US3968437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Receiver including an automatic tuning correction suppression circuit coupled to a tuning member
Assignee: US Philips Corp
•
Filing: 1975-05-21
•
Granted: 1976-07-06
•
Expires: 1995-05-21
Abstract
Abstract Switching off the automatic tuning correction of a receiver during tuning is accomplished with a signal derived from a level variation caused by a level adjusting circuit coupled to a tuning member.
Inventors
- 👤 Kan Kie Ong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:45
CPC Classifications
H; H03; H03J; H03J7/00; H03J7/02; H03J7/023
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
89 words
Tuning means for an oscillator tuning member, said tuning means comprising automatic tuning correction means, automatic tuning correction suppression means for coupling to said tuning member and said automatic tuning correction means, said suppression means having a suppression activation input terminal, a tuning signal level adjusting circuit, means for applying a voltage to said adjusting circuit, tuning signal level variation detector including a differentiator coupled to said adjusting circuit and said suppression activation input to render said automatic tuning correction means inactive when said adjusting circuit output is varied.
Claim 2
Dependent Claim
89 words
Tuning means for an oscillator tuning member, said tuning means comprising automatic tuning correction means, automatic tuning correction suppression means for coupling to said tuning member and said automatic tuning correction means, said suppression means having a suppression activation input terminal, a tuning signal level adjusting circuit, means for applying a voltage to said adjusting circuit, tuning signal level variation detector including a differentiator coupled to said adjusting circuit and said suppression activation input to render said automatic tuning correction means inactive when said adjusting circuit output is varied.
Claim 3
Dependent Claim
47 words
A tuning means as claimed in claim 1 in which the level variation detector includes a phase inverter circuit coupled to said differentiator and having outputs for signals in phase opposition which outputs are coupled at least though a rectifier circuit to the tuning correction suppression circuit.
Claim 4
Dependent Claim
50 words
A tuning means as claimed in claim 2, wherein an output of the rectifier circuit is coupled to a comparison circuit first input, and further comprising an averaging circuit having inputs coupled to the outputs of the phase inverter circuit and an output coupled to the comparison circuit second input.
Claim 5
Dependent Claim
25 words
A tuning means as claimed in claim 3, further comprising a threshold circuit, an output of the comparison circuit being coupled to said threshold circuit.
Claim 6
Dependent Claim
29 words
A tuning means as claimed in claim 1, wherein the output of the level variation detector means includes a capacitor means for providing a time constant of several seconds.
References Cited (Backward Citations)
US3806817A
Cited
US3889193A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-06 | 1980-01-05 | 1980-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-06 | 1984-01-05 | 1984-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-06 | 1988-01-05 | 1988-07-06 | $7700.00 | Window Closed / Lapsed |