Patent US3594919A successfully refreshed from Google Patents.
US3594919A
Expired / Lapsed
US
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Tutoring devices
Assignee: PHI TECHNOLOGIES Inc
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Filing: 1969-09-23
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Granted: 1971-07-27
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Expires: 1989-09-23
Abstract
Abstract Apparatus for dissemination of programmed information for purposes of tutoring and the like. The apparatus comprising a plural channel record and playback device, each channel being connected to supply input to an audio and a control tone processing channel, respectively; the audio information being reproduced audibly for the benefit of one or more students or users, while the control tone processing channel provides selectively placed periodic control tones for purposes of controlling the playback and learning functions. The apparatus includes specific circuitry for automatically repeating a predetermined segment of recorded audio information, as well as tone discrimination means responsive to predetermined auxiliary control tones to cause periodic actuation of selected auxiliary equipment operating in coaction with the tutoring device.
Inventors
- 👤 Lawrence R De Bell
- 👤 David D Price Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:47
CPC Classifications
G; G09; G09B; G09B5/00; G09B5/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
235 words
A teaching machine for dissemination of selected recorded information comprising: an information record having plural record channels with audio information recorded on at least one channel and a related control tone periodically recorded on at least one parallel channel; playback transport means receiving said information record and including drive means for imparting movement to said information record; first pickup and amplifier means for playing back said at least one channel of audio information to produce an audio output signal; second pickup and amplifier means for playing back said at least one channel of periodic control tone to produce a periodic control tone signal; reproducing mean receiving said audio output signal and providing an audible information output; semiconductive controlled rectifier means which is energized into conduction upon receipt of one of said periodic control tone signals input to the gate electrode of said controlled rectifier; amplifier means which is rendered nonconductive in response to conduction of said semiconductive controlled rectifier to deenergize the drive means of said playback transport means to cease movement of said information record; restart means actuatable to disable said controlled rectifier means to permit starting of said play back transport means; reverse means which is energizable to reverse said playback transport means to back up said information record; and time delay means energized upon actuation of said reversing means and actuatable upon expiration of said time delay to deenergize said reversing means.
Claim 2
Dependent Claim
235 words
A teaching machine for dissemination of selected recorded information comprising: an information record having plural record channels with audio information recorded on at least one channel and a related control tone periodically recorded on at least one parallel channel; playback transport means receiving said information record and including drive means for imparting movement to said information record; first pickup and amplifier means for playing back said at least one channel of audio information to produce an audio output signal; second pickup and amplifier means for playing back said at least one channel of periodic control tone to produce a periodic control tone signal; reproducing mean receiving said audio output signal and providing an audible information output; semiconductive controlled rectifier means which is energized into conduction upon receipt of one of said periodic control tone signals input to the gate electrode of said controlled rectifier; amplifier means which is rendered nonconductive in response to conduction of said semiconductive controlled rectifier to deenergize the drive means of said playback transport means to cease movement of said information record; restart means actuatable to disable said controlled rectifier means to permit starting of said play back transport means; reverse means which is energizable to reverse said playback transport means to back up said information record; and time delay means energized upon actuation of said reversing means and actuatable upon expiration of said time delay to deenergize said reversing means.
Claim 3
Dependent Claim
77 words
A teaching machine as set forth in claim 1 wherein said time delay means comprises: unijunction transistor means; resistance-capacitance time delay means connected to provide the trigger input to energize said unijunction transistor means into a conductive state; and switch means actuatable to energize said reverse means, and to energize said resistance-capacitance time delay means and said unijunction transistor means such that said unijunction transistor means conducts after said predetermined time delay to deenergize said reverse means.
Claim 4
Dependent Claim
66 words
A teaching machine as set forth in claim 1 which is further characterized to include: auxiliary tone means recorded in superposition on said control tone channel of said information record; tone discrimination means receiving said control tone signal from said second playback means to provide an auxiliary tone signal output; auxiliary control output means energized by said auxiliary tone signal to provide a predetermined control output.
References Cited (Backward Citations)
US3294924A
Cited
US3405461A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |