Method of analyzing a monitoring signal from a sensing system to determine an alarm condition

A method of analyzing a monitoring signal from a sensing system where the monitoring signal varies over time to determine an alarm condition,

• the sensing system being located in an environment including ambient conditions and operating during a plurality of different time periods;
• the method comprising:
• providing the monitoring signal as a stream of digital values;
• analyzing the stream of digital values using a frequency-based or time-based algorithm to generate a plot of elements obtained from the analysis;
• comparing a plurality of the elements of the stream with a reference signal and triggering the alarm condition in the event that a difference from the reference is exceeded;
• and changing the reference signal in different time periods in response to ambient conditions of the environment determined for those time periods.

A method of analyzing a monitoring signal from a sensing system where the monitoring signal varies over time to determine an alarm condition,

• the sensing system being located in an environment including ambient conditions and operating during a plurality of different time periods;
• the method comprising:
• providing the monitoring signal as a stream of digital values;
• analyzing the stream of digital values using a time-based algorithm to generate a plot of elements obtained from the analysis;
• applying a delta additively or multiplicatively to each element of the plot of elements to adjust sensitivity thereof to provide a threshold;
• comparing a plurality of the elements of the stream with the threshold and triggering the alarm condition in the event that the threshold is exceeded;
• and changing the time-based algorithm in different time periods in response to ambient conditions of the environment determined for those time periods.