System for identifying and correcting the polarity of a data sig

Details System for identifying and correcting the polarity of a data sig System for identifying and correcting the polarity of a data sig

1977-12-23

1979-11-27

Safourek, Benedict V.

Telegraphy

Systems

Alternating or pulsating current

361246, 307262, 307236, H04L 100

Patent

active

041762487

ABSTRACT:
A very low power asymmetrical polarity marking signal which may be the sum of a cosine wave and its coherent second harmonic is added to a symmetrical message signal before transmission. At the receive the polarity information may be recovered from the average dc value of the positive and negative peaks of the polarity signal or from the coincidence of peaks of the fundamental and second harmonic components.

REFERENCES:
patent: 2820181 (1958-01-01), Bowman et al.
patent: 3202762 (1965-08-01), Aaron et al.
patent: 3261919 (1966-07-01), Aaron et al.
patent: 3543050 (1970-11-01), Paine
patent: 3548107 (1970-12-01), Webb
patent: 3751596 (1973-08-01), Tseng
patent: 4051438 (1977-09-01), Pickett et al.

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