Method and device for transmitting pulse-duration modulated sign

Details Method and device for transmitting pulse-duration modulated sign Method and device for transmitting pulse-duration modulated sign

1978-05-11

1979-12-18

Griffin, Robert L.

325142, 325164, H04B 104

Patent

active

041796608

ABSTRACT:
A method of, and device for transmitting a pulse-duration modulated signal wherein information is contained in the position of pulse edges in the signal comprising, amplitude modulating a first carrier oscillation with the pulse duration modulated signal to form a first carrier frequency pulse train wherein the pulse duration does not always correspond to an integral number of carrier oscillation periods, and amplitude modulating a second carrier oscillation with the pulse duration modulated signal in phase opposition to the modulation of the first carrier oscillation to form a second carrier frequency pulse train wherein the pulse duration does not always correspond to an integral number of carrier oscillation periods, the start of the first and second carrier oscillations by the pulse duration modulated signal being in phase with each other, and the end of one of the first and second carrier oscillations being separated from the start of the other of the first and second carrier oscillations to prevent a distortion of one of the first and second carrier oscillations by the other of the first and second carrier oscillations.

REFERENCES:
patent: 3622885 (1971-11-01), Kruszynski
patent: 3683278 (1972-08-01), Ohnsorge
patent: 3939419 (1976-02-01), Lindner
patent: 3959586 (1976-05-01), Blomenkamp
patent: 4037173 (1977-07-01), Toman

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