Patent US3614724A successfully refreshed from Google Patents.
US3614724A
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Detection system
Assignee: United States Atomic Energy Commission
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Filing: 1970-04-08
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Granted: 1971-10-19
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Expires: 1990-04-08
Abstract
Abstract A detection system which utilizes an automatically varied threshold controlled by noise level in one or more frequency bands while monitoring a plurality of seismic frequency bands where signal and noise do not occur simultaneously. The signal and noise frequency bands may be preselected or they may be automatically determined during operation of the system.
Inventors
- 👤 William L Brown
- 👤 John M Portlock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:22
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/16; G08B13/1654; G08B13/1663; G08B13/22; Y; Y10; Y10S; Y10S367/00; Y10S367/901
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
138 words
A detection system comprising means for generating an electrical signal responsive to seismic disturbances, variable gain amplifier means coupled to said generating means for amplifying said electrical signal, band-pass filter means coupled to said amplifying means for passing a portion of said amplified electrical signal within a first frequency band, additional filter means coupled to said amplifying means for passing a different portion of said amplified electrical signal having frequencies outside said first frequency band, means coupled to said amplifying means for varying the gain thereof in response to the amplitude of said frequencies from said additional filter means, and means for sensing the amplitude of signals in said first frequency band and for producing an information signal when said amplitude is above a predetermined amplitude relative to the amplitude of the frequencies from said additional filter means.
Claim 2
Dependent Claim
138 words
A detection system comprising means for generating an electrical signal responsive to seismic disturbances, variable gain amplifier means coupled to said generating means for amplifying said electrical signal, band-pass filter means coupled to said amplifying means for passing a portion of said amplified electrical signal within a first frequency band, additional filter means coupled to said amplifying means for passing a different portion of said amplified electrical signal having frequencies outside said first frequency band, means coupled to said amplifying means for varying the gain thereof in response to the amplitude of said frequencies from said additional filter means, and means for sensing the amplitude of signals in said first frequency band and for producing an information signal when said amplitude is above a predetermined amplitude relative to the amplitude of the frequencies from said additional filter means.
Claim 3
Dependent Claim
32 words
The system of claim 1 wherein said additional filter means includes a plurality of band-pass filter means coupled to said amplifying means for passing different frequency portions of said amplified electrical signal.
Claim 4
Dependent Claim
82 words
The system of claim 2 including separate ratio detector means each having a first input coupled to the output of one of said band-pass filter means, and means for averaging the outputs of each combination of two band-pass filter means and for coupling each average thereof to a second input of one of said ratio detectors, said ratio detector means providing said information signal when the amplitude at said first input exceeds the amplitude at said second input by a predetermined amount.
Claim 5
Dependent Claim
22 words
The system of claim 3 including means for producing a pulse for each of said information signals and for processing said pulses.
Claim 6
Dependent Claim
17 words
The system of claim 3 including means for adjusting the threshold limit of said ratio detector means.
References Cited (Backward Citations)
US3341810A
Cited
US3525978A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-18 | 1975-04-19 | 1975-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-18 | 1979-04-19 | 1979-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-18 | 1983-04-19 | 1983-10-19 | $7700.00 | Window Closed / Lapsed |