Multiplex communications – Wide area network – Packet switching
Patent
1988-10-18
1992-07-07
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 11, H04J 100
Patent
active
051289334
ABSTRACT:
The device comprises an input unit for generating coded data to be transmitted, an FSK coder-modulator for modulating, by frequency shift, the coded data to be transmitted, in a frequency range located between about 15 and 18 KHz, a mixer circuit for superimposing, with an attenuation of 20 to 40 dB, the signals modulated by frequency shift on a low-frequency signal of a traditional program to be applied to a frequency modulation radio transmitter, a decoder comprising filter circuits and an FSK demodulator for separating the coded data from the signals delivered by a standard frequency modulation receiver, and a display or recording unit for displaying or recording the demodulated, filtered, transmitted coded data.
REFERENCES:
patent: 3627949 (1971-12-01), Krecic et al.
patent: 3980954 (1976-09-01), Whyte
patent: 4310854 (1982-01-01), Baer
H. R. Anderson & R. C. Crane, "A Technique for Digital Information Broadcasting Using SCA Channels", IEEE Transactions on Broadcasting, vol. BC-27, No. 4, pp. 65-70.
S. R. Ely, "The Impact of Radio-Data on Broadcast Receivers", The Radio and Electronic Engineer, vol. 52, No. 5, pp. 291-296, Jun. 1982, based on a paper presented at the IERE Conference on Radio Receivers and Associated Systems in Leeds in Jul. 1981.
Kizou H.
Olms Douglas W.
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