Patent US3967203A successfully refreshed from Google Patents.
US3967203A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signal seeking receiver stopping circuit
Assignee: Motors Liquidation Co
•
Filing: 1975-03-03
•
Granted: 1976-06-29
•
Expires: 1995-03-03
Abstract
Abstract A circuit for generating a center tuned pulse for stopping the operation of a signal seeking FM receiver includes means for developing a bias current which is added to the output currents of the quadrature detector of the receiver. A stopping pulse is generated whenever the difference between the output currents is less than the bias current and a 10.7 mHz. signal is present in the IF amplifier.
Inventors
- 👤 Larry D. Lucas
- 👤 Burtron D. Schertz
- 👤 Lester Wilkinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:38
CPC Classifications
H; H03; H03J; H03J7/00; H03J7/18
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
121 words
In an FM receiver having IF amplifier means, and quadrature detector means responsive to the output of said IF amplifier and which produce first and second output currents which are equal when said receiver is center tuned, the improvement comprising means for generating a bias current, means responsive to said first and second output currents and to said bias current for generating an output voltage when the difference between said first and second output currents is less than said bias current, and means responsive to the output of said IF amplifier for inhibiting the generation of said output voltage unless a 10.7 mHz. signal is present in said IF amplifier and capacitance means adapted to be charged from said output voltage.
Claim 2
Dependent Claim
121 words
In an FM receiver having IF amplifier means, and quadrature detector means responsive to the output of said IF amplifier and which produce first and second output currents which are equal when said receiver is center tuned, the improvement comprising means for generating a bias current, means responsive to said first and second output currents and to said bias current for generating an output voltage when the difference between said first and second output currents is less than said bias current, and means responsive to the output of said IF amplifier for inhibiting the generation of said output voltage unless a 10.7 mHz. signal is present in said IF amplifier and capacitance means adapted to be charged from said output voltage.
Claim 3
Dependent Claim
142 words
In an FM receiver having IF amplifier means, and quadrature detector means responsive to the output of said IF amplifier and which produces first and second output currents which are equal when said receiver is center tuned, the improvement comprising means for generating a bias current, means for summing said bias current and said first output current to produce a third current, means for summing said bias current and said second output current for producing a fourth current, means responsive to said second output current exceeding said third current or said first output current exceeding said fourth current for generating an output voltage, means responsive to the output of said IF amplifier for inhibiting the generation of said output voltage unless a 10.7 mHz. signal is present in said IF amplifier, and capacitance means adapted to be charged from said output voltage.
Claim 4
Dependent Claim
142 words
In an FM receiver having IF amplifier means, and quadrature detector means responsive to the output of said IF amplifier and which produces first and second output currents which are equal when said receiver is center tuned, the improvement comprising means for generating a bias current, means for summing said bias current and said first output current to produce a third current, means for summing said bias current and said second output current for producing a fourth current, means responsive to said second output current exceeding said third current or said first output current exceeding said fourth current for generating an output voltage, means responsive to the output of said IF amplifier for inhibiting the generation of said output voltage unless a 10.7 mHz. signal is present in said IF amplifier, and capacitance means adapted to be charged from said output voltage.
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) | 1979-06-29 | 1979-12-29 | 1980-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-29 | 1983-12-29 | 1984-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-29 | 1987-12-29 | 1988-06-29 | $7700.00 | Window Closed / Lapsed |