Modem

Details Modem Modem

1988-10-07

1990-11-06

Ng, Jin F.

Multiplex communications

Wide area network

Packet switching

375 8, 375 98, H04B 323

Patent

active

049691457

ABSTRACT:
A modem detects the received signal level at the start of communication and inserts an attenuator in the received input circuit if the level is too high. This arrangement extends the dynamic range of the modem without requiring a complex demodulating circuit.

REFERENCES:
patent: 1904567 (1933-04-01), Taylor
patent: 1921063 (1933-08-01), Affel
patent: 3860768 (1975-01-01), Wehrmann
patent: 4029912 (1977-06-01), Geigel et al.
patent: 4064379 (1977-12-01), Horna
patent: 4531234 (1985-07-01), Bell
patent: 4561113 (1985-12-01), Naito
patent: 4764955 (1988-08-01), Galand
patent: 4811423 (1989-03-01), Eastmond

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