US3829606A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilizing device for the synchronous detector of an agc video feedback loop
Assignee: Panasonic Holdings Corp
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Filing: 1973-01-11
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Granted: 1974-08-13
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Expires: 1993-01-11
Abstract
Abstract A clipping circuit is interconnected between the output terminal of a video IF amplifier and the input terminal of a synchronous detector so that when the IF signal output exceeds a predetermined permissible input voltage to be applied to the synchronous detector, the IF signal output is clipped in amplitude so as not to exceed the permissible input voltage.
Inventors
- 👤 Y Kawamata
- 👤 K Yamamoto
- 👤 N Yamaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:31
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/44; H04N5/455; H03; H03D; H03D1/00; H03D1/22; H03D1/229
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
96 words
A television receiver comprising a video IF amplifier, a synchronous detector, an AGC circuit connected to automatically control the output of said video IF amplifier in response to the output of said synchronous detector, and a clipping circuit having an input terminal connected to the output terminal of said video IF amplifier and an output terminal connected to the input terminal of said synchronous detector, whereby the amplitude of the IF signal applied to said synchronous detector by way of said clipping circuit is limited to a predetermined maximum permissible input voltage at said synchronous detector.
Claim 2
Dependent Claim
96 words
A television receiver comprising a video IF amplifier, a synchronous detector, an AGC circuit connected to automatically control the output of said video IF amplifier in response to the output of said synchronous detector, and a clipping circuit having an input terminal connected to the output terminal of said video IF amplifier and an output terminal connected to the input terminal of said synchronous detector, whereby the amplitude of the IF signal applied to said synchronous detector by way of said clipping circuit is limited to a predetermined maximum permissible input voltage at said synchronous detector.
Claim 3
Dependent Claim
59 words
A television receiver as set forth in claim 1 wherein said clipping circuit comprises two DC cutoff capacitors interconnected in series between said input and output terminals of said clipping circuit and a parallel circuit consisting of two diodes connected in parallel with opposite polarities, said parallel circuit being connected between the junction of said two capacitors and ground.
Claim 4
Dependent Claim
52 words
A television receiver as set forth in claim 1 wherein said clipping circuit comprises 2 DC cutoff capacitors interconnected in series between said input and output terminals of said clipping circuit, and a diode and a reference voltage source interconnected in series between the junction between said DC cutoff capacitors and ground.
Claim 5
Dependent Claim
119 words
In a television receiver of the type having a video IF amplifier, a synchronous detector, means applying the output of said IF amplifier to said synchronous detector, and an AGC circuit connected to automatically control the output of said video IF amplifier in response to the output of said synchronous detector, and wherein said synchronous detector is of the type having an output voltage to input voltage characteristic that increases with input voltage to a predetermined input voltage level and decreases with input voltage above said level; the improvement wherein said means applying the output of said video IF amplifier to said synchronous detector comprises clipping circuit means for limiting the input to said synchronous detector to said level.
Claim 6
Dependent Claim
119 words
In a television receiver of the type having a video IF amplifier, a synchronous detector, means applying the output of said IF amplifier to said synchronous detector, and an AGC circuit connected to automatically control the output of said video IF amplifier in response to the output of said synchronous detector, and wherein said synchronous detector is of the type having an output voltage to input voltage characteristic that increases with input voltage to a predetermined input voltage level and decreases with input voltage above said level; the improvement wherein said means applying the output of said video IF amplifier to said synchronous detector comprises clipping circuit means for limiting the input to said synchronous detector to said level.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |