Alarm communications system with independent supervision signal analysis
First Claim
1. In a communications system comprising a plurality of remote transmitting devices and a receiving station having a receiver associated therewith, each of said remote transmitting devices capable of transmitting a supervision signal and a non-supervision signal, a method for automatically testing the communications system comprising the steps of:
- a) receiving at said receiving station a signal from a transmitting device;
b) processing said received signal at a first sensitivity level and providing a first output signal representative thereof;
c) processing said received signal at a second sensitivity level and providing a second output signal representative thereof, said second sensitivity level being lower in magnitude than said first sensitivity level;
d) determining if said received signal is a supervision signal or a non-supervision signal by analyzing said first output signal;
e) when said received signal is determined to be a supervision signal, then performing the steps of;
i) determining if said second output signal is correlated to said first output signal;
ii) subsequently processing said first output signal as being part of a validly received supervision signal when said second output signal is determined to be correlated to said first output signal; and
iii) not subsequently processing said first output signal as being part of a validly received supervision signal when said second output signal is determined to be uncorrelated to said first output signal; and
f) when said received signal is determined to be a non-supervision signal, then subsequently processing said first output signal as being art of a validly received non-supervision signal.
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Accused Products
Abstract
A self testing wireless data communications system suitable for use with an alarm system, the receiving element of the communications system is capable of receiving the message simultaneously at two different sensitivity levels, and during a supervision message, the lower sensitivity path is used in order to ensure that non-supervision alarm messages are received with an adequate signal margin.
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Citations
13 Claims
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1. In a communications system comprising a plurality of remote transmitting devices and a receiving station having a receiver associated therewith, each of said remote transmitting devices capable of transmitting a supervision signal and a non-supervision signal, a method for automatically testing the communications system comprising the steps of:
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a) receiving at said receiving station a signal from a transmitting device; b) processing said received signal at a first sensitivity level and providing a first output signal representative thereof; c) processing said received signal at a second sensitivity level and providing a second output signal representative thereof, said second sensitivity level being lower in magnitude than said first sensitivity level; d) determining if said received signal is a supervision signal or a non-supervision signal by analyzing said first output signal; e) when said received signal is determined to be a supervision signal, then performing the steps of; i) determining if said second output signal is correlated to said first output signal; ii) subsequently processing said first output signal as being part of a validly received supervision signal when said second output signal is determined to be correlated to said first output signal; and iii) not subsequently processing said first output signal as being part of a validly received supervision signal when said second output signal is determined to be uncorrelated to said first output signal; and f) when said received signal is determined to be a non-supervision signal, then subsequently processing said first output signal as being art of a validly received non-supervision signal. - View Dependent Claims (2, 3, 4, 5)
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6. A self-testing data communications system comprising
a) a plurality of remote devices, each of said remote devices comprising means for transmitting supervision signals and non-supervision signals; b) a receiving station comprising; i) means for receiving said supervision signals and said non-supervision signals; ii) first processing means for providing at a first sensitivity level a first output signal representative of said received signal; iii) second processing means for providing at a second sensitivity level a second output signal representative of said received signal, said second sensitivity level being lower in magnitude than said first sensitivity level; iv) means for determining if said received signal is a supervision signal or a non-supervision signal; and v) means for comparing said first output signal to said second output signal to determine if they are correlated. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A receiving station for use in a data communications system comprising a plurality of remote devices, each of said remote devices having a transmitter for transmitting supervision signals and non-supervision signals, said receiving station comprising:
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a) means for receiving said supervision signals and said non-supervision signals; b) first processing means for providing at a first sensitivity level a first output signal representative of said received signal; c) second processing means for providing at a second sensitivity level a second output signal representative of said received signal, said second sensitivity level being lower in magnitude than said first sensitivity level; d) means for determining if said received signal is a supervision signal or a non-supervision signal; and e) means for comparing said first output signal to said second output signal to determine if they are correlated.
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Specification