Title: Method and device for radio transmission of binary data signals

Abstract: A method of eliminating multi-path propagation and time scattering effects on a radio transmitter channel and predominantly a short-wave channel when binary series of 1 and 0 bits are transmitted. Two frequency shift systems are used each having a 1 signal and a 0 signal frequency transmitted during a predetermined part of each bit interval, preferably half an interval. The signal frequencies are received time-selectively within a time slot having a length corresponding to the predetermined part of each bit interval. According to one embodiment a 1 bit is transmitted (received) by transmission (reception) of the 1 signal frequency of the first FSK system during the first half of the bit interval, followed by the 1 signal frequency of the second FSK system while the decision on the transmitted bit is taken on the basis of the superimposed bit information contributions of the two FSK systems. A device for carrying the method into effect is described.

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Inventors: Sjostrand, Jan Roland (Jarfalla, SW)
Zetterberg, Lars Henning (Jarfalla, SW)

Application Number: 521928
Filing Date: 1974-11-07
Publication_date: 1976-04-27
Assignee: U.S. Philips Corporation (New York, NY)
Primary Class(es): 375/267 375/278
Other Classes:
US Patent Ref:

3409875	Nov, 1968	Jager et al.	325/59.
3526837	Sep, 1970	Zegers et al.	325/59.
3842352	Oct, 1974	Cote	325/56.

Other Refs:
Primary Examiner: Safourek, Benedict V.
Assistant Examiner: Hearn, Robert
Attorney: Trifari; Frank R., Cohen; Simon L.