Modem with received signals and transmitted signals comprising s

Details Modem with received signals and transmitted signals comprising s Modem with received signals and transmitted signals comprising s

1993-06-21

1995-04-11

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375 8, 375122, H04L 2700, H04L 516

Patent

active

054065836

ABSTRACT:
An approach for operating modems in synchronism with the A/D and D/A converters of the network limits the analog signals transmitted to the modem to low levels and concurrently restricts the received signals to large steps. This set of apparently conflicting signal limitations is achieved with a signal conversion process interposed in the communication path between the two hybrids. In one embodiment of this invention, the code conversion is implemented in an adjunct processor that is associated with a switch that participates in the communication path between the two modems. In operation, a call that needs the conversion process is identified by virtue of the calling party's number and service associated service provision information. When it is established that both the calling party's modem and the receiving party's modem operate in the manner that requires signal conversion, conversion is executed. Echo cancellation may be applied to the signal in the code conversion apparatus to further improve performance.

REFERENCES:
patent: 4459655 (1984-07-01), Willemin
patent: 4538262 (1985-08-01), Sinniger et al.
patent: 4706194 (1987-10-01), Webb
patent: 4847832 (1989-07-01), Chang
patent: 4942571 (1990-07-01), Moller et al.
patent: 4988989 (1991-01-01), Goto
patent: 5081586 (1992-01-01), Barthel et al.
"Digital Telephony", second edition, John Bellamy, pp. 38-41, 1991.

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