Method and apparatus for detecting a hazard detector signal in the presence of interference
First Claim
1. An apparatus for detecting a pattern warning signal from a hazard detector in the presence of a second pattern warning signal from a second hazard detector, comprising:
- a transducer for converting the pattern warning signal and the second pattern warning signal to a composite electronic signal, each of the first and second pattern warning signals comprising an on-time period followed by an off-time period;
an analog-to-digital converter for converting the composite electronic signal into a digital signal;
a memory for storing processor-executable instructions and one or more thresholds;
a transmitter for transmitting an alarm signal; and
a processor coupled to the analog-to-digital converter, the memory and the transmitter for executing the processor-executable instructions that causes the apparatus to;
determine an on-time duration of the digital signal as a time that the digital signal exceeded a first voltage threshold stored in the memory; and
transmit an alarm signal to a receiver when the pattern warning signal has been determined to be present, based on the on-time duration.
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Accused Products
Abstract
The present disclosure describes methods and apparatus for detecting a pattern warning signal from a hazard detector in the presence of a second pattern warning signal from a second hazard detector. In one embodiment, hazard detector monitoring device converts a pattern warning signal and a second pattern warning signal into a composite electronic signal, each of the first and second pattern warning signals comprising an on-time period followed by an off-time period. Next, the composite electronic signal is converted into a digital signal and then an on-time duration of the digital signal is determined as a time that the digital signal exceeded a first voltage threshold. Finally, an alarm signal is transmitted to a receiver when the pattern warning signal has been determined to be present, based on the on-time duration.
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Citations
12 Claims
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1. An apparatus for detecting a pattern warning signal from a hazard detector in the presence of a second pattern warning signal from a second hazard detector, comprising:
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a transducer for converting the pattern warning signal and the second pattern warning signal to a composite electronic signal, each of the first and second pattern warning signals comprising an on-time period followed by an off-time period; an analog-to-digital converter for converting the composite electronic signal into a digital signal; a memory for storing processor-executable instructions and one or more thresholds; a transmitter for transmitting an alarm signal; and a processor coupled to the analog-to-digital converter, the memory and the transmitter for executing the processor-executable instructions that causes the apparatus to; determine an on-time duration of the digital signal as a time that the digital signal exceeded a first voltage threshold stored in the memory; and transmit an alarm signal to a receiver when the pattern warning signal has been determined to be present, based on the on-time duration. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for detecting a pattern warning signal from a hazard detector in the presence of a second pattern warning signal from a second hazard detector, comprising:
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converting the pattern warning signal and the second pattern warning signal into a composite electronic signal, each of the first and second pattern warning signals comprising an on-time period followed by an off-time period; converting the composite electronic signal into a digital signal; determining an on-time duration of the digital signal as a time that the digital signal exceeded a first voltage threshold; transmitting an alarm signal to a receiver when the pattern warning signal has been determined to be present, based on the on-time duration. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification