US3590167A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid-state control circuitry for audio information playback apparatus
Assignee: PHI TECHNOLOGIES Inc
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Filing: 1968-10-01
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Granted: 1971-06-29
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Expires: 1988-10-01
Abstract
Abstract An apparatus for the operation and control of a record playback teaching device, the apparatus consisting of electrical circuitry for playing back information from a dual-channel record whereby one channel carries pertinent tutoring information while the other channel carries attendant control signals intermittently recorded therealong. A first playback circuit transduces and amplifies the audio information for reproduction through an audible presentation device, while a second channel transduces and amplifies a control actuation signal upon occurrence for the purpose of controlling application of drive power to the record playback mechanism.
Inventors
- 👤 David D Price Jr
- 👤 Carl A Helber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:02
CPC Classifications
G; G09; G09B; G09B5/00; G09B5/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
329 words
Electrical circuitry for conTrol of dual-channel record playback device having a series of information sequences recorded on a first channel, and having a control signal recorded on a second channel at intermittent spacings which denote the end of an information sequence on said first channel, the circuitry comprising: first playback means supported by said playback device in transducing contact with said record first channel and providing an information signal output; second playback means supported by said playback device in transducing contact with said record second channel and intermittently providing a control signal output; first amplifier means receiving said information signal output from said first playback means to provide amplified audio output signal; reproducing means receiving said audio output signal and providing an audible output; second amplifier means receiving said control signal output from said playback means at predetermined intervals to generate a control actuation signal; a DC bias source; transistor means having the base connected to said DC bias source thereby biasing said transistor means to conduction, and said transistor means having the collector connected to provide an enabling output when in conduction; a DC power source; voltage regulator means to provide DC drive power output; control switch means connected to the collector enabling output of said transistor means and enabled by conduction of said transistor means to apply DC energizing power from said DC power source to said voltage regulator means; drive motor means driving said record playback device; motor control switch means connected to apply said DC drive power output from said voltage regulator means to energize said drive motor means for selective forward and reverse energization; and semiconductive controlled rectifier means having the anode connected to said DC-bias source, the cathode connected common, and the gate electrode connected to receive said control actuation signal from said second amplifier means causing conduction of said controlled rectifier means to short said DCbias source and cut off conduction of said transistor means thereby to deenergize said drive motor means.
Claim 2
Dependent Claim
329 words
Electrical circuitry for conTrol of dual-channel record playback device having a series of information sequences recorded on a first channel, and having a control signal recorded on a second channel at intermittent spacings which denote the end of an information sequence on said first channel, the circuitry comprising: first playback means supported by said playback device in transducing contact with said record first channel and providing an information signal output; second playback means supported by said playback device in transducing contact with said record second channel and intermittently providing a control signal output; first amplifier means receiving said information signal output from said first playback means to provide amplified audio output signal; reproducing means receiving said audio output signal and providing an audible output; second amplifier means receiving said control signal output from said playback means at predetermined intervals to generate a control actuation signal; a DC bias source; transistor means having the base connected to said DC bias source thereby biasing said transistor means to conduction, and said transistor means having the collector connected to provide an enabling output when in conduction; a DC power source; voltage regulator means to provide DC drive power output; control switch means connected to the collector enabling output of said transistor means and enabled by conduction of said transistor means to apply DC energizing power from said DC power source to said voltage regulator means; drive motor means driving said record playback device; motor control switch means connected to apply said DC drive power output from said voltage regulator means to energize said drive motor means for selective forward and reverse energization; and semiconductive controlled rectifier means having the anode connected to said DC-bias source, the cathode connected common, and the gate electrode connected to receive said control actuation signal from said second amplifier means causing conduction of said controlled rectifier means to short said DCbias source and cut off conduction of said transistor means thereby to deenergize said drive motor means.
Claim 3
Dependent Claim
41 words
The electrical circuitry as set forth in claim 1 which is further characterized to include: normally open pushbutton switch means which is connected in parallel with said semiconductive controlled rectifier means between said biased base of the transistor means and common.
References Cited (Backward Citations)
US3084226A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |