US3676939A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Student responder teaching device
Assignee: EDAIDS Inc
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Filing: 1970-04-17
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Granted: 1972-07-18
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Expires: 1990-04-17
Abstract
Abstract An electronic device for use in facilitating the teacher-tostudents communications during tutoring sessions. The device consists of a central control console which is operated by the teacher in conjunction with a plurality of individual transmitter units each used by a student to effect a response. Each student transmitter is capable of operating at a selected one of plural discrete frequencies which are indicative of a selected answer or choice selection, and the control console utilizes a heterodyne receiver with frequency scanning means capable of monitoring the required frequency spectrum. The control console also includes electronic circuitry for evaluating and displaying individual and group student information thereafter to provide further output of the data for computer and related data processing equipment.
Inventors
- 👤 Charles V Oberst
- 👤 Glen C Oberst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:15
CPC Classifications
G; G09; G09B; G09B7/00; G09B7/06; G09B7/07; G09B7/073
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
171 words
A system of communication between an instructor and one or more students for registering multiple choice student response to one or more response situations, comprising: plural student response transmitters each having plural answer keys, oscillator means for transmitting continuous wave radio energy at respectively different and progressively higher predetermined discrete frequencies so as to identify each of said response transmitters and the particular multiple choice response selected by a student at each of said response transmitters; and a control console for receiving said transmitted continuous wave radio energy from all said transmitters, said control console including frequency synthesizer means for generating periodic, successive reference frequency signals at discrete, progressively higher frequency values means for comparing said transmitted and reference discrete frequency signals; automatic scanning means in said control console adapted to dwell at each of said different and progressively higher discrete frequences so as to sample and identify each of said student responses transmitted to determine the student unit and selected answer response for each of said plural student response transmitters.
Claim 2
Independent Claim
171 words
A system of communication between an instructor and one or more students for registering multiple choice student response to one or more response situations, comprising: plural student response transmitters each having plural answer keys, oscillator means for transmitting continuous wave radio energy at respectively different and progressively higher predetermined discrete frequencies so as to identify each of said response transmitters and the particular multiple choice response selected by a student at each of said response transmitters; and a control console for receiving said transmitted continuous wave radio energy from all said transmitters, said control console including frequency synthesizer means for generating periodic, successive reference frequency signals at discrete, progressively higher frequency values means for comparing said transmitted and reference discrete frequency signals; automatic scanning means in said control console adapted to dwell at each of said different and progressively higher discrete frequences so as to sample and identify each of said student responses transmitted to determine the student unit and selected answer response for each of said plural student response transmitters.
Claim 3
Dependent Claim
89 words
A system as set forth in claim 1 wherein each of said plural student response transmitters comprises: oscillator and output amplifier means driving an antenna which radiates transmitted radio frequency energy; crystal means connected to the input of said oscillator to cause oscillation at a characteristic frequency for the particular student transmitter; and plural resonant circuits selectively actuatable in accordance with a predetermined student response for connection in series with said crystal means to cause pre-selected alteration of said transmitted radio frequency energy in accordance with student response selection.
Claim 4
Dependent Claim
86 words
A system as set forth in claim 1 wherein said console means comprises: frequency synthesizing means generating sequentially a plurality of reference frequency signals; input means receiving said transmitted radio frequency energy to generate a radio frequency signal which may include each of said transmitted radio energy signals from said plural student response transmitters; mixer means receiving as inputs each of said radio frequency signals as well as said successive reference frequency signals to provide a characteristic answer output signal indicative of the particular transmitter responding.
Claim 5
Dependent Claim
89 words
A system as set forth in claim 3 wherein each of said plural student response transmitters comprise: oscillator and output amplifier means driving an antenna which radiates transmitted radio frequency energy; crystal means connected to the input of said oscillator to cause oscillation at a characteristic frequency for the particular student transmitter; and plural resonant circuits selectively actuatable in accordance with a predetermined student response for connection in series with said crystal means to cause pre-selected alteration of said transmitted radio frequency energy in accordance with student response selection.
Claim 6
Dependent Claim
92 words
A system as set forth in claim 3 wherein said frequency synthesizing means comprises: voltage controlled oscillator means providing said reference frequency output signal; variable divider means receiving said reference frequency output signal to provide a plurality of sequential output control signals of predetermined duration and successive frequency difference; oscillator means generating a reference control signal; and phase detection means receiving said output control signal for comparison with said reference control signal to generate an output voltage value for application to said voltage controlled oscillator means to control the output frequency thereof.
Claim 7
Dependent Claim
51 words
A system as set forth in claim 3 wherein said input means comprises: antenna means for sensing said transmitted radio frequency energy to provide a radio frequency input signal; and radio frequency amplifier means receiving said radio frequency input signal to provide an output radio frequency signal to said mixer means.
Claim 8
Dependent Claim
76 words
A system as set forth in claim 3 wherein said mixer means comprises: oscillator means providing a fixed frequency output; first mixer means receiving said successive reference frequency signals and said fixed frequency signal to provide as output a first mixer output signal; second mixer means receiving said radio frequency signal from said input means and said first mixer output signal to produce a second mixer output signal which is characteristic of the particular transmitter responding.
Claim 9
Dependent Claim
100 words
A system as set forth in claim 7 wherein said mixer means is further characterized to include: second oscillator means providing a second fixed frequency output signal; third mixer means receiving said second mixer output signal and said second mixer frequency output signal to provide a third mixer output signal which is characteristic of the particular transmitter responding; counter means receiving said third mixer output signal to provide a plurality of count outputs; logic means receiving each of the plural count outputs to derive respective outputs indicating the particular one of the multiple choice student responses registered by a student.
Claim 10
Dependent Claim
86 words
A system as set forth in claim 8 which is further characterized to include: digital storage means including an input logic network for receiving digital output from said logic means to provide continual binary storage of successive multiple choice response selections; and comparator means receiving input which is harmonically related to said reference frequency signal from said frequency synthesizing means to provide comparator output to said logic network to identify the particular discrete frequency of transmitted radio energy and therefore the student making said response selection.
Claim 11
Dependent Claim
51 words
A system as set forth in claim 9 which is further characterized to include: switching means for interrogating said storage means to provide digital output indicative of student response selection for each student; digital display means for receiving said interrogated output digital signals to provide visual readout of the desired information.
Claim 12
Dependent Claim
71 words
A system as set forth in claim 8 which is further characterized to include: digital filter means including counter input means for receiving said third mixer output signal to determine presence of one of a plurality of narrow-band frequency components in said third mixer output signal; said filter means providing digital output indicating the response selection; decoder means receiving said digital output signal to provide a digital output indicating answer selection.
References Cited (Backward Citations)
US3416243A
Cited
US3364437A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |