US3674919A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disabling circuitry,for automatic frequency hue control
Assignee: RCA Licensing Corp
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Filing: 1970-10-26
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Granted: 1972-07-04
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Expires: 1990-10-26
Abstract
Abstract First and second selector switch means are provided for adding or subtracting reactive elements from phase shift circuits which supply chroma signals to the demodulator stages of a color television receiver. First and second disabling switch means are placed in shunt with the reactive elements and associated switch means for disabling the phase shift circuits during fine adjustment of various controls by a viewer. A third disabling switch is provided for removing a bias provided by an automatic frequency control module from the tuner stage of the receiver. All three disabling switches are linked together for simultaneous operation such that tuning and color signal control circuitry is disabled to allow the receiver to be adjusted manually. The disabling switches may then be opened, allowing the automatic frequency control and phase shifting circuits to resume their functions.
Inventors
- 👤 Donald E Garrett
- 👤 Theodore V Zaloudek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:03
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/64; H04N9/643
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
68 words
In a color television receiver including automatic frequency control means and further including hue control means for rendering flesh tones in a displayed image insensitive to aberrations in the phase of a received signal, means for simultaneously disabling said automatic frequency control means and said hue control means whereby a more sensitive response of the receiver is permitted in order to facilitate accurate manual adjustment of the receiver
Claim 2
Dependent Claim
68 words
In a color television receiver including automatic frequency control means and further including hue control means for rendering flesh tones in a displayed image insensitive to aberrations in the phase of a received signal, means for simultaneously disabling said automatic frequency control means and said hue control means whereby a more sensitive response of the receiver is permitted in order to facilitate accurate manual adjustment of the receiver
Claim 3
Dependent Claim
122 words
In a color television receiver including automatic frequency control means, means for deriving a chroma signal and first and second demodulator means, said receiver further including first phase shifting means for shifting the phase of the chroma signal and for transmitting said signal to said first demodulator, and second phase shifting means for shifting the phase of said chroma signal and for transmitting said signal to said second demodulator: first switch means for selectively varying the phase shift imparted to said signal by said first and second second phase shifting means; and second switch means for simultaneously disabling said automatic frequency control means and shunting said chroma signal derived from said bandpass amplifier means about said first and second phase shifting means.
Claim 4
Dependent Claim
122 words
In a color television receiver including automatic frequency control means, means for deriving a chroma signal and first and second demodulator means, said receiver further including first phase shifting means for shifting the phase of the chroma signal and for transmitting said signal to said first demodulator, and second phase shifting means for shifting the phase of said chroma signal and for transmitting said signal to said second demodulator: first switch means for selectively varying the phase shift imparted to said signal by said first and second second phase shifting means; and second switch means for simultaneously disabling said automatic frequency control means and shunting said chroma signal derived from said bandpass amplifier means about said first and second phase shifting means.
Claim 5
Dependent Claim
37 words
The invention as defined in claim 2, wherein said first phase shifting means imparts a lagging phase shift to said chroma signal, and said second phase shifting means imparts a leading phase shift to said chroma signal.
Claim 6
Dependent Claim
71 words
The invention as defined in claim 3, wherein said first switch means includes a plurality of contacts for selectively connecting inductive means in a series with said first demodulator, and first coupling means for selectively coupling pairs of said contacts; and said switch means further includes a plurality of contacts for selectively connecting capacitive means in series with said second demodulator, and second coupling means for selectively coupling pairs of contacts.
Claim 7
Dependent Claim
40 words
The invention as defined in claim 4, wherein said first and second coupling means comprise a pair of spaced conductive elements, and further including means for supporting said elements in spaced relationship for slidable engaging selected pairs of said contacts.
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) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |