Receiver for local calls with low energy consumption

Details Receiver for local calls with low energy consumption Receiver for local calls with low energy consumption

1993-05-17

1995-10-31

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

34082521, 3701054, 375368, G08B 522

Patent

active

054633834

ABSTRACT:
A local call receiver or pager includes a circuit (3) for receiving and demodulating a call signal emitted by a central station and which contains synchronization code words, address code words and message code words. The circuit is connected to the pager energy source (16) through a switching circuit (3b) for cutting off the energy supply when it is not necessary to receive the call signal. The pager also includes a decoder (4) intended to control the switching circuit as a function of the analysis of the call signal synchronization code words. The analysis is effected bit-by-bit and the receiver circuit is disconnected as soon as the synchronization code word is recognized, in most cases following analysis of only a few bits of the code word. Application is in respect of pagers in which a satisfactory compromise must be obtained between dimensions and autonomy, as for instance in pagers combined with a timepiece to be worn on the wrist.

REFERENCES:
patent: 4768032 (1988-08-01), Sharpe et al.
patent: 4837854 (1989-06-01), Oyagi et al.
patent: 4857915 (1989-08-01), Andros et al.
patent: 4996526 (1991-02-01), DeLuca
patent: 5001471 (1991-03-01), Snowden et al.
patent: 5049875 (1991-09-01), DeLuca et al.
patent: 5144296 (1992-09-01), DeLuca et al.
patent: 5252963 (1993-10-01), Snowden et al.
patent: 5325088 (1994-06-01), Willard et al.

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