US4317189A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voice frequency signal actuated tape recorder
Assignee: Olympus Corp
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Filing: 1979-12-10
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Granted: 1982-02-23
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Expires: 1999-12-10
Abstract
Abstract A voice starting device for actuating a tape recorder with a voice signal is disclosed. In the device, a comparator compares the voice signal with a preset reference voltage and actuates a switching element for driving a motor circuit. A charging circuit stores the output of the comparator to maintain the output of the comparator for a predetermined time after termination of the voice signal.
Inventors
- 👤 Norio Fukuoka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:34
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/02; G11B15/023
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
142 words
A starting device for a tape recorder by voice signal comprising an FM receiver section having an FM detector means coupled to the detector for detecting a modulated voice signal, a reference voltage source, a first comparator for generating an output signal by comparing the output FM signal of the FM receiver with a reference voltage preset by the reference voltage source, a switching element controlled and actuated by the output signal of the first comparator, a charging and discharging circuit connected to the element for holding the output signal of the first comparator for a predetermined time after termination of the voice signal, a second comparator connected to receive the terminal voltage of the charging and discharging circuit for controlling a motor, said reference voltage source being connected for supplying the preset reference voltage to the first and the second comparators.
Claim 2
Dependent Claim
142 words
A starting device for a tape recorder by voice signal comprising an FM receiver section having an FM detector means coupled to the detector for detecting a modulated voice signal, a reference voltage source, a first comparator for generating an output signal by comparing the output FM signal of the FM receiver with a reference voltage preset by the reference voltage source, a switching element controlled and actuated by the output signal of the first comparator, a charging and discharging circuit connected to the element for holding the output signal of the first comparator for a predetermined time after termination of the voice signal, a second comparator connected to receive the terminal voltage of the charging and discharging circuit for controlling a motor, said reference voltage source being connected for supplying the preset reference voltage to the first and the second comparators.
Claim 3
Dependent Claim
46 words
A starting device as in claim 1, wherein the FM receiver section comprises a mixer circuit for mixing the output signal of a local oscillator with a signal received by an antenna and the charging and discharging circuit comprising at least a capacitor and a resistor.
Claim 4
Dependent Claim
25 words
A starting device as in claim 1, wherein the FM detector circuit is a quadrature detector and the switching element is an NPN type transistor.
Claim 5
Dependent Claim
47 words
A starting device as in claim 1, wherein the reference voltage source comprises a resistance type voltage divider provided between buses, and the reference voltage of the divider is supplied to an inverted input of the first comparator and to a non-inverted input of the second comparator.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-02-22 | 1985-08-24 | 1986-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-02-22 | 1989-08-24 | 1990-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-02-22 | 1993-08-24 | 1994-02-23 | $7700.00 | Window Closed / Lapsed |