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Patent US3569923A successfully refreshed from Google Patents.
US3569923A
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Adaptive acoustic detector apparatus
Assignee: United States Department of the Navy
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Filing: 1967-10-30
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Granted: 1971-03-09
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Expires: 1987-10-30
Abstract
Abstract An adaptive acoustic detector provides a signal for switching on the power supply of approximately positioned transmitter upon the detection of desired information which may comprise either a continuous or an impulse acoustic signal, irrespective of the attendant background noise. A composite signal composed of both the desired information and background noise is separated by a background insensitive amplifier which selectively feeds back only the background information thereby allowing the unattenuated passage of the desired information. An appropriate detector, upon the receipt of the desired information, permits the passage of a signal indicative thereof to provide the above mentioned switching signal. The invention described herein may be manufactured and used by or for the Government of the United States of America for governmental purposes without the payment of any royalties thereon or therefor.
Inventors
- 👤 Henry Naubereit
- 👤 David L Baddorf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:58
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/16; G08B13/1654; G08B13/1672; Y; Y10; Y10S; Y10S367/00; Y10S367/901
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
147 words
An apparatus for detecting vehicle movement or troop movement in a jungle environment, comprising: acoustic sensing means for providing an electrical signal within a predetermined range upon the receipt thereto of sound signals; a background insensitive amplifier connected with and responsive to said acoustic sensor means for selectively providing a first signal between a first set of frequency limits and a second signal between a second set of frequency limits; first detector means connected to said amplifier and receiving said first signal and said second signal for providing a third signal indicative of said vehicle movement; second detector means connected to said amplifier and receiving only said first signal for providing a fourth signal indicative of said troop movement; and a logic gate connected to said first and said second detector means for providing an output signal upon receiving either said third signal or said fourth signal.
Claim 2
Independent Claim
147 words
An apparatus for detecting vehicle movement or troop movement in a jungle environment, comprising: acoustic sensing means for providing an electrical signal within a predetermined range upon the receipt thereto of sound signals; a background insensitive amplifier connected with and responsive to said acoustic sensor means for selectively providing a first signal between a first set of frequency limits and a second signal between a second set of frequency limits; first detector means connected to said amplifier and receiving said first signal and said second signal for providing a third signal indicative of said vehicle movement; second detector means connected to said amplifier and receiving only said first signal for providing a fourth signal indicative of said troop movement; and a logic gate connected to said first and said second detector means for providing an output signal upon receiving either said third signal or said fourth signal.
Claim 3
Dependent Claim
37 words
The invention as defined in claim 1 wherein: said logic gate output signal activates the power supply switch of a proximately positioned transmitter thereby to effect transmission of the electrical signal provided by said acoustic sensing means.
Claim 4
Dependent Claim
74 words
The invention as defined in claim 1 wherein said background insensitive amplifier comprises: first filter means operatively connected to said sensing means for passing a first preselected portion of said electrical signal thereby providing said first signal; and second filter means operatively connected to receive said first signal for feeding back a predetermined portion thereof to said first filter means and for passing a second predetermined portion, said second portion being said second signal.
Claim 5
Dependent Claim
100 words
The invention as defined in claim 3 wherein said first detector means comprises: first means responsive to said first signal passed by said first filter means; second means responsive to said second signal passed by said second filter means; difference amplifier means interposed between and responsive to said first means and said second means for providing a signal when said first means receives a signal different from that received by said second means; and delay means responsive to the signal produced by said difference amplifier means for providing said third signal to said logic gate after a predetermined time delay.
Claim 6
Dependent Claim
77 words
The invention as defined in claim 3 wherein said second detector comprises: first amplifier means responsive to said first signal passed by said first filter means; second amplifier means connected to said first amplifier means for reducing the output level thereof at a predetermined rate; and delay responsive means connected to said first amplifier means and said second amplifier means for providing said fourth signal to said logic gate upon the expiration of a predetermined time delay.
Claim 7
Dependent Claim
103 words
The invention as defined in claim 3 wherein said background insensitive amplifier further comprises: first amplifying means connected between said sensing means and said first filter means for amplifying said electrical signal; second amplifying means connected to the output of said first filter means for amplifying said first signal passed thereby; automatic gain control means connected to the inputs of said first amplifying means and said second amplifying means for maintaining the gain of said second amplifying means at a constant level; and an emitter follower connected to said second amplifier means for providing signals to said first and said second detector means.
Claim 8
Dependent Claim
77 words
The invention as defined in claim 4 wherein said delay means comprises: a first resistor; a capacitor connected at one end thereof to said first resistor; a second resistor; and a silicone-controlled switch interposed between said connection and said second resistor whereby said capacitor stores electrical energy for a predetermined time as governed by said first resistor and discharges said energy through said second resistor after having charged to a predetermined trigger level of said silicone-controlled switch.
Claim 9
Dependent Claim
147 words
Acoustic detecting apparatus, comprising: acoustic sensing means receiving an acoustic signal; first filter means operatively connected to said sensing means for passing a preselected portion of said signal; second filter means operatively connected to receive the signal passed by said first filter means for feeding back thereto a predetermined portion thereof and for passing a second predetermined portion; first detector means connected to receive only said signal passed by said first filter means for providing a first output signal upon the detection of a first desired signal; second detector means connected to receive said signal passed by said first and said second filter means for providing a second output signal upon the detection of a second desired signal; and a logic gate connected to said first and said second detector means for providing a third output signal upon receiving either said first or said second output signal.
Claim 10
Dependent Claim
147 words
Acoustic detecting apparatus, comprising: acoustic sensing means receiving an acoustic signal; first filter means operatively connected to said sensing means for passing a preselected portion of said signal; second filter means operatively connected to receive the signal passed by said first filter means for feeding back thereto a predetermined portion thereof and for passing a second predetermined portion; first detector means connected to receive only said signal passed by said first filter means for providing a first output signal upon the detection of a first desired signal; second detector means connected to receive said signal passed by said first and said second filter means for providing a second output signal upon the detection of a second desired signal; and a logic gate connected to said first and said second detector means for providing a third output signal upon receiving either said first or said second output signal.
Claim 11
Dependent Claim
98 words
The invention as defined in claim 8 wherein said second detector means comprises: first means responsive to said signaL passed by said first filter means; second means responsive to said signal passed by said second filter means; difference amplifier means interposed between and responsive to first means and said second means for providing a signal when said first means receives a signal different from that received by said second means; and delay means responsive to the signal produced by said difference amplifier means for providing said second output signal to said logic gate after a predetermined time delay.
Claim 12
Dependent Claim
78 words
The invention as defined in claim 8 wherein said first detector means comprises: first amplifier means responsive to the signal passed by said first filter means; second amplifier means connected to said first amplifier means for reducing the output level thereof at a predetermined rate; and delay responsive means connected to said first amplifier means and said second amplifier means for providing said first output signal to said logic gate upon the expiration of a predetermined time delay.
Claim 13
Dependent Claim
78 words
The invention as defined in claim 9 wherein said delay responsive means comprises: a first resistor; a capacitor connected at one end thereof to said first resistor; a second resistor; and a silicone-controlled switch interposed between said connection and said second resistor whereby said capacitor stores electrical energy for a predetermined time as governed by said first resistor and discharges said energy through said second resistor after having charged to a predetermined trigger level of said silicone-controlled switch.
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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) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |