Multiplex communications – Wide area network – Packet switching
Patent
1983-11-09
1985-12-03
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 76, 370124, 358142, H04J 114, H04Q 1104
Patent
active
045569738
ABSTRACT:
A frequency-division multiplex communication method and system in which a data signal is multiplexed with a TV signal in such a manner that interference between the data signal and the video and audio TV signals is substantially eliminated without the need for filters having sharp skirts. A carrier signal, lying in a frequency band assigned to the audio signals, is inserted into the composite TV signal frequency shifted by a predetermined amount relative to the audio component. This carrier signal is FM modulated with a data signal. The modulated data signal is combined with the modulated audio signal for transmission. For receiving, the audio signal band is separated into separate bands. The modulated data signal is separated with the use of an inter-carrier signal between the modulated audio signal and at least one carrier signal from among the separated audio signal inband components. The separated data signal is then FM detected, and subsequently reproduced.
REFERENCES:
patent: 4264925 (1981-04-01), Freeman et al.
patent: 4310854 (1982-01-01), Baer
patent: 4379947 (1983-04-01), Wainer
patent: 4390901 (1983-06-01), Keiser
Kuntz Curtis
Olms Douglas W.
Pioneer Electronic Corp.
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