Pulse or digital communications – Receivers
Patent
1997-04-14
1998-10-27
Chin, Stephen
Pulse or digital communications
Receivers
375365, 375354, 455343, H03K 900, H04L 700, H04B 116
Patent
active
058287043
ABSTRACT:
In a radio selective calling receiver, a receiving unit extracts a digital signal from a radio signal received through an antenna. A frame synchronization signal detector frame-synchronizes the digital signal output from the receiving unit and outputs a state signal representing a frame synchronization state as one of a pull-in state and a pull-out state. A timer resets a timer value to start a timer operation when the state signal from the synchronization signal detector represents a change from the pull-in state to the pull-out state, and stops the timer operation to output a timer value when the state signal from the synchronization signal detector represents a change from the pull-out state to the pull-in state. A first memory sequentially stores a plurality of timer values from the timer. A second memory stores a reference value calculated on the basis of an average value of the timer values stored in the first memory. A third memory stores in advance data necessary for the radio selective calling receiver. A controller compares a timer value of the timer under operation with the reference value stored in the second memory and resets receiver data using the data stored in the third memory when a comparison result represents a coincidence.
REFERENCES:
patent: 5606742 (1997-02-01), Kido
patent: 5636243 (1997-06-01), Tanaka
Chin Stephen
NEC Corporation
Tran Khai
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