GB1207541A - Apparatus for the remote synchronization of colour television signals - Google Patents
Apparatus for the remote synchronization of colour television signalsInfo
- Publication number
- GB1207541A GB1207541A GB45668A GB45668A GB1207541A GB 1207541 A GB1207541 A GB 1207541A GB 45668 A GB45668 A GB 45668A GB 45668 A GB45668 A GB 45668A GB 1207541 A GB1207541 A GB 1207541A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- switching
- remote station
- phase
- signal
- 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.)
- Expired
Links
- 239000002131 composite material Substances 0.000 abstract 2
- 230000005540 biological transmission Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/44—Colour synchronisation
- H04N9/475—Colour synchronisation for mutually locking different synchronisation sources
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Processing Of Color Television Signals (AREA)
- Color Television Systems (AREA)
Abstract
1,207,541. Colour television; automatic frequency control. FERNSEH G.m.b.H. 3 Jan., 1968 [3 Jan., 1967], No. 456/68. Headings H4F and H3A. To synchronize colour television signal including a chrominance signal switched in phase at line frequency e.g. " PAL " or " SECAM " (Registered Trade Marks) signals, derived from a remote station with signals generated at a central station. Two control voltages and two switching signals i.e. YES/NO signals, are derived by comparing the composite colour signal generated at the central station with the composite colour signal transmitted from the remote station, and these control and switching signals are transmitted from the central station to the remote station to effect synchronization of the remote station. The first control voltage and the first switching signal are derived by frequency and phase comparison between the horizontal and vertical synchronizing impulses respectively and correspond to any frequency and/or phase differences. The second control voltage is derived by frequency and phase comparison between the chrominance subcarriers, preferably the colour bursts, and the second switching signal is derived by comparing information denotive of the switching phase for line sequential transmission of the chrominance signal i.e. the switching phases of the colour bursts. At the remote station the first control voltage synchronizes an oscillator operating at twice line frequency by means of a reactance circuit, and the first switching signal produces a variation of the horizontal frequency until the correct frame coincidence between the vertical synchronization pulses is attained. The second control voltage readjusts the frequency and phase of the chrominance sub-carrier generator by means of a reactance circuit and the second switching voltage switches over the phase of the remote station coder identification pulse generator if the switching phase of the central and remote station do not coincide. The control and switching signals are preferably transmitted from the central to the remote station by a frequency-division multiplex process employing frequency modulation and using a sound-radio line.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1967F0051160 DE1280292B (en) | 1967-01-03 | 1967-01-03 | Method for the automatic remote synchronization of branch offices from a central office for color television signals of the PAL type |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1207541A true GB1207541A (en) | 1970-10-07 |
Family
ID=7104385
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB45668A Expired GB1207541A (en) | 1967-01-03 | 1968-01-03 | Apparatus for the remote synchronization of colour television signals |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE1280292B (en) |
| GB (1) | GB1207541A (en) |
| NL (1) | NL159555B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2158664A (en) * | 1984-05-03 | 1985-11-13 | Emi Plc Thorn | Television signal generator |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2317044C3 (en) * | 1973-04-05 | 1982-04-29 | Grundig E.M.V. Elektro-Mechanische Versuchsanstalt Max Grundig & Co KG, 8510 Fürth | Circuit arrangement for the synchronization of television cameras |
| US4038683A (en) * | 1975-04-04 | 1977-07-26 | Rca Corporation | Television synchronizing generator |
| JPS53145417A (en) * | 1977-05-23 | 1978-12-18 | Tektronix Inc | Method of and device for testing color tv signal |
-
1967
- 1967-01-03 DE DE1967F0051160 patent/DE1280292B/en not_active Withdrawn
-
1968
- 1968-01-02 NL NL6800016A patent/NL159555B/en not_active IP Right Cessation
- 1968-01-03 GB GB45668A patent/GB1207541A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2158664A (en) * | 1984-05-03 | 1985-11-13 | Emi Plc Thorn | Television signal generator |
Also Published As
| Publication number | Publication date |
|---|---|
| NL159555B (en) | 1979-02-15 |
| NL6800016A (en) | 1968-07-04 |
| DE1280292B (en) | 1968-10-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |