GB1238903A - - Google Patents
Info
- Publication number
- GB1238903A GB1238903A GB1238903DA GB1238903A GB 1238903 A GB1238903 A GB 1238903A GB 1238903D A GB1238903D A GB 1238903DA GB 1238903 A GB1238903 A GB 1238903A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- modulator
- stage
- divided
- colour television
- 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
- H04N9/00—Details of colour television systems
- H04N9/44—Colour synchronisation
- H04N9/45—Generation or recovery of colour sub-carriers
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Color Television Systems (AREA)
Abstract
1,238,903. Colour television. PYE Ltd. 14 Aug., 1969 [28 Aug., 1968], No. 41054/68. Heading H4F. A master oscillator for use with a 625 line, 50 fields per second PAL colour television system in which the relationship F H =4/1135 (F sc - ¢F v ) is satisfied, comprises an oscillator 1, Fig. 2, having a sub-carrier frequency F sc , the output of which is applied to a modulator 2 to which is also applied a signal of frequency Fv/2 (see below). The output of modulator 2 is filtered 3 and the resulting difference frequency (F sc - ¢F v ) is multiplied by 2 and applied directly and via a divide by 5 stage 10 to the inputs of a second modulator 11 the difference output 8/5(F sc - ¢F v ) being filtered 12 and divided by 227 in stage 13 to derive frequency 2F H . This is divided by 2 to form line frequency f H and divided by 625 to derive field frequency # v . Frequency F v is divided by 2 in stage 8 and applied to modulator 2 are previously described. Frequencies F sc , 2F H , F H and F v are applied to a synchronizing pulse generator of a PAL colour television system. If the " - ¢F v " offset is not required, modulator 2, filter 3 and divider 8 are not required. In addition for a 525 line, 60 fields per second colour television system stage 13 divides by 91 and stage 7 by 525.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB4105468 | 1968-08-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1238903A true GB1238903A (en) | 1971-07-14 |
Family
ID=10417891
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1238903D Expired GB1238903A (en) | 1968-08-28 | 1968-08-28 |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1238903A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0175434A2 (en) * | 1984-04-27 | 1986-03-26 | Ampex Corporation | Apparatus for generating television synchronizing signals |
-
1968
- 1968-08-28 GB GB1238903D patent/GB1238903A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0175434A2 (en) * | 1984-04-27 | 1986-03-26 | Ampex Corporation | Apparatus for generating television synchronizing signals |
EP0175434A3 (en) * | 1984-04-27 | 1988-09-28 | Ampex Corporation | Method and apparatus for generating television synchronizing signals |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |