Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1987-03-18
1989-03-14
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
With particular system function
340500, 340531, 340539, 340536, G08B 2600, H04Q 130
Patent
active
048128201
DESCRIPTION:
BRIEF SUMMARY
This invention relates to an electronic surveillance system and more particularly to an electronic surveillance system wherein serial digital transceiver units placed at separate locations are adapted to communicate with each other. The invention has particular utility in localized security against intruders such as householder's neighbourhood watch security system as has become popular in more recent times, although it will be readily evident that the invention is not limited to this particular application and can be used in many industrial applications such as for monitoring machine functions or cycles.
A neighborhood watch system involves a group of neighbours forming together and taking turns of watching the residence of each other member of the group during periods when a residence is vacant. Such a system has been effective in reducing the incidence of household burglaries but is difficult to co-ordinate and often causes inconvenience in that members have to continually report their movements to the person who is "on-watch".
Furthermore, the task of watching other residences is extremely onerous and sometimes involves the person on watch having to move away from the safety of his or her own residence to observe the vacant house of another member. As well as these disadvantages there are a number of others such as the possibility that another alarm condition like a fire, for example, may not be discovered externally of a residence until it has established a firm hold inside and already caused considerable damage.
As an alternative or adjunct to a neighbourhood watch system there are a number of electronic surveillance systems which are known and available in Australia. Generally such electronic systems include one or more sensors which detect conditions such as intrusion or fire (smoke or heat) and upon detection sound an alarm. The alarm is desired to alert neighbours and/or cause the nervous intruder to panic and thus leave the premises prematurely and without taking any valuables. The electronic systems are of assistance in deterring or distracting would be burglars but in a neighborhood watch system still require householders to advice others when they vacate their home and also perhaps details of how to deactivate the electronic surveillance system.
More sophisticated electronic systems are able to communicate with base stations at remote locations and report alarm conditions such as intrusion or fire but whilst some systems have radio controlled security vehicles mobilized at all times to attend premises where an alarm condition is detected there are often inordinate delays in security vehicles reaching premises and this is a major disadvantage of these systems. Furthermore, the large number of false alarms which occur with sensitive electronic monitoring devices such as infra-red detectors and the like causes a major inefficiency of these "base station" systems.
Accordingly, it is an object of this invention to provide an improved electronic surveillance system which overcomes one or more of the aforementioned problems of existing security systems.
Thus, the invention provides an electronic surveillance system comprising a plurality of transceiver units at spaced locations within the system, characterized in that each said unit is adapted to transmsit digital data in turn, simultaneously to the other units of the system at an exclusive time slot in a cycle of operation, said data identifies the particular unit transmitting data and provides status information, each said unit is further adapted to recognize, at all times, a said transmission from any other unit of the system and also identify a transmission from the immediately preceding unit in said cycle, and perform a said transmission next in turn thereafter, the unit last in said cycle is adapted to transmit coded information such that the first unit in said cycle can identify the end of a cycle and recommence, and each said unit is adapted to respond to the failure of any one unit of the system to transmit said data in turn, or to status i
REFERENCES:
patent: 3909826 (1975-09-01), Schildmeier et al.
patent: 4367458 (1983-01-01), Hackett
patent: 4400694 (1983-08-01), Wong et al.
patent: 4647914 (1987-03-01), Alexander
patent: 4661804 (1987-04-01), Abel
patent: 4673920 (1987-06-01), Ferguson et al.
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