Simultaneous transmission of two information signals within a ba

Details Simultaneous transmission of two information signals within a ba Simultaneous transmission of two information signals within a ba

1982-01-08

1984-01-10

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 11, 370 19, 370119, 375 48, H04J 1500, H04J 1100

Patent

active

044256426

ABSTRACT:
A co-channel communications system is disclosed which permits a digital data signal to be simultaneously transmitted with a communications medium signal such as telephone voice or television video. The data signal or signals are converted into very low multifrequency signals consisting of fundamental frequencies and harmonics which span the communications bandwidth. Because a number of frequencies are used for each data signal, the signal level of the data signals can be greatly suppressed relative to the communications medium signal to a level such that there is no perceptible degradation of the telephone voice or television video. Synchronous detectors for each frequency transmitted, including harmonic frequencies, are utilized to recapture and regenerate the data signals transmitted.

REFERENCES:
patent: 3377625 (1968-04-01), Filipowsky
patent: 3810019 (1974-05-01), Miller
patent: 3875339 (1975-04-01), Gruen et al.
patent: 4238849 (1980-12-01), Gassmann

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