US4188549A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustically responsive sensor switch
Assignee: Federal Screw Works
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Filing: 1977-11-11
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Granted: 1980-02-12
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Expires: 1997-11-11
Abstract
Abstract A miniaturized acoustically responsive sensor switch that is responsive to localized acoustic sounds including a transducer and a conditioning circuit that is adapted to convert the audio signal produced by the transducer in response to the detection of an acoustic sound into a single output pulse.
Inventors
- 👤 Mark V. Dorais
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:02
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/94; H04; H04R; H04R1/00; H04R1/14
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
150 words
An acoustically responsive sensor switch comprising: transducer means for detecting a localized acoustic sound and producing an electrical audio signal in response thereto; and circuit means connected to said transducer means for producing a switching signal in response to said audio signal including magnitude comparator means for comparing the magnitude of said audio signal with the magnitude of a threshold signal and producing a square-wave output signal, integrator means having a response time greater than the duration of a single pulse of said square-wave signal connected to said comparator means for integrating said square-wave signal, and trigger circuit means connected to said integrator means for producing an output signal that is initiated when the magnitude of said integrated signal decreases below (exceeds) a predetermined turn-on level and is terminated when the magnitude of said integrated signal exceeds (decreases below) a predetermined turn-off level greater (less) than said predetermined turn-on level.
Claim 2
Dependent Claim
150 words
An acoustically responsive sensor switch comprising: transducer means for detecting a localized acoustic sound and producing an electrical audio signal in response thereto; and circuit means connected to said transducer means for producing a switching signal in response to said audio signal including magnitude comparator means for comparing the magnitude of said audio signal with the magnitude of a threshold signal and producing a square-wave output signal, integrator means having a response time greater than the duration of a single pulse of said square-wave signal connected to said comparator means for integrating said square-wave signal, and trigger circuit means connected to said integrator means for producing an output signal that is initiated when the magnitude of said integrated signal decreases below (exceeds) a predetermined turn-on level and is terminated when the magnitude of said integrated signal exceeds (decreases below) a predetermined turn-off level greater (less) than said predetermined turn-on level.
Claim 3
Dependent Claim
27 words
The sensor switch of claim 1 further including sensitivity control means for controlling the sensitivity of said sensor switch by varying the magnitude of said threshold signal.
Claim 4
Dependent Claim
58 words
The sensor switch of claim 1 wherein said integrator means includes a capacitor, discharging means for rapidly discharging said capacitor when said square-wave signal switches from a first level to a second level, and charging means for charging said capacitor at a relatively slow rate when said square-wave signal switches from said second level to said first level.
Claim 5
Dependent Claim
60 words
The sensor switch of claim 3 wherein said charging means is adapted to charge said capacitor at a rate that will not permit said capacitor to attain a level of charge greater than said predetermined turn off level of said trigger circuit means in the period of time corresponding to the duration of a single pulse of said square-wave signal.
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) | 1983-02-11 | 1983-08-13 | 1984-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-11 | 1987-08-13 | 1988-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-11 | 1991-08-13 | 1992-02-12 | $7700.00 | Window Closed / Lapsed |