Telecommunications – Transmitter and receiver at separate stations – With control signal
Patent
1989-09-25
1991-12-31
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at separate stations
With control signal
455 70, 455 92, 455114, 34082531, 34082572, H04B 104, H04Q 302
Patent
active
050778315
ABSTRACT:
A safeguard device having a transmitter produces a high-fequency signal modulated with a code signal word and a receiver having an alarm device is controlled thereby. To protect the transmitter from unauthorized use and to achieve an expansion of its utility, a switching device is provided having a memory for storing a code word and an input unit for a password. The switching device includes a comparing device and code signal generator. The comparing device enables the transmitter when an input password matches with a stored code word. The code signal generator selectively produces either an alarm or a reset code signal word to modulate a high-frequency signal. When the transmitter is switched to the active transmitting state, the appropriately modulated high-frequency signal is emitted. At the receiver, the alarm device is either activated or switched off depending on the code signal word received.
REFERENCES:
patent: 4247850 (1981-01-01), Marcus
patent: 4463340 (1984-07-01), Adkins et al.
patent: 4529980 (1985-07-01), Liotine et al.
patent: 4786900 (1988-11-01), Karasawa et al.
patent: 4878052 (1989-10-01), Schulze
Search Report of the Federal Republic of Germany Patent Office for Application 38 32 667.1, filed 9/27/1988, Report dated 2/16/89.
Eisenzopf Reinhard J.
Pham Chi H.
Telefunken electronic GmbH
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