Frequency multiplexed full duplex 4800 BPS modem

Details Frequency multiplexed full duplex 4800 BPS modem Frequency multiplexed full duplex 4800 BPS modem

1990-01-29

1991-08-06

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375 8, H04L 512

Patent

active

050383663

ABSTRACT:
4800 B/S full duplex operation of a frequency-multiplexing modem over the switched telephone network without cancellation is made possible by combining 900-baud, 32-state operation with a combination of analog filtering and raised cosine digital filtering and stop bit robbing.

REFERENCES:
patent: 4417349 (1983-11-01), Hills et al.
patent: 4731800 (1988-03-01), Motley et al.
patent: 4747096 (1988-05-01), Piasecki et al.
patent: 4747114 (1988-05-01), Martinez
patent: 4748640 (1988-05-01), Staley et al.

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