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Monitoring and signalling system including apparatus for processing and analyzing signals produced by activity monitoring sensors

  • US 4,286,331 A
  • Filed: 11/14/1979
  • Issued: 08/25/1981
  • Est. Priority Date: 11/14/1979
  • Status: Expired due to Term
First Claim
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1. In a monitoring and signalling system, apparatus comprising:

  • first sensor means operative to monitor the occurrence of predetermined first and second associated activities and in response to monitoring the occurrence of either associated activity to produce a signal indicative of the occurrence of the activity, said signal including data specifying the particular activity monitored by the first sensor means and identifying the first sensor means;

    second sensor means operative to monitor the occurrence of a predetermined associated activity and in response to monitoring the occurrence of the activity to produce a signal indicative of the occurrence of the activity, said signal including data identifying the second sensor means;

    processing means operative to receive and process signals produced by the first sensor means and the second sensor means, said processing means comprising;

    activity timer means for receiving therein either a first count or a second count;

    analyzing means arranged to analyze the activity and sensor identification data in signals received by the processing means from the first and second sensor means to determine the origin of the signals and the particular monitored activities, said analyzing means being operative for each signal identifying the first sensor means and specifying the occurrence of the first associated activity to cause a first count to be placed in the activity timer means, and operative for each signal identifying the first sensor means and specifying the occurrence of the second associated activity or for each signal identifying the second sensor means to cause a second count to be placed in the activity timer means; and

    means operative if after a first count has been caused to be placed in the activity timer means as a result of the occurrence of the first activity monitored by the first sensor means and before the occurrence of the second activity monitored by the first sensor means the second sensor means monitors the occurrence of its associated activity and produces a corresponding signal to prevent a second count from being placed in the activity timer means to replace the first count caused to be placed therein as a result of the occurrence of the first activity monitored by the first sensor means.

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