Security alarm device

Details Security alarm device Security alarm device

2004-02-25

2008-11-25

Nguyen, Hung T. (Department: 2612)

Communications: electrical

Condition responsive indicating system

With particular coupling link

C340S539100, C340S539150, C340S539210, C340S539230, C340S506000, C340S517000, C340S571000

Reexamination Certificate

active

07456734

ABSTRACT:
The device is designed for warning about relocation of objects under control relative to the controlling user. The engineering effect is achieved through the ability to carry out control and identification of several objects at a time and to generate preliminary warning about possible loss of contact with objects under control. The device uses a pseudo-noise signal and makes it possible to differentiate between signals within the same bandwidth and the same time interval through the form-wise selection. i.e. the device solves the problem of carrier guidance in terms of frequency, virtually eliminating the cross-talk and interference with other radio systems and provides ample opportunities for increase in the number of simultaneously controlled (guarded) objects by means of, for example, modifications in the structure of a pseudo-random sequence for pseudo-noise signal generation.

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patent: 4952939 (1990-08-01), Seed
patent: 6122312 (2000-09-01), Shiro
patent: 6909095 (2005-06-01), Tran et al.
patent: 7023341 (2006-04-01), Stilp
patent: 7170404 (2007-01-01), Albert et al.

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