US3813488A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Video stripper
Assignee: RCA Licensing Corp
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Filing: 1973-03-08
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Granted: 1974-05-28
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Expires: 1993-03-08
Abstract
Abstract This disclosure describes a circuit which is gated to amplify the video portion of a television signal to the exclusion of its synchronizing components, and which permits the amplitude adjusted, the gated signal to be adjsuted, yet without altering the value of its black level.
Inventors
- 👤 J Cavett
- 👤 R Hopkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:01
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
173 words
In a television image transmission system of the type wherein an audio communications link having limited available dynamic range is employed to transmit a particular frame of television information to a remote receiver location and wherein said information typically includes video signal components and synchronizing signal components, the combination therewith of: first means adapted to receive and amplify said video and synchronizing signal components; second means to de-activate said first means during the synchronizing signal component interval of said frame of television information, whereby substantially only the video signal components thereof are amplified; third means for deriving amplified output signals from said first means, said third means including a variable impedance for adjusting the amplitude of the output signal derived, but referenced to a direct current level of substantially fixed magnitude corresponding to the signal level derived by said third means during said synchronizing signal component interval when said first means is de-activated; and fourth means for coupling said output signal to said audio communications link for transmission to said remote receiver location.
Claim 2
Dependent Claim
173 words
In a television image transmission system of the type wherein an audio communications link having limited available dynamic range is employed to transmit a particular frame of television information to a remote receiver location and wherein said information typically includes video signal components and synchronizing signal components, the combination therewith of: first means adapted to receive and amplify said video and synchronizing signal components; second means to de-activate said first means during the synchronizing signal component interval of said frame of television information, whereby substantially only the video signal components thereof are amplified; third means for deriving amplified output signals from said first means, said third means including a variable impedance for adjusting the amplitude of the output signal derived, but referenced to a direct current level of substantially fixed magnitude corresponding to the signal level derived by said third means during said synchronizing signal component interval when said first means is de-activated; and fourth means for coupling said output signal to said audio communications link for transmission to said remote receiver location.
Claim 3
Dependent Claim
26 words
The combination of claim 1 wherein said third means derives an amplified output signal of adjustable amplitude referenced to a substantially zero volt direct current level.
Claim 4
Dependent Claim
49 words
The combination of claim 2 wherein said audio communications link is characterized by the ability to couple an applied signal of predetermined magnitude into the transmission path and wherein said third means derives an output signal of an amplitude which is adjustable to the extent of such predetermined magnitude.
Claim 5
Dependent Claim
13 words
The combination of claim 3 wherein said variable impedance includes a potentiometer device.
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) | 1977-05-27 | 1977-11-26 | 1978-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-27 | 1981-11-26 | 1982-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-27 | 1985-11-26 | 1986-05-28 | $7700.00 | Window Closed / Lapsed |