Digital data transmission device for a composite transmission si

Details Digital data transmission device for a composite transmission si Digital data transmission device for a composite transmission si

1990-08-10

1992-06-23

Ton, Dang

Multiplex communications

Wide area network

Packet switching

375 17, 371 56, H04J 114

Patent

active

051249790

ABSTRACT:
In a digital data transmission device for transmitting a composite transmission signal comprising a main data signal represented by parallel n bits and a subdata signal, a multilevel encoding unit encodes upper and lower levels of m bits in the main data signal into first and second encoded signals. A first signal converter converts the first and the second encoded signals and an uncoded signal of (n-m) bits in the main data signal to a first converted signal. An inverter inverts the first encoded signal to an inverted signal. A second signal converter converts the inverted signal, the second encoded signal, and the uncoded signal to a second converted signal. A selection unit selects a selected signal from the first and the second converted signals in response to the subdata signal and produces the selected signal as the composite transmission signal. A digital data reception device receives as a reception signal the composite transmission signal produced by the digital data transmission device and comprises a processing unit for processing the reception signal to produce a processed signal and a reproducing unit. Supplied with the processed signal, the reproducing unit reproduces the main data signal and the subdata signal as a reproduced main data signal and a reproduced subdata signal.

REFERENCES:
patent: 4410911 (1983-10-01), Field et al.
patent: 4682334 (1987-07-01), Le Mouel et al.
patent: 4993046 (1991-02-01), Saito et al.

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