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Patent US3673324A successfully refreshed from Google Patents.
US3673324A
Expired / Lapsed
US
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Video mixing/special effects amplifiers
Assignee: NEC Corp
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Filing: 1970-12-22
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Granted: 1972-06-27
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Expires: 1990-12-22
Abstract
Abstract Amplifier apparatus for operating on plural video signals to provide signal mixing, special effects and the like employs parallel video signal processing circuits which supply their output signals to a common video mixer. A keying signal processor is included for developing control voltages for separately varying video gain in the video processing circuits on a time shared basis. The composite arrangement thereby allows independent level control for the multi-channel video information vis-a-vis control signals such as synchronizing signals and/or a color burst.
Inventors
- 👤 Yutaka Ito
- 👤 Jun Hirate
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:11
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/64; H04N9/74; H04N9/76
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
153 words
A video mixing/special effect amplifier for television signals comprising a video signal and at least one control signal; a plurality of like circuit arrangements connected in parallel, each of said arrangements comprising a serially connected combination of a video clamping circuit for clamping the blanking level of a television signal applied thereto at a predetermined potential, and a video gain control circuit for varying the level of said television signal in accordance with a control voltage applied thereto, a video mixer connected to the outputs of said like circuit arrangements; and a keying signal processor for generating two kinds of control voltages for application to each of said video gain control circuits on a time-sharing basis, one of said control voltages controlling the level of said control signal included in said television signal, and the other of said control voltages for controlling the level only of said video signal of said television signal.
Claim 2
Dependent Claim
153 words
A video mixing/special effect amplifier for television signals comprising a video signal and at least one control signal; a plurality of like circuit arrangements connected in parallel, each of said arrangements comprising a serially connected combination of a video clamping circuit for clamping the blanking level of a television signal applied thereto at a predetermined potential, and a video gain control circuit for varying the level of said television signal in accordance with a control voltage applied thereto, a video mixer connected to the outputs of said like circuit arrangements; and a keying signal processor for generating two kinds of control voltages for application to each of said video gain control circuits on a time-sharing basis, one of said control voltages controlling the level of said control signal included in said television signal, and the other of said control voltages for controlling the level only of said video signal of said television signal.
Claim 3
Dependent Claim
21 words
A combination as in claim 1, wherein said control signal comprises at least one of sync signals and color burst signals.
Claim 4
Dependent Claim
63 words
A combination as in claim 2 wherein said keying processor comprises plural control arrangements, each comprising the series connections of a keying gain control circuit, a keying signal mixer, and clamping circuit means, means for generating a periodic control signal, and switch means for connecting the output of said periodic control signal generating means to a selected one of said plural control arrangements.
Claim 5
Dependent Claim
17 words
A combination as in claim 3, further comprising logic circuit means for selectively actuating said switch means.
Claim 6
Dependent Claim
22 words
A combination as in claim 4, further comprising plural source means for supplying composite video signals to said plural like circuit arrangements.
Claim 7
Dependent Claim
22 words
A combination as in claim 1, further comprising plural source means for supplying composite video signals to said plural like circuit arrangements.
Claim 8
Dependent Claim
18 words
A combination as in claim 3, further comprising fader control means connected to said keying gain control circuits.
Claim 9
Dependent Claim
76 words
A combination as in claim 2, wherein said keying processor comprises plural parallel circuit means, each including a signal mixer and a clamping circuit serially connected thereto, a special effects waveform generator, a phase splitting circuit connecting said waveform generator to said plural parallel means, means for generating a periodic control signal, and switch means for connecting the output of said periodic control signal generating means to a selected one of said plural parallel circuit means.
References Cited (Backward Citations)
US3374119A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |