US3213191A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods and circuitries for transmitting a color television sub-carrier
Assignee: Compagnie Francaise de Television SA
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Filing: 1961-08-31
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Granted: 1965-10-19
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Expires: 1981-08-31
Abstract
No abstract record available.
Inventors
- 👤 France Henri De
- 👤 Cassagne Pierre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:28
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/44; H04N9/45; H04N11/00; H04N11/06; H04N11/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
205 words
A METHOD FOR REDUCING THE VISIBILITY OF THE SUB-CARRIER IN COLOR TELEVISION SYSTEMS WHEREIN A SUB-CARRIER IS ALTERNATELY MODULATED BY TWO CHROMINANCE INFORMATIONS, THE ALTENRATION TAKING PLACE AT THE LINE FREQUENCY, THE TOTAL NUMBER OF L INES OF THE COMPLETE IMAGE BEING 2PQ1, WHERE P IS AN INTEGER, AND THE SCANNING BEING INTERLACED, SAID METHOD COMPRISING THE STEPS OF: (A) GENERATING A SUB-CARRIER WAVE HAVING A FIXED PHASE AT THE BEGINNING OF EACH SCANNING LINE; (B) ALTERNATELY MODULATING SAID SUBCARRIER WAVE BY SAID TWO CHROMINANCE INFORMATIONS, THE ALTERNATION OCCURRING AT THE LINE FREQUENCY; (C) REVERSING THE PHASE OF SAID SUB-CARRIER WAVE FOR THE RESPECTIVE DURATIONS OF V PREDETERMINED LINES WITHIN EACH OF ALL THE SUCCESSIVE GROUPS OF P SUCCESSIVE SCANNING LINES, P BEING AN INTEGER GREATER THAN 2 AND BEING A DIVISOR OF P IF P IS AN EVEN NUMBER AND A DIVISOR OF P+1 IF P IS AN ODD NUMBER, V BEING A POSITIVE INTEGER SMALLER THAN P, AND SAID PREDETERMINED LINES OCCUPYING THE SAME RELATIVE POSITIONS WITHIN EACH OF SAID GORUPS AND (D) REVERSING THE PHASE OF SAID SUB-CARRIER WAVE FOR THE DURATION OF ONE OUT OF TWO SUCCESSIVE FIELDS THE PHASE REVERSINGS OF STEPS (D) BEING SUPERIMPOSED ON THOSE OF STEP (C).
Claim 2
Independent Claim
205 words
A METHOD FOR REDUCING THE VISIBILITY OF THE SUB-CARRIER IN COLOR TELEVISION SYSTEMS WHEREIN A SUB-CARRIER IS ALTERNATELY MODULATED BY TWO CHROMINANCE INFORMATIONS, THE ALTENRATION TAKING PLACE AT THE LINE FREQUENCY, THE TOTAL NUMBER OF L INES OF THE COMPLETE IMAGE BEING 2PQ1, WHERE P IS AN INTEGER, AND THE SCANNING BEING INTERLACED, SAID METHOD COMPRISING THE STEPS OF: (A) GENERATING A SUB-CARRIER WAVE HAVING A FIXED PHASE AT THE BEGINNING OF EACH SCANNING LINE; (B) ALTERNATELY MODULATING SAID SUBCARRIER WAVE BY SAID TWO CHROMINANCE INFORMATIONS, THE ALTERNATION OCCURRING AT THE LINE FREQUENCY; (C) REVERSING THE PHASE OF SAID SUB-CARRIER WAVE FOR THE RESPECTIVE DURATIONS OF V PREDETERMINED LINES WITHIN EACH OF ALL THE SUCCESSIVE GROUPS OF P SUCCESSIVE SCANNING LINES, P BEING AN INTEGER GREATER THAN 2 AND BEING A DIVISOR OF P IF P IS AN EVEN NUMBER AND A DIVISOR OF P+1 IF P IS AN ODD NUMBER, V BEING A POSITIVE INTEGER SMALLER THAN P, AND SAID PREDETERMINED LINES OCCUPYING THE SAME RELATIVE POSITIONS WITHIN EACH OF SAID GORUPS AND (D) REVERSING THE PHASE OF SAID SUB-CARRIER WAVE FOR THE DURATION OF ONE OUT OF TWO SUCCESSIVE FIELDS THE PHASE REVERSINGS OF STEPS (D) BEING SUPERIMPOSED ON THOSE OF STEP (C).
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) | 1968-10-18 | 1969-04-19 | 1969-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-18 | 1973-04-19 | 1973-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-18 | 1977-04-19 | 1977-10-19 | $7700.00 | Window Closed / Lapsed |