Improved page party system

Details Improved page party system Improved page party system

1991-07-30

1993-01-12

Schreyer, Stafford D.

Telephonic communications

Private or single line system

With paging

379171, 379172, 379173, 455 46, 455 47, H04M 902, H04B 302, H04B 350

Patent

active

051795884

ABSTRACT:
A page party system for use in industrial environments, having a plurality of stations joined by a page line and by a single party line for providing multiple full-duplex conference calls over the single party line. Multiple full-duplex conferencing is achieved by combining single sideband suppressed carrier amplitude modulation and frequency division multiplexing.

REFERENCES:
patent: 5014347 (1991-05-01), Cox et al.
patent: 5033080 (1991-07-01), Deone

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