Telecommunications – Transmitter and receiver at separate stations – Single message via plural carrier wave transmission
Patent
1988-03-16
1990-06-05
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at separate stations
Single message via plural carrier wave transmission
455 78, H04B 144
Patent
active
049320718
ABSTRACT:
A device and system for preventing channel blockage on aircraft voice communication frequencies caused either by the pilot beginning a transmission while someone else is transmitting on the same channel or by a stuck microphone condition. The device includes an arrangement so that one does not interrupt other transmitters having the same device. The present device enforces a reciprocity by use of a subaudible tone which is transmitted. If the tone is detected, the device will not interrupt such a transmission. However, if someone else is not transmitting the subaudible tone, the device can ignore their transmission and operate as though the particule radio channel is available for use. An anti-blocking switch extends between the push-to-talk line as connected to the transceiver and the push-to-talk switch. The single anti-blocking switch may be used to inhibit transmission corresponding to a particular channel being occupied and corresponding to a stuck microphone. A circuit is used to detect activation of the push-to-talk switch twice within a given time period and uses that information to close the anti-blocking switch and allow transmission even on an occupied channel. An audio tone and/or a light is provided to the pilot or other radio operator to indicate that a radio transmission is being inhibited. Present radios may be considered as having transmitter priority, a radio using anti-blocking circuitry will have receiver priority.
REFERENCES:
patent: 4305154 (1981-12-01), Deman et al.
patent: 4366578 (1982-12-01), Foster et al.
patent: 4494244 (1985-01-01), Arndt et al.
patent: 4549309 (1985-10-01), Corrigan
patent: 4551854 (1985-11-01), Rutty et al.
patent: 4573215 (1986-02-01), Oates et al.
Arndt Alfred
Rutty John G.
Eisenzopf Reinhard J.
Kuntz Curtis A.
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