US3875337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for monitoring a classroom
Assignee: Individual
•
Filing: 1974-03-15
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Granted: 1975-04-01
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Expires: 1994-03-15
Abstract
Abstract Audible sounds produced by student members of a classroom are monitored for instructional purposes by a method that includes arranging the student members of a class into a plurality of spatially-located groups. Separate electrical signals are generated proportional to the level of audible sound produced by each of the groups. These signals are then separately amplified and biased to provide a predetermined sensitivity signal level. The bias signals are used to control the flow of current in separate electrical circuits that are interconnected in a manner to control separate light indicators, a buzzer and a radio receiver or other form of sound-producing apparatus.
Inventors
- 👤 Earl K Bradley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:48
CPC Classifications
G; G01; G01H; G01H3/00; G01H3/10; G01H3/12
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
122 words
A method to monitor the relative level of at least two sources of audible sounds produced by student members of a class, said method including the steps of: arranging the student members of a class into a plurality of spatially-located groups, generating a separate electrical signal proportional to the level of audible sounds produced by each of said groups of students, separately amplifying each of said electrical signals, biasing the separately-amplified electrical signals to provide a predetermined sensitivity signal level, using the bias signals separately to control the flow of current in an electrical circuit including indicator means for each of said bias signals, and inhibiting the operation of one of said indicator means when another of said indicator means is activated.
Claim 2
Independent Claim
122 words
A method to monitor the relative level of at least two sources of audible sounds produced by student members of a class, said method including the steps of: arranging the student members of a class into a plurality of spatially-located groups, generating a separate electrical signal proportional to the level of audible sounds produced by each of said groups of students, separately amplifying each of said electrical signals, biasing the separately-amplified electrical signals to provide a predetermined sensitivity signal level, using the bias signals separately to control the flow of current in an electrical circuit including indicator means for each of said bias signals, and inhibiting the operation of one of said indicator means when another of said indicator means is activated.
Claim 3
Dependent Claim
37 words
The method according to claim 1 including the further step of providing an outside source of audible sound to contribute to the level of audible sound produced by the aggregate of such student members of a class.
Claim 4
Dependent Claim
28 words
The method according to claim 2 including the further step of controlling said outside source of audible sound to terminate upon activation of one of said indicating means.
Claim 5
Dependent Claim
23 words
The method according to claim 1 including the further step of resetting said electrical circuit to deactivate an indicator means after activation thereof.
Claim 6
Dependent Claim
19 words
The method according to claim 1 wherein each of said bias signals is separately used to actuate two indicators.
Claim 7
Dependent Claim
18 words
The method according to claim 5 wherein said two indicators include a sound indicator and a light indicator.
Claim 8
Dependent Claim
19 words
The method according to claim 3 wherein said outside source of audible sound is a receiver for radiowave transmissions.
Claim 9
Dependent Claim
15 words
The method of claim 1 wherein said separate electrical signals are generated by directional microphones.
Claim 10
Dependent Claim
54 words
The method of claim 1 wherein the electrical circuit receiving each of said bias signals includes an SCR controlled by a separately-amplified biased electrical signal, the solenoid coil and contact points for said indicating means, said contact points further inhibiting the energization of the solenoid coil in a different one of said electrical circuits.
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) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |