Patent US3874971A successfully refreshed from Google Patents.
Patent US3761910A successfully refreshed from Google Patents.
US3761910A
Expired / Lapsed
US
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Detector of motion in a scanned field
Assignee: QUALITY ENGINEERING ASSOCIATES
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Filing: 1972-03-02
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Granted: 1973-09-25
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Expires: 1992-03-02
Abstract
Abstract A circuit for use with a scanning device, such as a television camera, detects motion in the area viewed by the scanning device. The circuit detects changes in the levels of one or more of the harmonics of the scanning frequency in the output of the scanning device. When such a change is detected an alarm is triggered.
Inventors
- 👤 J Vidovic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:42
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/18; G08B13/189; G08B13/194; G08B13/196; G08B13/19602; G08B13/19634
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
112 words
Apparatus for detecting motion in an area which comprises: a. a scanning device for producing a signal having a characteristic sweep frequency at its output; b. a harmonic detector coupled to the output of said scanning device for detecting the level of at least one harmonic of said sweep frequency; c. an integrator connected to the output of said harmonic detector for obtaining an average value of said output; and d. a differentiator connected to the output of said integrator for detecting a change in the output of said integrator whereby a signal at the output of said differentiator will correspond to motion in the area under surveillance by said scanning device.
Claim 2
Dependent Claim
112 words
Apparatus for detecting motion in an area which comprises: a. a scanning device for producing a signal having a characteristic sweep frequency at its output; b. a harmonic detector coupled to the output of said scanning device for detecting the level of at least one harmonic of said sweep frequency; c. an integrator connected to the output of said harmonic detector for obtaining an average value of said output; and d. a differentiator connected to the output of said integrator for detecting a change in the output of said integrator whereby a signal at the output of said differentiator will correspond to motion in the area under surveillance by said scanning device.
Claim 3
Dependent Claim
14 words
The apparatus of claim 1 in which said scanning device is a television camera.
Claim 4
Dependent Claim
17 words
The apparatus of claim 1 in which said differentiator has a longer time constant than said integrator.
Claim 5
Dependent Claim
17 words
The apparatus of claim 2 in which said integrator has a time constant of over 33 milliseconds.
Claim 6
Dependent Claim
28 words
The apparatus of claim 1 which additionally has an indicator means for indicating if there is or has been a signal at the output of said differentiator .
Claim 7
Dependent Claim
14 words
The apparatus of claim 5 in which said indicator means includes a flip-flop circuit.
Claim 8
Dependent Claim
18 words
The apparatus of claim 5 in which said indicator means is responsive to either positive or negative pulses.
Claim 9
Dependent Claim
22 words
The apparatus of claim 1 in which said harmonic detector detects the level of at least two harmonics of said sweep frequency.
Claim 10
Dependent Claim
51 words
The apparatus of claim 2 in which said television camera has a composite video output and in which there is additionally a video processor which connects to said composite video output of said camera, said processor having means for reducing the sync level of a video signal from said television camera.
Claim 11
Dependent Claim
28 words
The apparaTus of claim 9 in which said differentiator has a longer time constant than said integrator and said integrator has a time constant of over 33 milliseconds.
Claim 12
Dependent Claim
27 words
The apparatus of claim 10 which additionally has an indicator means for indicating if there is or has been a signal at the output of said differentiator.
Claim 13
Dependent Claim
22 words
The apparatus of claim 11 in which said harmonic detector detects the level of at least two harmonics of said sweep frequency.
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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |