| 摘要 |
This pager includes a circuit (3) for receiving and demodulating a paging signal transmitted by a central station and containing synchronisation codewords, address codewords and message codewords. This circuit is connected up to the supply (16) of the pager by way of switching means (3b) for cutting it off from this supply when it is not necessary to receive the paging signal. The pager also includes a decoder (4) intended for controlling the switching means based on analysing the synchronisation codewords of the paging signal. This analysis is done bit by bit and the receiver circuit is cut off once the synchronisation codeword has been recognised, usually after analysing just a few bits of the codeword. Application to pagers in which a good compromise between size and autonomy is to be effected, such as, for example, in pagers combined with a timepiece which is to be worn on the wrist. <IMAGE> |
