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Machine translation
1. (WO1980002338) INTRUSION ALARM SYSTEM
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1980/002338    International Application No.:    PCT/US1980/000412
Publication Date: 30.10.1980 International Filing Date: 15.04.1980
IPC:
G08B 13/16 (2006.01)
Applicants:
Inventors:
Priority Data:
30554 16.04.1979 US
Title (EN) INTRUSION ALARM SYSTEM
(FR) SYSTEME D"ALARME D"INTRUSION
Abstract: front page image
(EN)An ultrasonic intrusion alarm system having a central control unit (10) and a plurality of remote processors (14) connected to the control unit by means of a single cable (12) having two conductors which need not be shielded. All signals necessary for the proper operation of the system flow along the cable (12). The control unit (10) provides a modulated ultrasonic signal (29) and DC power to the remote processors (14) along the cable (12), and each remote processor (14) sends back an alarm along the cable (12) when an intrusion is detected. The signal from each receiving transducer (34) is applied to circuitry (38) in each remote processor (14) which detects the presence of doppler shifted signals representative of a moving object in the protected premises. The control unit (10) includes processing circuitry (46) for detecting signals on the cable (12) which indicate that a remote processor (14) has detected a moving object. The control unit (10) further includes circuitry (20, 22, 24, 26, 28) for applying the modulated signal to the cable in a manner which enhances the reliability and performance of the intrusion alarm system, including a novel switching modulator (24) which is very efficient and wastes little energy.
(FR)Un systeme d"alarme electronique d"intrusion possede une unite de commande centrale (10) et une pluralite de processeurs a distance (14) connectes a l"unite de commande au moyen d"un seul cable (12) ayant deux conducteurs qui n"ont pas besoin d"etre gaines. Tous les signaux necessaires au fonctionnement propre du systeme passent par le cable (12). L"unite de commande (10) envoie un signal ultrasonique module (29) et un courant continu aux processeurs a distance (14) par le cable (12), et chacun des processeurs a distance (14) renvoient une alarme par le cable (12) lorsqu"une intrusion est detectee. Le signal provenant de chaque transducteur de reception (34) est applique a un systeme de circuits (38) de chaque processeur a distance (14) qui detecte la presence de signaux decales Doppler representatifs d"un objet mobile dans les locaux proteges. L"unite de commande (10) comprend un systeme de circuits de traitement (46) de detection de signaux sur le cable (12) qui indiquent qu"un processeur a distance (14) a detecte un objet mobile. L"unite de commande (10) comprend en outre un systeme de circuits (20, 22, 24, 26, 28) d"application du signal module au cable d"une maniere qui ameliore la fiabilite et le fonctionnement du systeme d"alarme d"intrusion, qui comprend en outre un nouveau modulateur de commutation (24) tres efficace et consommant peu de courant.
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)