Multi-alert radio paging system

Details Multi-alert radio paging system Multi-alert radio paging system

1991-12-12

1994-02-15

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

340825480, G08B 522

Patent

active

052870995

ABSTRACT:
A multi-alert paging receiver of this invention includes a decoder. The decoder constitutes ON durations of alert signals corresponding to the plurality of addresses by using combinations of at least two tones having different frequencies including a specific frequency.

REFERENCES:
patent: 4145684 (1979-03-01), Stodolski
patent: 4181893 (1980-01-01), Ehmke
patent: 4403212 (1983-09-01), Masaki
patent: 4431990 (1984-02-01), Wycoff et al.
patent: 4449040 (1984-05-01), Matsuoka et al.
patent: 4462030 (1984-07-01), Ishii
patent: 4537108 (1985-08-01), Shiramizu
patent: 4563680 (1986-01-01), Nakajima
patent: 4704608 (1987-11-01), Sato et al.
patent: 4818987 (0489-04-01), Ide et al.

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