Satellite communication system for speech and telegraphy
AssigneeU.S. Philips Corporation
InventorsHermanus H. Grotjohann, John R. Reynders
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Abstract
Satellite communication system for speech signals located within the telephony band and one or more data signals, wherein half-duplex data traffic between ground-based stations can be effected simultaneously with, but separated from, full-duplex speech traffic between two ground-based stations. The use of a second receiver enables all ground-based stations to follow both the data traffic and the speech traffic.
Claims4
A communication system for the transmission on a telephony channel of speech signals located within a speech band as well as at least one data channel comprising data signals modulated on a sub-carrier in a data band which is located outside the speech band, the system comprising at least three stations each station comprising a transmitter and a receiver each operating on one of two mutually different frequencies--which belong to one frequency pair--for half-duplex data communication combined with full-duplex speech communication, characterized in that each station comprises a second receiver having a receive frequency which corresponds to the frequency of the transmitter of that station.
A communication system as claimed in any of the preceding claims, characterized in that the station comprises a data modulator/demodulator coupled to the transmitter and to the receivers and in that the data modulator/demodulator comprises means for keeping the modulator section thereof in the blocked state when the demodulator section is operative.
Dependencies are inferred from the claim text.