Selective call receiver with battery saving features and method

Details Selective call receiver with battery saving features and method Selective call receiver with battery saving features and method

1993-01-25

1995-01-10

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

455 383, 455343, H04Q 700

Patent

active

053811330

ABSTRACT:
A selective call receiver (200) includes a receiver (204) receiving paging signals including a preamble, a synchronization codeword, and at least address information. A controller (206) controlling a supply of power to the receiver for receiving the paging signals. A synchronization obtaining circuitry (404, 406, 224), coupled to the receiver (204), obtains synchronization to the paging signal. The synchronization obtaining circuitry (404, 406, 224) includes a baud rate detector and synchronization codeword detector, coupled to the baud rate detector, detects the synchronization codeword. An address decoder, responsive to the synchronization codeword being detected, decodes the address information. A synchronization maintaining circuitry (404, 408, 224) maintains synchronization to the paging signals during address decoding. The synchronization maintaining circuitry (404, 408, 224) includes circuitry for enabling the power switch (210) which enables the receiver (204) for receiving the paging signals. The baud rate detector (224), responsive to the power being supplied to the receiver (204), detects baud rate during at least first (150) and second (152) portions of the address. A preamble detector (404), responsive to the second portion of the address being received, detects preamble during at least a portion of a second address (152).

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