US3763310A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reference signal indicating apparatus for a tint-adjusting in color television receivers
Assignee: Panasonic Holdings Corp
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Filing: 1972-05-22
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Granted: 1973-10-02
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Expires: 1992-05-22
Abstract
Abstract A reference signal indicating apparatus for a tint-adjusting in a color television receiver, said apparatus indicating a reference signal on a television screen for a tint-adjusting whenever viewers want to adjust the tint of color television receiver. This apparatus inserts a pulsed sine wave, having a phase and a frequency identical to those of the color burst signal, into carrier chrominance signals during appropriate period in scanning intervals and displays only red color difference (R-Y) output signals on the television screen during the period. A portion on the screen according to the period has two kinds of hues, one of which changes according to the tintadjuting. When the portion on the screen has the same hue, the tint-adjusting is correct.
Inventors
- 👤 T Sagishima
- 👤 M Furuhasi
- 👤 R Sasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:15
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/64; H04N9/643
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
151 words
A reference signal indicating apparatus for a tint-adjusting in a color television receiver having a first chroma amplifier, video amplifiers and a color demodulator, said apparatus comprising: reference signal inserting means coupled to the first chroma amplifier for inserting reference signals into carrier chrominance signals during indicating intervals of the reference signals, said reference signals consisting of interval without signals and pulsed sine wave signals having a phase and a frequency identical to those of the color burst signals; luminance switching means located between the video amplifiers for making the level of video signals constant during the indicating intervals; chroma switching means coupled to a color demodulator for making the level of (G-Y) and (B-Y) color difference signals constant during the indicating intervals of the reference signals; and pulse generating means for generating pulse signals to control said reference signal inserting means, said luminance switching means and said chroma switching means.
Claim 2
Dependent Claim
151 words
A reference signal indicating apparatus for a tint-adjusting in a color television receiver having a first chroma amplifier, video amplifiers and a color demodulator, said apparatus comprising: reference signal inserting means coupled to the first chroma amplifier for inserting reference signals into carrier chrominance signals during indicating intervals of the reference signals, said reference signals consisting of interval without signals and pulsed sine wave signals having a phase and a frequency identical to those of the color burst signals; luminance switching means located between the video amplifiers for making the level of video signals constant during the indicating intervals; chroma switching means coupled to a color demodulator for making the level of (G-Y) and (B-Y) color difference signals constant during the indicating intervals of the reference signals; and pulse generating means for generating pulse signals to control said reference signal inserting means, said luminance switching means and said chroma switching means.
Claim 3
Dependent Claim
128 words
A refErence signal indicating apparatus for a tint-adjusting in a color television receiver as claimed in claim 1, wherein said reference signal inserting means comprises: a color burst gate coupled to said first chroma amplifier for extracting the color burst signals from carrier chrominance signals; a subcarrier generator coupled to said color burst gate for generating continuous sine wave signals having the phase and the frequency identical to those of said color burst signals; an analog gate coupled to said subcarrier generator for extracting sine wave signals from said continuous sine wave signals during an appropriate interval; and a further analog gate coupled to said analog gate for passing output signals of said analog gate instead of carrier chrominance signals during the indicating interval of the reference signals.
Claim 4
Dependent Claim
117 words
A reference signal indicating apparatus for a tint-adjusting in a color television receiver as claimed in claim 1, wherein said chroma switching means comprises: an analog gate coupled to said color demodulator for making the level of (G-Y) color difference signals constant during the indicating interval of the reference signals; a level generator coupled to said analog gate for generating said constant level in the (G-Y) color difference signals; a further analog gate coupled to said color demodulator for making the level of (B-Y) color difference signals constant during said indicating interval of the reference signals, and a leverl generator coupled to said further analog gate for generating the constant level in the (B-Y) colora difference signals.
Claim 5
Dependent Claim
63 words
A reference signal indicating apparatus for a tint-adjusting in a color television receiver as claimed in claim 1, wherein said luminance switching means comprises: an analog gate coupled to said video amplifier for making the level of the video signals constant during said indicating interval of the reference signals; and a level generator coupled to said analog gate for generating said constant level.
Claim 6
Dependent Claim
87 words
A reference signal indicating apparatus for a tint-adjusting in a color television receiver as claimed in claim 1, wherein said pulse generating means comprises: a pulse generator for generating pulse signals to control said reference signal inserting means, said luminance switching means and said chroma switching means; and a pulse generator controller coupled to said pulse generator for controlling said pulse generator so that said reference signals are indicated on the television screen only when a viewer wants to adjust the tint of the color television receiver.
References Cited (Backward Citations)
US2858368A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |