Radio pager

Details Radio pager Radio pager

1998-06-11

2000-08-08

Le, Thanh Cong

Telecommunications

Transmitter and receiver at separate stations

4551822, 455255, 455257, 455264, H04Q 714

Patent

active

061013692

ABSTRACT:
A radio pager having a frequency correcting function of the present invention includes an arithmetic section for determining, during an interval between the start and the end of a particular signal, a center amplitude based on the maximum and minimum values of the signal, producing a difference between the center amplitude and a reference voltage, and feeding back the resulting center voltage data to a quartz oscillation section or reference oscillation section. As a result, the oscillation frequency of the oscillation section is automatically corrected. This insures an accurate voltage amplitude and therefore accurate decision on a multilevel digital signal.

REFERENCES:
patent: 5109544 (1992-04-01), Mittel et al.
patent: 5263195 (1993-11-01), Panther et al.
patent: 5564091 (1996-10-01), Goldinger
patent: 5612977 (1997-03-01), Ogoro
patent: 5633898 (1997-05-01), Kishigami et al.

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