US3680074A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Intrusion systems employing digital processing circuitry
Assignee: Individual
•
Filing: 1969-11-03
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Granted: 1972-07-25
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Expires: 1989-11-03
Abstract
Abstract A plurality of Doppler systems are utilized to monitor a plurality of locations against intrusions by radiating energy covering the volume enclosed by said location and providing a Doppler frequency shift for the presence of an intruder. Each of said Doppler signals if present are impressed upon a carrier frequency and transmitted for propagated along a common path to a monitor location. A plurality of detector circuits at the monitor location each respond to one of said carrier frequencies to provide an output signal representative of said Doppler frequency generated by said one location. A gating circuit has a plurality of input terminals each coupled to one of said detector circuits to provide an output signal between first and second levels having a repetition rate determined by said Doppler frequency. A first timing circuit is caused to initiate a time delay upon activation thereof by said first voltage level from said gate and resets upon receipt of said second voltage level. A second timing circuit commmences a larger time delay on receipt of said second voltage level from said gate and if not reset by said first circuit indicates that the receipt of said transmitted signal along said path was in fact a true Doppler frequency. The processing circuit including the first and second timing circuits further includes alarm activating means and a plurality of location gates to indicate to a security guard both the presence of a true Doppler frequency and, therefore an intrusion, and the locations at which the intrusion is taking place.
Inventors
- 👤 Zeev Lieser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:46
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/50; G01S13/52; G01S13/56
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
147 words
A detection system for detecting the presence of an intruder at any one of a plurality of locations, said detection system comprising: a. a plurality of Doppler systems, each having a radiation field for covering one of said plurality of locations for providing a given Doppler output signal in response to movement of an intruder in that location; b. a control circuit coupled to each of said Doppler systems, said control system adapted to produce an alarm signal in response to reception of a given Doppler output signal from any of said Doppler systems; and c. a plurality of locator circuits, each responsive to an alarm signal by said control circuit and to a given Doppler output signal from a different one of said Doppler systems, each of said locator circuits responsive to said alarm and given Doppler output signals to produce an intruder location indicating output.
Claim 2
Dependent Claim
147 words
A detection system for detecting the presence of an intruder at any one of a plurality of locations, said detection system comprising: a. a plurality of Doppler systems, each having a radiation field for covering one of said plurality of locations for providing a given Doppler output signal in response to movement of an intruder in that location; b. a control circuit coupled to each of said Doppler systems, said control system adapted to produce an alarm signal in response to reception of a given Doppler output signal from any of said Doppler systems; and c. a plurality of locator circuits, each responsive to an alarm signal by said control circuit and to a given Doppler output signal from a different one of said Doppler systems, each of said locator circuits responsive to said alarm and given Doppler output signals to produce an intruder location indicating output.
Claim 3
Dependent Claim
104 words
A detection system according to claim 1 wherein said control circuit comprises gating means having a plurality of inputs each receiving said given Doppler output signal from a different one of said Doppler systems and for producing a single output in response to reception of a Doppler output from any of said Doppler systems; and each of said locator circuits comprises a location gate having a first input responsive to the occurrence of said alarm signal, a second input responsive to the given Doppler output signal from a different one of said Doppler systems, and an output for providing said location indicating output signal.
Claim 4
Independent Claim
184 words
A system for monitoring the continuity of signal pulses comprising: a. a signal source means for producing signal pulses having transitions between first and second voltage levels; b. a first timing circuit means coupled to said source means and adapted to commence timing periods of a given duration in resPonse to pulse transitions to said first voltage level, and to be reset by said signal pulse transitions to said second voltage level; c. a second timing circuit means coupled to said source means and adapted to commence timing periods of particular duration larger than said given duration in response to initial occurrences of signal pulse transitions between said first and second voltage levels; d. reset circuit means coupled between said first and second timing circuit means and adapted to reset said second timing circuit means interrupting said timing periods of particular duration in response to each completion by said first timing circuit of a timing period of said given duration; and e. output means activated by said second timing circuit means in response to completion thereby of said timing period of said particular duration.
Claim 5
Independent Claim
184 words
A system for monitoring the continuity of signal pulses comprising: a. a signal source means for producing signal pulses having transitions between first and second voltage levels; b. a first timing circuit means coupled to said source means and adapted to commence timing periods of a given duration in resPonse to pulse transitions to said first voltage level, and to be reset by said signal pulse transitions to said second voltage level; c. a second timing circuit means coupled to said source means and adapted to commence timing periods of particular duration larger than said given duration in response to initial occurrences of signal pulse transitions between said first and second voltage levels; d. reset circuit means coupled between said first and second timing circuit means and adapted to reset said second timing circuit means interrupting said timing periods of particular duration in response to each completion by said first timing circuit of a timing period of said given duration; and e. output means activated by said second timing circuit means in response to completion thereby of said timing period of said particular duration.
Claim 6
Dependent Claim
34 words
A system according to claim 3 wherein said second timing circuit means commences said timing periods of particular duration in response to initial signal pulse transitiOns from said first to said second voltage level.
Claim 7
Dependent Claim
29 words
A system according to claim 3 wherein said signal source comprises a condition responsive means for producing said signal pulses in response to the occurrence of a given condition.
Claim 8
Dependent Claim
33 words
A system according to claim 5 wherein said output means comprises an alarm means activated by said second timing circuit in response to completion thereby of said timing period of said particular duration.
Claim 9
Dependent Claim
26 words
A system according to claim 6 wherein said condition responsive means comprises a Doppler system for detecting movements of an intruder in an area under surveillance.
Claim 10
Dependent Claim
113 words
A system according to claim 5 wherein said condition responsive means comprises a plurality of condition responsive detectors each producing detection pulses in response to the occurrence of a different given condition and including combining means for producing said pulse transitions in response to reception of pulses from any of said condition responsive detectors, and a plurality of locator circuits each responsive to activation of said output means and to signal pulses from a different one of said condition responsive detectors, each of said locator circuits responsive to the activation of said output means and to signal pulses from said one of said condition responsive detectors to produce an intruder location indicating output.
Claim 11
Dependent Claim
118 words
A system according to claim 8 wherein said combining means comprises gating means having a plurality of inputs each receiving said signal pulses from a different one of said detectors and producing in response thereto said signal pulses having said transitions between said first and second voltage levels; and each of said locator circuits comprise a location gate each having a first input coupled to a separate input of said gating means and a second input coupled to the output of said second timing circuit means and responsive to completion thereby of a timing period of said particular duration to provide at the outputs of said gates a signal indicating which of said detectors produced the activating pulses.
Claim 12
Dependent Claim
33 words
A system according to claim 8 wherein said output means comprises an alarm means activated by said second timing circuit in response to completion thereby of said timing period of said particular duration.
Claim 13
Dependent Claim
28 words
A system according to claim 10 wherein each of said detectors comprises a Doppler system disposed to detect movements of an intruder in a different area under surveillance.
Claim 14
Dependent Claim
34 words
A system according to claim 11 wherein said second timing circuit means commences said timing periods of particular duration in response to initial signal pulse transitions from said first to said second voltage level.
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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 |