GB1240361A - Synchronising arrangements for television systems - Google Patents
Synchronising arrangements for television systemsInfo
- Publication number
- GB1240361A GB1240361A GB2074569A GB2074569A GB1240361A GB 1240361 A GB1240361 A GB 1240361A GB 2074569 A GB2074569 A GB 2074569A GB 2074569 A GB2074569 A GB 2074569A GB 1240361 A GB1240361 A GB 1240361A
- Authority
- GB
- United Kingdom
- Prior art keywords
- error
- phase
- local
- signal
- pulses
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/04—Synchronising
- H04N5/06—Generation of synchronising signals
- H04N5/067—Arrangements or circuits at the transmitter end
- H04N5/073—Arrangements or circuits at the transmitter end for mutually locking plural sources of synchronising signals, e.g. studios or relay stations
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
- Synchronizing For Television (AREA)
Abstract
1,240,361. Automatic phase control. PYE Ltd. 23 April, 1969, No. 20745/69. Heading H3A. In a synchronizing system, a synchronizing signal from a remote point is compared with a local one, and is delayed in response to the phase difference detected to produce a residual phase error which is less than a given value, the residual phase error then being removed by a further phase control arrangement. In a first embodiment; Fig. 1, a signal from a remote station is applied at A, and is fed through two. delay networks 1 ... 9 and 10 ... 17 to a phase detector 20 where it is compared with a signal from a local generator 21 to produce an error signal which is fed to control unit 24. If the error is greater than a first reference level, switch S1 is actuated via motor M1 to insert delay until the error signal falls below the first reference level. When this occurs switch S2 is actuated via motor M2 until the error signal falls below a second reference level. The resulting residual phase error is then eliminated by a control loop in the slaving unit 25 which locks the two signals. This control loop may be of the type in which pulses are added to or subtracted from the input to a divider. In an alternative arrangement, Fig. 2 (not shown), binary delays are digitally controlled by a phase comparator of the type which counts the number of pulses from a clock source (40) which occur between local and remote synchronizing pulses (LOCAL, REM).
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2074569A GB1240361A (en) | 1969-04-23 | 1969-04-23 | Synchronising arrangements for television systems |
DE19702016245 DE2016245A1 (en) | 1969-04-23 | 1970-04-04 | |
NL7005640A NL7005640A (en) | 1969-04-23 | 1970-04-18 | |
AU14048/70A AU1404870A (en) | 1969-04-23 | 1970-04-20 | Synchronizing arrangements for television systems |
FR7014605A FR2039389A7 (en) | 1969-04-23 | 1970-04-22 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2074569A GB1240361A (en) | 1969-04-23 | 1969-04-23 | Synchronising arrangements for television systems |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1240361A true GB1240361A (en) | 1971-07-21 |
Family
ID=10150951
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2074569A Expired GB1240361A (en) | 1969-04-23 | 1969-04-23 | Synchronising arrangements for television systems |
Country Status (5)
Country | Link |
---|---|
AU (1) | AU1404870A (en) |
DE (1) | DE2016245A1 (en) |
FR (1) | FR2039389A7 (en) |
GB (1) | GB1240361A (en) |
NL (1) | NL7005640A (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5927513B2 (en) * | 1976-11-05 | 1984-07-06 | 日本テレビジヨン工業株式会社 | signal generator |
-
1969
- 1969-04-23 GB GB2074569A patent/GB1240361A/en not_active Expired
-
1970
- 1970-04-04 DE DE19702016245 patent/DE2016245A1/de active Pending
- 1970-04-18 NL NL7005640A patent/NL7005640A/xx unknown
- 1970-04-20 AU AU14048/70A patent/AU1404870A/en not_active Expired
- 1970-04-22 FR FR7014605A patent/FR2039389A7/fr not_active Expired
Also Published As
Publication number | Publication date |
---|---|
NL7005640A (en) | 1970-10-27 |
DE2016245A1 (en) | 1970-11-05 |
FR2039389A7 (en) | 1971-01-15 |
AU1404870A (en) | 1971-10-21 |
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