Demodulation of auxiliary low frequency channels in digital tran

Details Demodulation of auxiliary low frequency channels in digital tran Demodulation of auxiliary low frequency channels in digital tran

1986-05-19

1987-12-29

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

455214, H04J 312, H04B 116

Patent

active

047165634

ABSTRACT:
An arrangement for the demodulation of auxiliary low frequency channels in digital transmission systems comprising means (12) for receiving the transmitted signals, linear amplification means (13) with automatic gain control (AGC) (14) for the received signals, non linear discrimination means (15) for discriminating between logic levels in the amplified digital signals at the main channel bit rate, and subtraction means (16) for subtracting the output of the discrimination means from the amplified signals to obtain the auxiliary low frequency channel signals.

REFERENCES:
patent: 3666889 (1972-05-01), Zegers et al.
patent: 4156848 (1979-05-01), Stimple et al.
patent: 4627077 (1986-12-01), Armstrong

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