Multiplex communications – Wide area network – Packet switching
Patent
1990-05-16
1992-06-30
Safourek, Benedict V.
Multiplex communications
Wide area network
Packet switching
370 12, 375 46, 375 79, H04J 1400
Patent
active
051269988
ABSTRACT:
A method and apparatus for transmitting and receiving a carrier signal which is simultaneously frequency and phase modulated, including a carrier signal, a frequency modulator for imposing on the carrier signal an analog information signal, a bi-phase shift key modulator for modulating the frequency modulated carrier with a digital information signal to provide an output frequency and phase modulated carrier signal, a receiving system including a multiplier by which the received composite signal is multiplied by two to cancel out the bi-phase modulation and thereby derive a frequency modulated only signal, demodulating the multiplied frequency modulated signal utilizing a frequency demodulation network and comparing the derived frequency modulated signal with the received transmitted signal to derive the digital information signal.
REFERENCES:
patent: 3737578 (1973-06-01), Matsuo
patent: 4255810 (1981-03-01), Solomon et al.
patent: 4654864 (1987-03-01), Ichiyoshi
patent: 4677608 (1987-06-01), Forsberg
Hom Shick
Safourek Benedict V.
U.V. Satellite Resources, Inc.
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