Composite type crime preventive sensor

• US 4,942,384 A
• Filed: 03/31/1989
• Issued: 07/17/1990
• Est. Priority Date: 04/08/1988
• Status: Expired due to Term

• Current Assignee: Matsushita Electric Works Ltd (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Works Ltd (Panasonic Holdings Corporation)
• Inventors: Yamauchi, Kazumasa, Katayama, Susumu
• Primary Examiner(s): Orsino, Joseph A.
• Assistant Examiner(s): MULLEN, THOMAS J
• Application Number:
  US07/331,367
• Time in Patent Office: 473 Days
• Field of Search: 340/541, 340/567, 340/554, 340/522, 340/508, 342/27-28, 367/93-94
• US Class Current: 340/522
• CPC Class Codes: G08B 13/1645 using ultrasonic detection means and other detection means, e.g. microwave or infrared radiation

Abstract

A composite type crime preventive sensor processes output detection signals from a plurality of sensor units of mutually different detection systems for ranking the signals into a plurality of grades depending on signal level, and provides an intruder detection signal when a sum of ranked level values is above a preset reference value, whereby any risk of alarm failing and erroneous alarming can be effectively minimized.

Claims

1. A composite type crime preventive sensor comprising:

a plurality of sensor units respectively of different detecting systems and employed in combination with one another, means for processing output detecting signals from said sensor units, said means for processing output detection signals including means for correlating each of said output detection signals from the respective sensor units with a corresponding one of a plurality of grades depending on signal level to provide a ranked level value for each of said output detection signals, and means for providing as an output an intruder discrimination signal when a sum of the ranked level values is above a preset reference value, wherein said preset reference value is set to be larger than the largest ranked level of said ranked level values.

2. A composite type crime preventing sensor according to claim 1, wherein said preset reference value is set to be larger than the largest ranked level value of said ranked level values.

3. A composite type crime preventive sensor comprising:

a plurality of sensor units respectively of different detecting systems and employed in combination with one another, means for processing output detection signals from said sensor units, said means for processing output detection signals including means for correlating each of said output detection signals from the respective sensor units with a corresponding one of a plurality of grades depending on signal level to provide a ranked level value for each of said output detection signals, and means for providing as an output an intruder discrimination signal when a sum of the ranked level values is above a preset reference value, wherein for at least one of said plurality of sensor units the largest ranked level value of said ranked level values when achieved is maintained for a fixed period.

4. A composite type crime preventive sensor comprising:

a plurality of sensor units respectively of different detecting systems and employed in combination with one another, means for processing output detection signals from said sensor units, said means for processing output detection signals including means for correlating each of said output detection signals from the respective sensor units with a corresponding one of a plurality of grades depending on signal level to provide a ranked level value for each of said output detection signals, and means for providing as an output an intruder discrimination signal when a sum of the ranked level values is above a preset reference value, wherein said means for correlating each of said output detection signals has a plurality of threshold values to be used for the output detection signal level ranking, and the ranked level value being assigned to an output detection signal corresponds to one of said plurality of threshold values which the output detection signal exceeds for a predetermined time period.

5. A composite type crime preventive sensor according to claim 4, wherein for at least one of said plurality of sensor units the largest ranked level value of said ranked level values when achieved is maintained for a fixed time period.

6. A composite type crime preventive sensor comprising:

a plurality of sensor units respectively of different detecting systems and employed in combination with one another, means for processing output detection signals from said sensor units, said means for processing output detection signals including means for correlating each of said output detection signals from the respective sensor units with a corresponding one of a plurality of grades depending on signal level to provide a ranked level value for each of said output detection signals, and means for providing as an output an intruder discrimination signal when a sum of the ranked level values is above a preset reference value, wherein said means for correlating each of said output detection signals has at least a threshold value for the detection signal level ranking, the ranked level value being raised by one grade when the signal level exceeds the threshold value within a predetermined time period but lowered by one grade when the signal level does not exceed the threshold value within the predetermined time period.

7. A composite type crime preventive sensor comprising:

a plurality of sensor units respectively of different detecting systems and employed in combination with one another, means for processing output detection signals from said sensor units, said means for processing output detection signals including means for correlating each of said output detection signals from the respective sensor units with a corresponding one of a plurality of grades depending on signal level to provide a ranked level value for each of said output detection signals, means for providing as an output an intruder discrimination signal when a sum of the ranked level values is above a preset reference value, and an abnormality discrimination means connected to at least one of said plurality of sensor units for selectively allowing a determination of whether said intruder discrimination signal is to be output on the basis of the output detection signal of each sensor unit other than the output detection signal of at least one of the sensor units, with said preset reference value set to be below the largest ranked level value of said ranked level values.