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US3970774A
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Electronic signal mixer
Assignee: RCA Corp
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Filing: 1975-03-31
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Granted: 1976-07-20
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Expires: 1995-03-31
Abstract
Abstract An electronic signal mixer is provided for combining first and second signals by additively (or differentially) combining the first and second signals to provide a first output signal. The first and second signals are further combined in a multiplier circuit to provide an output signal which is a differential (or additive) combination of the first and second signals multiplied by a coefficient determined by a control voltage applied to the multiplier. The first combined signal and the product output of the multiplier are further combined to provide a resultant signal comprised of any proportionality of the first and second signals in accordance with the value of the control voltage.
Inventors
- 👤 Lucas John Bazin
- 👤 Gary Ray Peterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:58
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/64; H04N9/68; H04N9/69; G; G06; G06G; G06G7/00; G06G7/12; G06G7/14
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
176 words
A signal mixer comprising: a pair of terminals for receiving first and second signals respectively; first combining means coupled to said pair of terminals for providing an additive combination of said first and second signals; a multiplier having a first input circuit coupled to said pair of terminals, a second input circuit for connection to a source of control voltage, and an output circuit for developing an output signal which is an additive combination of said first and second signals multiplied by a coefficient determined by said control voltage; second combining means coupled to said first combining means to receive the additive combination of said first and second signals, and coupled to said multiplier output circuit to receive the additive combination of said first and second signals multiplied by said coefficient, one of said additive combinations of said first and second signals produced by said first combining means and said multiplier comprising the difference between said first and second signals and the other of said additive combinations comprising the sum of said first and second signals.
Claim 2
Dependent Claim
176 words
A signal mixer comprising: a pair of terminals for receiving first and second signals respectively; first combining means coupled to said pair of terminals for providing an additive combination of said first and second signals; a multiplier having a first input circuit coupled to said pair of terminals, a second input circuit for connection to a source of control voltage, and an output circuit for developing an output signal which is an additive combination of said first and second signals multiplied by a coefficient determined by said control voltage; second combining means coupled to said first combining means to receive the additive combination of said first and second signals, and coupled to said multiplier output circuit to receive the additive combination of said first and second signals multiplied by said coefficient, one of said additive combinations of said first and second signals produced by said first combining means and said multiplier comprising the difference between said first and second signals and the other of said additive combinations comprising the sum of said first and second signals.
Claim 3
Dependent Claim
28 words
A signal mixer according to claim 1 wherein said first signal is a video signal and said second signal has a predetermined exponential relationship to said video signal.
Claim 4
Dependent Claim
29 words
A signal mixer according to claim 1 wherein said first and second combining means comprises an amplifier whose output signal is a summation of the input signals applied thereto.
Claim 5
Dependent Claim
18 words
A signal mixer according to claim 1 wherein said control voltage is remotely located from said signal mixer.
Claim 6
Dependent Claim
218 words
A signal mixer for altering the gamma characteristics of a video signal translating channel comprising: a source of video signals V IN ; means for providing a source of nonlinear video signals having a predetermined exponential relationship to said video signals; first combining means coupled to said video signals and said nonlinear video signals for providing an additive combination of said video and nonlinear video signals; a multiplier having a first input circuit coupled to said video and said nonlinear video signals, a second input circuit for connection to a source of control voltage, and an output circuit for developing an output signal which is an additive combination of said video and said nonlinear video signals multiplied by a coefficient determined by said control voltage; second combining means coupled to said first combining means to receive the additive combination of said video and nonlinear video signals, and coupled to said multiplier output circuit to receive the additive combination of said video and said nonlinear signals multiplied by said co-efficient, one of said additive combinations of said video and nonlinear video signals produced by said first combining means and said multiplier comprising the difference between said video and said nonlinear video signals and the other of said additive combinations comprising the sum of said video and nonlinear video signals.
Claim 7
Dependent Claim
218 words
A signal mixer for altering the gamma characteristics of a video signal translating channel comprising: a source of video signals V IN ; means for providing a source of nonlinear video signals having a predetermined exponential relationship to said video signals; first combining means coupled to said video signals and said nonlinear video signals for providing an additive combination of said video and nonlinear video signals; a multiplier having a first input circuit coupled to said video and said nonlinear video signals, a second input circuit for connection to a source of control voltage, and an output circuit for developing an output signal which is an additive combination of said video and said nonlinear video signals multiplied by a coefficient determined by said control voltage; second combining means coupled to said first combining means to receive the additive combination of said video and nonlinear video signals, and coupled to said multiplier output circuit to receive the additive combination of said video and said nonlinear signals multiplied by said co-efficient, one of said additive combinations of said video and nonlinear video signals produced by said first combining means and said multiplier comprising the difference between said video and said nonlinear video signals and the other of said additive combinations comprising the sum of said video and nonlinear video signals.
Claim 8
Dependent Claim
17 words
A signal mixer according to claim 5 wherein said first combining means comprises a resistive voltage divider.
Claim 9
Dependent Claim
16 words
A signal mixer according to claim 5 wherein said second combining means comprises a differential amplifier.
Claim 10
Dependent Claim
23 words
A signal mixer according to claim 5 wherein said nonlinear source of video signals comprises said video signals raised to the one-half power.
Claim 11
Dependent Claim
18 words
A signal mixer according to claim 5 wherein said control voltage is remotely located from said signal mixer.
References Cited (Backward Citations)
US3752905A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-20 | 1980-01-19 | 1980-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-20 | 1984-01-19 | 1984-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-20 | 1988-01-19 | 1988-07-20 | $7700.00 | Window Closed / Lapsed |