Communications: electrical – Condition responsive indicating system – With particular coupling link
Reexamination Certificate
1999-11-22
2002-03-19
Crosland, Donnie L. (Department: 2636)
Communications: electrical
Condition responsive indicating system
With particular coupling link
C340S539230, C340S566000, C367S197000
Reexamination Certificate
active
06359558
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention is directed in general to security systems and in particular, to a wireless security system in which a peripheral device, which operates with a receiver, is capable of transmitting coded signals relaying an audible alarm to the receiver. The transmitter transmits the coded signals using a different data frame pattern during each transmission.
2. Background Information
Transmitter-receiver controller systems are widely used for remote control and/or actuation of devices or appliances such as garage door openers, gate openers, and security systems. For example, most conventional security systems use a transmitter-receiver combination to monitor selected areas. In such conventional security systems, all the peripheral devices such as sensors, and the control unit operate using the same identification code, so that only those devices belonging to a particular installed security system on the premises can operate with each other. Other devices which operate using a different identification code, would be ignored. In more complicated systems, various groups of peripheral devices may be assigned to different zones, each of which is monitored for quick identification in the event of a security breach.
Such conventional security systems create security risks. Since a single, fixed identification code is utilized, the identification code transmitted by a peripheral device may be detected by a hostile user, and subsequently used to disarm the control unit. Further, a single, fixed identification code may be generated by a non-system source and incorrectly recognized as a system signal.
A security system that uses the present inventive signaling system may have a need for non-system alarm devices that are not equipped to transmit the required signals. These non-system alarm devices may provide only an audible signal.
Accordingly, there is a need in the technology for a security system which provides increased security by having peripheral devices, each having different identification codes which cannot be easily detected. In addition, there is a need for a security system which improves immunity to spurious signals by transmitting a different data frame pattern during each transmission. Further, there is a need for a security system that can include non-system alarm devices by detecting an audible alarm signal and provide the benefits of the secure identification codes and changing transmissions. Still further, there is a need for a circuit for detecting an audible alarm signal that can be battery powered and having a long battery life to allow the circuit to be placed in the vicinity of the audible alarm without requiring a hard-wired power supply or frequent battery maintenance.
SUMMARY OF THE INVENTION
An alarm relay device including a microphone that produces a signal responsive to an audible alarm having a frequency. A first circuit coupled to the microphone produces a first detect signal when the signal is above a predetermined level. A second circuit coupled to the microphone and the first circuit receives power responsive to the first detect signal. The second circuit produces a second detect signal when the signal is within a predetermined range of the frequency.
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