US3680047A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Parametric integrator for condition-responsive systems
Assignee: Bosch Security Systems Inc
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Filing: 1970-12-15
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Granted: 1972-07-25
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Expires: 1990-12-15
Abstract
Abstract A parametric integrator adapted for use in condition-responsive systems such as intruder detection devices. The integrator is normally inactive until a transient signal, uncharacteristic of a change in the condition being monitored, is received at the system input. The integrator is then rapidly switched into system circuitry for a predetermined time interval to reduce system sensitivity and thereby avoid the possibility of false alarming in response to the transient.
Inventors
- 👤 David E Perlman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:35
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/18; G08B13/181; G08B13/187
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
87 words
A parametric integrator for suppressing the effect of transient occurrences in a condition-responsive circuit, said integrator comprising in series a high pass filter adapted to pass signals having a substantially higher frequency than the frequency of the condition to be sensed, a normally nonconductive monostable switch adapted to switch to a conducting state for a predetermined time in response to the passage of a signal by said filter, and an RC integrator adapted to be connected to said circuit when said switch is in a conducting state.
Claim 2
Dependent Claim
87 words
A parametric integrator for suppressing the effect of transient occurrences in a condition-responsive circuit, said integrator comprising in series a high pass filter adapted to pass signals having a substantially higher frequency than the frequency of the condition to be sensed, a normally nonconductive monostable switch adapted to switch to a conducting state for a predetermined time in response to the passage of a signal by said filter, and an RC integrator adapted to be connected to said circuit when said switch is in a conducting state.
Claim 3
Dependent Claim
206 words
For use in a photoelectric intruder detection device comprising transmitting means for directing a beam of electromagnetic radiation into a space wherein the intrusion is to be sensed, transducing means positioned to receive radiation from said transmitting means as modified or reflected by objects in said beam for providing an electrical output signal having an amplitude proportional to the intensity of received radiation, signal level sensing means operably coupled with said transducing means output for providing a signal whenever said transducing means output varies with a magnitude and at a rate in excess of a predetermined value, first integrating means, operably coupled with said signal level sensing means output for integrating said sensing means output, and means for activating an alarm whenever the integrated signal exceeds a predetermined threshhold value, the improvement comprising a second integrating meAns having a time constant substantially longer than said first integrating means and being normally disassociated with said device, and means for connecting said second integrating means in parallel with said first integrating means for a predetermined period following a transient signal on the output of said sensing means, said transient signal having a frequency substantially greater than that normally encountered by the passage of an intruder through said beam.
Claim 4
Dependent Claim
206 words
For use in a photoelectric intruder detection device comprising transmitting means for directing a beam of electromagnetic radiation into a space wherein the intrusion is to be sensed, transducing means positioned to receive radiation from said transmitting means as modified or reflected by objects in said beam for providing an electrical output signal having an amplitude proportional to the intensity of received radiation, signal level sensing means operably coupled with said transducing means output for providing a signal whenever said transducing means output varies with a magnitude and at a rate in excess of a predetermined value, first integrating means, operably coupled with said signal level sensing means output for integrating said sensing means output, and means for activating an alarm whenever the integrated signal exceeds a predetermined threshhold value, the improvement comprising a second integrating meAns having a time constant substantially longer than said first integrating means and being normally disassociated with said device, and means for connecting said second integrating means in parallel with said first integrating means for a predetermined period following a transient signal on the output of said sensing means, said transient signal having a frequency substantially greater than that normally encountered by the passage of an intruder through said beam.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |