US3717728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjusting circuit for a chrominance signal amplifier in a color television receiver using a differential amplifier suitable for an integrated circuit
Assignee: Individual
•
Filing: 1971-04-08
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Granted: 1973-02-20
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Expires: 1991-04-08
Abstract
Abstract In a chrominance signal amplifier stage including a current branch circuit of the long-tailed pair type and a load resistor in one of the current branches from which a burst signal is obtained, the amplitude of this burst signal is rendered independent of a bias or control voltage active on a branch current by blocking current branches which are not connected to the load resistor.
Inventors
- 👤 W Smeulers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:55
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/64; H04N9/68
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
200 words
A circuit for adjusting the ratio between the chroma burst and the chrominance video amplitude of a composite chrominance television signal, said circuit comprising a chrominance signal input means adapted to receive said composite chrominance signal; first, second and third transistors each having emitter, base, and collector electrodes, said first transistor base being coupled to said input means, said first transistor collector being coupled to said second and third transistors emitters; a load impedance having a first end coupled to said second transistor collector and a second end adapted to be coupled to a voltage source; a pulse signal input means adapted to receive a pulse signal during the occurrence of said chroma bursts and coupled to at least one of said bases of said second and third transistors; a gain adjusting input adapted to receive a gain adjusting signal and coupled to at least one of the bases of said second and third transistors; and a signal output means coupled to said second transistor collector for providing an output signal comprising said composite chrominance signal, wherein the amplitude ratio of said burst and said chrominance video signal is a selected value independent of the amplitude of said chroma burst.
Claim 2
Dependent Claim
200 words
A circuit for adjusting the ratio between the chroma burst and the chrominance video amplitude of a composite chrominance television signal, said circuit comprising a chrominance signal input means adapted to receive said composite chrominance signal; first, second and third transistors each having emitter, base, and collector electrodes, said first transistor base being coupled to said input means, said first transistor collector being coupled to said second and third transistors emitters; a load impedance having a first end coupled to said second transistor collector and a second end adapted to be coupled to a voltage source; a pulse signal input means adapted to receive a pulse signal during the occurrence of said chroma bursts and coupled to at least one of said bases of said second and third transistors; a gain adjusting input adapted to receive a gain adjusting signal and coupled to at least one of the bases of said second and third transistors; and a signal output means coupled to said second transistor collector for providing an output signal comprising said composite chrominance signal, wherein the amplitude ratio of said burst and said chrominance video signal is a selected value independent of the amplitude of said chroma burst.
Claim 3
Dependent Claim
200 words
A circuit for adjusting the ratio between the chroma burst and the chrominance video amplitude of a composite chrominance television signal, said circuit comprising a chrominance signal input means adapted to receive said composite chrominance signal; first, second and third transistors each having emitter, base, and collector electrodes, said first transistor base being coupled to said input means, said first transistor collector being coupled to said second and third transistors emitters; a load impedance having a first end coupled to said second transistor collector and a second end adapted to be coupled to a voltage source; a pulse signal input means adapted to receive a pulse signal during the occurrence of said chroma bursts and coupled to at least one of said bases of said second and third transistors; a gain adjusting input adapted to receive a gain adjusting signal and coupled to at least one of the bases of said second and third transistors; and a signal output means coupled to said second transistor collector for providing an output signal comprising said composite chrominance signal, wherein the amplitude ratio of said burst and said chrominance video signal is a selected value independent of the amplitude of said chroma burst.
Claim 4
Dependent Claim
200 words
A circuit for adjusting the ratio between the chroma burst and the chrominance video amplitude of a composite chrominance television signal, said circuit comprising a chrominance signal input means adapted to receive said composite chrominance signal; first, second and third transistors each having emitter, base, and collector electrodes, said first transistor base being coupled to said input means, said first transistor collector being coupled to said second and third transistors emitters; a load impedance having a first end coupled to said second transistor collector and a second end adapted to be coupled to a voltage source; a pulse signal input means adapted to receive a pulse signal during the occurrence of said chroma bursts and coupled to at least one of said bases of said second and third transistors; a gain adjusting input adapted to receive a gain adjusting signal and coupled to at least one of the bases of said second and third transistors; and a signal output means coupled to said second transistor collector for providing an output signal comprising said composite chrominance signal, wherein the amplitude ratio of said burst and said chrominance video signal is a selected value independent of the amplitude of said chroma burst.
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) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |