Low-frequency supplementary information transmitting...

Details Low-frequency supplementary information transmitting... Low-frequency supplementary information transmitting...

H - Electricity

04

L

340/75

H04L 25/49 (2006.01) H04J 3/12 (2006.01)

Patent

CA 1137581

ABSTRACT OF THE DISCLOSURE: A supplementary information transmitting arrangement for a digital data transmission system in which the supplementary information is a low-frequency wave modulated or not modulated. There is provided means for modulating the ?high? level parity of the incoming digital data signal by the low-frequency wave and means for restoring the low-frequency wave from the outgoing resulting digital signal from said modulating means. The incoming digital signal can be binary or ternary coded and, if binary coded, be scrambled. The modulating of the ?high? level parity is performed, in dependence on the period or phase of the low-frequency wave, by inserting a predetermined word or by modifying a ternary word when the incoming binary slgnal is scrambled and converted in ternary code.

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