US4032966A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drop out compensation device
Assignee: Philips North America LLC
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Filing: 1975-09-10
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Granted: 1977-06-28
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Expires: 1995-09-10
Abstract
Abstract A device for compensating dropouts in color television signal modulated by a carrier wave. The modulated video signal is applied to a first delay line, from whose output signal a luminance component delayed by one line period is derived with the aid of a demodulator, and is also applied through a second demodulator and a chrome separating filter to a second one line delay line. The sum of the delayed chrominance and luminance components are substitution for the demodulated color television signal during a dropout.
Inventors
- 👤 George Churchill Kenney
- 👤 Adrianus Huibert Hoogendijk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:44
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/79; H04N9/87; H04N9/88; H04N9/882
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
273 words
A drop-out compensation device for compensating for drop-outs in a modulated color television video signal, comprising a first demodulator having an input terminal connected to the input of said compensation device for converting said video signal into a demodulated composite luminance-chroma signal, a first filter means connected to an output of said first demodulator for separating the chroma from said composite demodulated signal, a first delay line connected to an output of said first filter means for delaying said chroma signal by one television line period, a second delay line connected to the input terminal of the compensation device and to the input of said first demodulator for delaying the modulated color television signal by one television line, a second demodulator connected to an output of said second delay line for demodulating said delayed video signal, second filter means connected to an output of said second demodulator for separating said luminance signal from said delayed modulated video signal, a drop-out detector connected to the input of said compensating device for providing a drop-out detection signal, an output terminal for said compensation device, and an output summing and switching circuit means connected to the output terminal of said compensation device, to the drop-out detector, to the first demodulator, to said first delay line and to said second filter means for providing the output of said first demodulator to said compensation device output terminal in the absence of a drop-out detection signal and for providing a signal corresponding to the sum of the output signals from said first delay line and said second filter means is response to the presence of a drop-out detection signal.
Claim 2
Dependent Claim
273 words
A drop-out compensation device for compensating for drop-outs in a modulated color television video signal, comprising a first demodulator having an input terminal connected to the input of said compensation device for converting said video signal into a demodulated composite luminance-chroma signal, a first filter means connected to an output of said first demodulator for separating the chroma from said composite demodulated signal, a first delay line connected to an output of said first filter means for delaying said chroma signal by one television line period, a second delay line connected to the input terminal of the compensation device and to the input of said first demodulator for delaying the modulated color television signal by one television line, a second demodulator connected to an output of said second delay line for demodulating said delayed video signal, second filter means connected to an output of said second demodulator for separating said luminance signal from said delayed modulated video signal, a drop-out detector connected to the input of said compensating device for providing a drop-out detection signal, an output terminal for said compensation device, and an output summing and switching circuit means connected to the output terminal of said compensation device, to the drop-out detector, to the first demodulator, to said first delay line and to said second filter means for providing the output of said first demodulator to said compensation device output terminal in the absence of a drop-out detection signal and for providing a signal corresponding to the sum of the output signals from said first delay line and said second filter means is response to the presence of a drop-out detection signal.
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) | 1980-06-27 | 1980-12-27 | 1981-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-27 | 1984-12-27 | 1985-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-27 | 1988-12-27 | 1989-06-28 | $7700.00 | Window Closed / Lapsed |