oscillating frequency. An XOR(Exclusive OR Gate)(194) performs an XOR operation for an oscillating frequency applied to the first input and an oscillating frequency which is applied to the second input and delayed by the delay circuit(192), and outputs the oscillating frequencies. A decoder(120) decides whether a paging signal including preamble data is received. If so, the decoder(120) responds to an output of the XOR(194), and changes on/off periods of a battery saving signal to output the changed periods to a switch. Simultaneously, the decoder(120) outputs the changed periods to the second input of an OR else circuit.