Telegraphy – Systems – Printing
Patent
1974-11-07
1976-04-27
Safourek, Benedict V.
Telegraphy
Systems
Printing
325320, 178 66R, H02B 100
Patent
active
039537986
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.
REFERENCES:
patent: 3409875 (1968-11-01), Jager et al.
patent: 3526837 (1970-09-01), Zegers et al.
patent: 3842352 (1974-10-01), Cote
Sjostrand Jan Roland
Zetterberg Lars Henning
Cohen Simon L.
Hearn Robert
Safourek Benedict V.
Trifari Frank R.
U.S. Philips Corporation
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