FR2318549A1 - Secam system colour TV demodulator - has phase correcting circuit to provide correct chrominance signals - Google Patents
Secam system colour TV demodulator - has phase correcting circuit to provide correct chrominance signalsInfo
- Publication number
- FR2318549A1 FR2318549A1 FR7621995A FR7621995A FR2318549A1 FR 2318549 A1 FR2318549 A1 FR 2318549A1 FR 7621995 A FR7621995 A FR 7621995A FR 7621995 A FR7621995 A FR 7621995A FR 2318549 A1 FR2318549 A1 FR 2318549A1
- Authority
- FR
- France
- Prior art keywords
- circuit
- switching circuit
- demodulator
- correcting circuit
- chrominance signals
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/44—Colour synchronisation
- H04N9/47—Colour synchronisation for sequential signals
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Processing Of Color Television Signals (AREA)
Abstract
The demodulator unit has a pass-band filter (1) which transmits frequency modulated components containing the red chrominance and blue chrominance difference signals. There is also a delay circuit (2) which receives an output signal from the filter (1), and a switching circuit (3) which is equivalent to a double two-pole changeover switch. The switching circuit (3) is connected to separate limiters (6, 7) and frequency discriminators (8, 9). The switching circuit (3) can interconnect any one of its two inputs to any one of its two outputs according to whether the red or the blue chrominance difference signal is sent to one or the other of the demodulators (8, 9). The switching circuit (3) is controlled by horizontal synchronisation pulses modified by a delay circuit (22), an inhibitor gate circuit (23) and a flip-flop circuit (5). The unit also has an integrating circuit connected to one of the demodulators (9) to integrate the demodulated colour identification signal.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP50087611A JPS5821871B2 (en) | 1975-07-17 | 1975-07-17 | SECAM Hoshikino Color - Television Television Shingouno Irofukuchiyo Cairo |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR2318549A1 true FR2318549A1 (en) | 1977-02-11 |
| FR2318549B1 FR2318549B1 (en) | 1982-08-06 |
Family
ID=13919757
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR7621995A Granted FR2318549A1 (en) | 1975-07-17 | 1976-07-19 | Secam system colour TV demodulator - has phase correcting circuit to provide correct chrominance signals |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS5821871B2 (en) |
| FR (1) | FR2318549A1 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR91122E (en) * | 1965-11-29 | 1968-04-19 | Cft Comp Fse Television | Further training in color television systems |
-
1975
- 1975-07-17 JP JP50087611A patent/JPS5821871B2/en not_active Expired
-
1976
- 1976-07-19 FR FR7621995A patent/FR2318549A1/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR91122E (en) * | 1965-11-29 | 1968-04-19 | Cft Comp Fse Television | Further training in color television systems |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5211721A (en) | 1977-01-28 |
| FR2318549B1 (en) | 1982-08-06 |
| JPS5821871B2 (en) | 1983-05-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| ST | Notification of lapse |