Alarm transmission system
First Claim
1. An alarm transmission system, comprising a plurality of removable and portable autonomous detection units distributed in a space divided into zones, each unit equipped with detectors capable, when activated of generating electrical signals;
- transmission means in each detection unit for transmitting the signals generated by said detectors, said transmission means comprising means for coding and radio-transmitting binary information which is frequency modulated on a carrier frequency; and
means for permanently maintaining a strict phase relationship between the carrier frequency and the binary information signal transmitted by the transmission means;
a plurality of autonomous portable receiving modules for receiving the signal transmitted by said detection units, each said receiving module being equipped with radio-receiving and decoding means as well as signalling or warning means capable of being activated upon receipt of the signals sent by the detection units and a central information-receiving and processing unit equipped with at least one such receiving module.
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Accused Products
Abstract
An alarm transmission system with portable receivers for watching a site, which system comprises a plurality of portable and removable autonomous detection units, a plurality of portable autonomous receiving modules capable of releasing signalling or warning means incorporated to the said receiving modules upon receipt of signals sent by a transmission unit and a central information-receiving and processing unit equipped with at least one receiving module, and in which system the signal transmission unit is constituted on the one hand by radio-transmission and coding means associated to each detection unit and on the other hand by means of reception by radio-link and decoding means incorporated to each portable receiving module.
41 Citations
13 Claims
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1. An alarm transmission system, comprising a plurality of removable and portable autonomous detection units distributed in a space divided into zones, each unit equipped with detectors capable, when activated of generating electrical signals;
- transmission means in each detection unit for transmitting the signals generated by said detectors, said transmission means comprising means for coding and radio-transmitting binary information which is frequency modulated on a carrier frequency; and
means for permanently maintaining a strict phase relationship between the carrier frequency and the binary information signal transmitted by the transmission means;
a plurality of autonomous portable receiving modules for receiving the signal transmitted by said detection units, each said receiving module being equipped with radio-receiving and decoding means as well as signalling or warning means capable of being activated upon receipt of the signals sent by the detection units and a central information-receiving and processing unit equipped with at least one such receiving module. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
- transmission means in each detection unit for transmitting the signals generated by said detectors, said transmission means comprising means for coding and radio-transmitting binary information which is frequency modulated on a carrier frequency; and
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2. An alarm transmission system comprising:
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(a) a set of portable autonomous detection units distributed in a space divided into zones, said units having detectors capable of generating electrical signals upon being activated; (b) transmission means in each detection unit for transmitting the signals generated by said detectors, said transmission means comprising means for coding and means for radio-transmitting binary information corresponding to said signals in frequency modulated form on a carrier frequency; (c) a plurality of autonomous portable receiving modules remote from said detection units for receiving the signals transmitted by detection units, each receiving module comprising; (i) means for receiving said transmitted information; (ii) means for decoding said transmitted information; and (iii) signalling or warning means which may be activated upon receipt of said transmitted information; and (d) a central information-receiving and processing unit equipped with at least one said receiving module, said receiving modules capable of being temporarily plugged into said central information-receiving and processing unit for direct interaction therewith.
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Specification