Multi-alert radio paging system

Communications: electrical – Continuously variable indicating – With meter reading

Patent

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Details

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.

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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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